man/tip/nng_socket_id.3.html


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---
version: tip
layout: manpage_v2
title: nng_socket_id(3)
---
<h1>nng_socket_id(3)</h1>
<div class="sect1">
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<div class="paragraph">
<p>nng_socket_id - return numeric socket identifier</p>
</div>
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</div>
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="listingblock">
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<pre class="pygments highlight"><code data-lang="c"><span></span><span class="tok-cp">#include</span><span class="tok-w"> </span><span class="tok-cpf">&lt;nng/nng.h&gt;</span>

<span class="tok-kt">int</span><span class="tok-w"> </span><span class="tok-nf">nng_socket_id</span><span class="tok-p">(</span><span class="tok-n">nng_socket</span><span class="tok-w"> </span><span class="tok-n">s</span><span class="tok-p">);</span></code></pre>
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</div>
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<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <code>nng_socket_id()</code> function returns a positive identifier for the socket <em>s</em>,
if it is valid.
Otherwise it returns <code>-1</code>.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
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<td class="content">
A socket is considered valid if it was ever opened with a protocol
constructor, such as the <a href="nng_req_open.3.html"><code>nng_req0_open()</code></a> function.
Sockets that are allocated on the stack or statically should be
initialized with the macro
<a href="nng_socket.5.html#NNG_SOCKET_INITIALIZER"><code>NNG_SOCKET_INITIALIZER</code></a>
to ensure that they cannot be confused with a valid socket before they are opened.
</td>
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<div class="sect1">
<h2 id="_return_values">RETURN VALUES</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This function returns the positive value for the socket identifier, or
<code>-1</code> if the socket is invalid.</p>
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<div class="sect1">
<h2 id="_errors">ERRORS</h2>
<div class="sectionbody">
<div class="paragraph">
<p>None.</p>
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<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph text-left">
<p><a href="nng_socket.5.html">nng_socket(5)</a>,
<a href="nng.7.html">nng(7)</a></p>
</div>
</div>
</div>