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<h1>nng_msg_header_append(3) Manual Page</h1>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_synopsis">SYNOPSIS</a></li>
<li><a href="#_description">DESCRIPTION</a></li>
<li><a href="#_return_values">RETURN VALUES</a></li>
<li><a href="#_errors">ERRORS</a></li>
<li><a href="#_see_also">SEE ALSO</a></li>
</ul>
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<h2 id="_name">NAME</h2>
<div class="sectionbody">
<p>nng_msg_header_append - append to message header</p>
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<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
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<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-cpf"><nng/nng.h></span><span class="tok-cp"></span>
<span class="tok-kt">int</span> <span class="tok-nf">nng_msg_header_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-kt">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_header_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-kt">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_header_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-kt">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_header_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-kt">uint64_t</span> <span class="tok-n">val64</span><span class="tok-p">);</span></code></pre>
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<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <code>nng_msg_header_append()</code> family of functions appends data to
the end of the headers of message <em>msg</em>, reallocating it if necessary.
The first function appends <em>size</em> bytes, copying them from <em>val</em>.</p>
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<div class="paragraph">
<p>The remaining functions append the value (such as <em>val32</em>) in
network-byte order (big-endian).</p>
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<div class="sect1">
<h2 id="_return_values">RETURN VALUES</h2>
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<div class="paragraph">
<p>These functions return 0 on success, and non-zero otherwise.</p>
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<div class="sect1">
<h2 id="_errors">ERRORS</h2>
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<div class="hdlist">
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<td class="hdlist1">
<code>NNG_ENOMEM</code>
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<td class="hdlist2">
<p>Insufficient free memory exists.</p>
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</tr>
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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_msg_alloc.3.html">nng_msg_alloc(3)</a>,
<a href="nng_msg_header.3.html">nng_msg_header(3)</a>,
<a href="nng_msg_header_chop.3.html">nng_msg_header_chop(3)</a>,
<a href="nng_msg_header_insert.3.html">nng_msg_header_insert(3)</a>,
<a href="nng_msg_header_len.3.html">nng_msg_header_len(3)</a>,
<a href="nng_msg_header_trim.3.html">nng_msg_header_trim(3)</a>,
<a href="nng_msg_free.3.html">nng_msg_free(3)</a>,
<a href="nng_strerror.3.html">nng_strerror(3)</a>,
<a href="nng.7.html">nng(7)</a></p>
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