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<h1 class="lined-header"><span>ranch:handshake(3)</span></h1>
<h2 id="_name">Name</h2>
<p>ranch:handshake - Perform the transport handshake</p>
<h2 id="_description">Description</h2>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000000">handshake</font></b>(<font color="#009900">Ref</font>) <font color="#990000">-></font> <b><font color="#000000">handshake</font></b>(<font color="#009900">Ref</font>, [])
<b><font color="#000000">handshake</font></b>(<font color="#009900">Ref</font>, <font color="#009900">Opts</font>) <font color="#990000">-></font> {<font color="#FF6600">ok</font>, <font color="#009900">Socket</font>}
<font color="#009900">Ref</font> <font color="#990000">::</font> <b><font color="#000000">ranch:ref</font></b>()
<font color="#009900">Opts</font> <font color="#990000">::</font> <b><font color="#000000">any</font></b>()
<font color="#009900">Socket</font> <font color="#990000">::</font> <b><font color="#000000">any</font></b>()</tt></pre>
</div></div>
<p>Perform the transport handshake.</p>
<p>This function must be called by the protocol process in order to retrieve the socket for the connection. Ranch performs the handshake necessary to give control of the socket to this process and also does the transport handshake, for example setting up the TLS connection.</p>
<p>Currently the socket can be obtained from a <code>Protocol:start_link/4</code> argument and as a return value from <code>ranch:handshake/1,2</code>. In Ranch 2.0 the socket will only be available from <code>ranch:handshake/1,2</code>.</p>
<h2 id="_arguments">Arguments</h2>
<dl><dt>Ref</dt>
<dd><p>The listener name.</p>
</dd>
<dt>Opts</dt>
<dd><p>Transport handshake options.</p>
<p>Allowed options depend on the transport module.</p>
</dd>
</dl>
<h2 id="_return_value">Return value</h2>
<p>An <code>ok</code> tuple is returned containing the socket for the connection.</p>
<p>This function will trigger an exception when an error occurs.</p>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>1.6</strong>: Function introduced. Replaces <code>ranch:accept_ack/1</code>.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Initialize the connection process</div>
<div class="content"><!-- Generator: GNU source-highlight 3.1.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000000">start_link</font></b>(<font color="#009900">Ref</font>, <font color="#990000">_</font>, <font color="#009900">Transport</font>, <font color="#009900">Opts</font>) <font color="#990000">-></font>
<font color="#009900">Pid</font> <font color="#990000">=</font> <b><font color="#000000">proc_lib:spawn_link</font></b>(<b><font color="#000080">?MODULE</font></b>, <font color="#FF6600">init</font>,
[<font color="#009900">Ref</font>, <font color="#009900">Transport</font>, <font color="#009900">Opts</font>]),
{<font color="#FF6600">ok</font>, <font color="#009900">Pid</font>}<font color="#990000">.</font>
<b><font color="#000000">init</font></b>(<font color="#009900">Ref</font>, <font color="#009900">Transport</font>, <font color="#009900">Opts</font>) <font color="#990000">-></font>
{<font color="#FF6600">ok</font>, <font color="#009900">Socket</font>} <font color="#990000">=</font> <b><font color="#000000">ranch:handshake</font></b>(<font color="#009900">Ref</font>),
<b><font color="#000000">loop</font></b>(<font color="#008080">#state</font>{<font color="#0000FF">ref</font><font color="#990000">=</font><font color="#009900">Ref</font>, <font color="#0000FF">socket</font><font color="#990000">=</font><font color="#009900">Socket</font>,
<font color="#0000FF">transport</font><font color="#990000">=</font><font color="#009900">Transport</font>, <font color="#0000FF">opts</font><font color="#990000">=</font><font color="#009900">Opts</font>})<font color="#990000">.</font></tt></pre>
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<h2 id="_see_also">See also</h2>
<p><a href="../ranch.start_listener">ranch:start_listener(3)</a>, <a href="../ranch.recv_proxy_header">ranch:recv_proxy_header(3)</a>, <a href="../ranch.remove_connection">ranch:remove_connection(3)</a>, <a href="../ranch">ranch(3)</a></p>
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<h3>
Ranch
1.8
Function Reference
</h3>
<ul>
<li><a href="/docs/en/ranch/1.8/guide">User Guide</a></li>
<li><a href="/docs/en/ranch/1.8/manual">Function Reference</a></li>
</ul>
<h4 id="docs-nav">Navigation</h4>
<h4>Version select</h4>
<ul>
<li><a href="/docs/en/ranch/2.0/manual">2.0</a></li>
<li><a href="/docs/en/ranch/1.8/manual">1.8</a></li>
<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>
</ul>
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