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---
version: tip
layout: manpage_v2
title: nng_free(3)
---
<h1>nng_free(3)</h1>
<div class="sect1">
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<div class="paragraph">
<p>nng_free - free memory</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<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"><nng/nng.h></span>
<span class="tok-kt">void</span><span class="tok-w"> </span><span class="tok-nf">nng_free</span><span class="tok-p">(</span><span class="tok-kt">void</span><span class="tok-w"> </span><span class="tok-o">*</span><span class="tok-n">ptr</span><span class="tok-p">,</span><span class="tok-w"> </span><span class="tok-kt">size_t</span><span class="tok-w"> </span><span class="tok-n">size</span><span class="tok-p">);</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <code>nng_free()</code> function deallocates a memory region of size <em>size</em>,
that was previously allocated by <a href="nng_alloc.3.html"><code>nng_alloc()</code></a> or
<a href="nng_recv.3.html"><code>nng_recv()</code></a> with the <code>NNG_FLAG_ALLOC</code> flag.</p>
</div>
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<i class="fa icon-important" title="Important"></i>
</td>
<td class="content">
It is very important that <em>size</em> match the allocation size
used to allocate the memory.
</td>
</tr>
</table>
</div>
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<i class="fa icon-important" title="Important"></i>
</td>
<td class="content">
Do not attempt to use this function to deallocate memory
obtained by a call to the system <code>malloc()</code> or <code>calloc()</code> functions,
or the C++ <code>new</code> operator.
Doing so may result in unpredictable
behavior, including corruption of application memory.
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_return_values">RETURN VALUES</h2>
<div class="sectionbody">
<div class="paragraph">
<p>None.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_errors">ERRORS</h2>
<div class="sectionbody">
<div class="paragraph">
<p>None.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph text-left">
<p><a href="nng_alloc.3.html">nng_alloc(3)</a>,
<a href="nng_recv.3.html">nng_recv(3)</a>,
<a href="nng.7.html">nng(7)</a></p>
</div>
</div>
</div>
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