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+---
+version: v1.3.2
+layout: manpage_v2
+---
+<h1>nng_msg_append(3)</h1>
+<div class="sect1">
+<h2 id="_name">NAME</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>nng_msg_append - append to message body</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 class="tok-cp">#include</span> <span class="tok-cpf">&lt;nng/nng.h&gt;</span><span class="tok-cp">
+</span><span class="tok-cp"></span>
+<span class="tok-kt">int</span> <span class="tok-nf">nng_msg_append</span><span class="tok-p">(</span><span class="tok-n">nng_msg</span> <span class="tok-o">*</span><span class="tok-n">msg</span><span class="tok-p">,</span> <span class="tok-k">const</span> <span class="tok-kt">void</span> <span class="tok-o">*</span><span class="tok-n">val</span><span class="tok-p">,</span> <span class="tok-n">size_t</span> <span class="tok-n">size</span><span class="tok-p">);</span>
+<span class="tok-kt">int</span> <span class="tok-nf">nng_msg_append_u16</span><span class="tok-p">(</span><span class="tok-n">nng_msg</span> <span class="tok-o">*</span><span class="tok-n">msg</span><span class="tok-p">,</span> <span class="tok-n">uint16_t</span> <span class="tok-n">val16</span><span class="tok-p">);</span>
+<span class="tok-kt">int</span> <span class="tok-nf">nng_msg_append_u32</span><span class="tok-p">(</span><span class="tok-n">nng_msg</span> <span class="tok-o">*</span><span class="tok-n">msg</span><span class="tok-p">,</span> <span class="tok-n">uint32_t</span> <span class="tok-n">val32</span><span class="tok-p">);</span>
+<span class="tok-kt">int</span> <span class="tok-nf">nng_msg_append_u64</span><span class="tok-p">(</span><span class="tok-n">nng_msg</span> <span class="tok-o">*</span><span class="tok-n">msg</span><span class="tok-p">,</span> <span class="tok-n">uint64_t</span> <span class="tok-n">val64</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_msg_append()</code> family of functions appends data to
+the end of the body of message <em>msg</em>, reallocating it if necessary.
+The first function appends <em>size</em> bytes, copying them from <em>val</em>.
+The remaining functions append the value specified (such as <em>val32</em>) in
+network-byte order (big-endian).</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_return_values">RETURN VALUES</h2>
+<div class="sectionbody">
+<div class="paragraph">
+<p>These functions return 0 on success, and non-zero otherwise.</p>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_errors">ERRORS</h2>
+<div class="sectionbody">
+<div class="hdlist">
+<table>
+<tr>
+<td class="hdlist1">
+<code>NNG_ENOMEM</code>
+</td>
+<td class="hdlist2">
+<p>Insufficient free memory exists.</p>
+</td>
+</tr>
+</table>
+</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_msg_alloc.3.html">nng_msg_alloc(3)</a>,
+<a href="nng_msg_body.3.html">nng_msg_body(3)</a>,
+<a href="nng_msg_chop.3.html">nng_msg_chop(3)</a>,
+<a href="nng_msg_free.3.html">nng_msg_free(3)</a>,
+<a href="nng_msg_insert.3.html">nng_msg_insert(3)</a>,
+<a href="nng_msg_len.3.html">nng_msg_len(3)</a>,
+<a href="nng_msg_realloc.3.html">nng_msg_realloc(3)</a>,
+<a href="nng_msg_trim.3.html">nng_msg_trim(3)</a>,
+<a href="nng_strerror.3.html">nng_strerror(3)</a>,
+<a href="nng_msg.5.html">nng_msg(5)</a>,
+<a href="nng.7.html">nng(7)</a></p>
+</div>
+</div>
+</div>