<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="">
<meta name="author" content="Loïc Hoguin based on a design from (Soft10) Pol Cámara">
<title>Nine Nines: ranch:child_spec(3)</title>
<link href='https://fonts.googleapis.com/css?family=Open+Sans:400,700,400italic' rel='stylesheet' type='text/css'>
<link href="/css/99s.css?r=2" rel="stylesheet">
<link rel="shortcut icon" href="/img/ico/favicon.ico">
<link rel="apple-touch-icon-precomposed" sizes="114x114" href="/img/ico/apple-touch-icon-114.png">
<link rel="apple-touch-icon-precomposed" sizes="72x72" href="/img/ico/apple-touch-icon-72.png">
<link rel="apple-touch-icon-precomposed" href="/img/ico/apple-touch-icon-57.png">
</head>
<body class="">
<header id="page-head">
<div id="topbar" class="container">
<div class="row">
<div class="span2">
<h1 id="logo"><a href="/" title="99s">99s</a></h1>
</div>
<div class="span10">
<div id="side-header">
<nav>
<ul>
<li><a title="Hear my thoughts" href="/articles">Articles</a></li>
<li><a title="Watch my talks" href="/talks">Talks</a></li>
<li class="active"><a title="Read the docs" href="/docs">Documentation</a></li>
<li><a title="Request my services" href="/services">Consulting & Training</a></li>
</ul>
</nav>
<ul id="social">
<li>
<a href="https://github.com/ninenines" title="Check my Github repositories"><img src="/img/ico_github.png" data-hover="/img/ico_github_alt.png" alt="Github"></a>
</li>
<li>
<a title="Contact me" href="mailto:[email protected]"><img src="/img/ico_mail.png" data-hover="/img/ico_mail_alt.png"></a>
</li>
</ul>
</div>
</div>
</div>
</div>
</header>
<div id="contents" class="two_col">
<div class="container">
<div class="row">
<div id="docs" class="span9 maincol">
<h1 class="lined-header"><span>ranch:child_spec(3)</span></h1>
<h2 id="_name">Name</h2>
<p>ranch:child_spec - Build child specifications for a new listener</p>
<h2 id="_description">Description</h2>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000000">child_spec</font></b>(<font color="#009900">Ref</font> <font color="#990000">::</font> <b><font color="#000000">ranch_ref</font></b>(),
<font color="#009900">Transport</font> <font color="#990000">::</font> <b><font color="#000000">module</font></b>(),
<font color="#009900">TransOpts</font> <font color="#990000">::</font> <b><font color="#000000">ranch:opts</font></b>(),
<font color="#009900">Protocol</font> <font color="#990000">::</font> <b><font color="#000000">module</font></b>(),
<font color="#009900">ProtoOpts</font> <font color="#990000">::</font> <b><font color="#000000">any</font></b>())
<font color="#990000">-></font> <b><font color="#000000">supervisor:child_spec</font></b>()</tt></pre>
</div></div>
<p>Build child specifications for a new listener.</p>
<p>This function can be used to embed a listener directly in an application's supervision tree.</p>
<h2 id="_arguments">Arguments</h2>
<dl><dt>Ref</dt>
<dd><p>The listener name is used to refer to this listener in future calls, for example when stopping it or when updating the configuration.</p>
<p>It can be any Erlang term. An atom is generally good enough, for example <code>api</code>, <code>my_app_clear</code> or <code>my_app_tls</code>.</p>
</dd>
<dt>Transport</dt>
<dd><p>The transport module that will be used by Ranch to accept connections and that will be passed to the protocol module along with the socket.</p>
<p>The interface of the transport module is documented in the <a href="../ranch_transport">ranch_transport(3)</a> manual.</p>
</dd>
<dt>TransportOpts</dt>
<dd><p>Transport options include the Ranch-specific options and the socket options. The listener's port number must be defined in the socket options.</p>
<p>Socket options may be given directly if there are no Ranch-specific options.</p>
<p>The available options for the built-in Ranch transports are documented in the <a href="../ranch_tcp">ranch_tcp(3)</a> and <a href="../ranch_ssl">ranch_ssl(3)</a> manuals.</p>
</dd>
<dt>Protocol</dt>
<dd><p>The protocol module that will be used by Ranch after the connection has been accepted.</p>
<p>The interface of the protocol module is documented in the <a href="../ranch_protocol">ranch_protocol(3)</a> manual.</p>
</dd>
<dt>ProtocolOpts</dt>
<dd><p>The protocol options given when calling the protocol module. Please consult the documentation of the protocol module you are using for more details.</p>
</dd>
</dl>
<h2 id="_return_value">Return value</h2>
<p>Child specifications are returned.</p>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>1.4</strong>: The <code>NumAcceptors</code> argument was moved to the transport options.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Embed a listener</div>
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000080">-behavior</font></b>(<font color="#FF6600">supervisor</font>)<font color="#990000">.</font>
<b><font color="#000000">init</font></b>(<font color="#990000">_</font>) <font color="#990000">-></font>
{<font color="#FF6600">ok</font>, {#{<font color="#0000FF">strategy</font> <font color="#990000">=></font> <font color="#FF6600">one_for_one</font>}, [
<b><font color="#000000">ranch:child_spec</font></b>(<font color="#FF6600">echo</font>,
<font color="#FF6600">ranch_tcp</font>, [{<font color="#FF6600">port</font>, <font color="#993399">5555</font>}],
<font color="#FF6600">echo_protocol</font>, []
)
]}}<font color="#990000">.</font></tt></pre>
</div></div>
<h2 id="_see_also">See also</h2>
<p><a href="../ranch.start_listener">ranch:start_listener(3)</a>, <a href="../ranch.stop_listener">ranch:stop_listener(3)</a>, <a href="../ranch">ranch(3)</a>, <a href="../ranch_tcp">ranch_tcp(3)</a>, <a href="../ranch_ssl">ranch_ssl(3)</a>, <a href="../ranch_transport">ranch_transport(3)</a>, <a href="../ranch_protocol">ranch_protocol(3)</a></p>
</div>
<div class="span3 sidecol">
<h3>
Ranch
1.6
Function Reference
</h3>
<ul>
<li><a href="/docs/en/ranch/1.6/guide">User Guide</a></li>
<li><a href="/docs/en/ranch/1.6/manual">Function Reference</a></li>
</ul>
<h4 id="docs-nav">Navigation</h4>
<h4>Version select</h4>
<ul>
<li><a href="/docs/en/ranch/1.7/manual">1.7</a></li>
<li><a href="/docs/en/ranch/1.6/manual">1.6</a></li>
<li><a href="/docs/en/ranch/1.5/manual">1.5</a></li>
<li><a href="/docs/en/ranch/1.4/manual">1.4</a></li>
<li><a href="/docs/en/ranch/1.3/manual">1.3</a></li>
<li><a href="/docs/en/ranch/1.2/manual">1.2</a></li>
</ul>
</div>
</div>
</div>
</div>
<footer>
<div class="container">
<div class="row">
<div class="span6">
<p id="scroll-top"><a href="#">↑ Scroll to top</a></p>
<nav>
<ul>
<li><a href="mailto:[email protected]" title="Contact us">Contact us</a></li><li><a href="https://github.com/ninenines/ninenines.github.io" title="Github repository">Contribute to this site</a></li>
</ul>
</nav>
</div>
<div class="span6 credits">
<p><img src="/img/footer_logo.png"></p>
<p>Copyright © Loïc Hoguin 2012-2018</p>
</div>
</div>
</div>
</footer>
<script src="/js/custom.js"></script>
</body>
</html>
