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  <section id="using-inline-c-to-extend-varnish">
<h1>Using inline C to extend Varnish<a class="headerlink" href="#using-inline-c-to-extend-varnish" title="Link to this heading">¶</a></h1>
<p>(Here there be dragons. Big and mean ones.)</p>
<p>You can use <em>inline C</em> to extend Varnish. Please note that you can
seriously mess up Varnish this way. The C code runs within the Varnish
Cache process so if your code generates a segfault the cache will crash.</p>
<p>One of the first uses of inline C was logging to <cite>syslog</cite>.:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># The include statements must be outside the subroutines.</span>
<span class="n">C</span><span class="p">{</span>
        <span class="c1">#include &lt;syslog.h&gt;</span>
<span class="p">}</span><span class="n">C</span>

<span class="n">sub</span> <span class="n">vcl_something</span> <span class="p">{</span>
        <span class="n">C</span><span class="p">{</span>
                <span class="n">syslog</span><span class="p">(</span><span class="n">LOG_INFO</span><span class="p">,</span> <span class="s2">&quot;Something happened at VCL line XX.&quot;</span><span class="p">);</span>
        <span class="p">}</span><span class="n">C</span>
<span class="p">}</span>
</pre></div>
</div>
<p>To use inline C you need to enable it with the <code class="docutils literal notranslate"><span class="pre">vcc_allow_inline_c</span></code>
parameter.</p>
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