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  <section id="vext-varnish-extensions">
<span id="ref-vext"></span><h1>VEXT - Varnish Extensions<a class="headerlink" href="#vext-varnish-extensions" title="Link to this heading">¶</a></h1>
<p>A Varnish Extension is a shared library, loaded into the worker
process during startup, before privilges are dropped for good.  This
allows a VEXT to do pretty much anything it wants to do in the
worker process.</p>
<p>A VEXT can (also) contain a VMOD, and it will work just like any
other VMOD, which also means that VMODs can be loaded as VEXTs.</p>
<p>The VEXTs are loaded in the child process, in the order they are
specified on the commandline, after the <code class="docutils literal notranslate"><span class="pre">heritage</span></code> has been
established, but before stevedores are initialized and jail
privileges are dropped.</p>
<p>There is currently no <code class="docutils literal notranslate"><span class="pre">init</span></code> entrypoint defined, but a
VEXT can use a static initializer to get activated on loading.</p>
<p>If those static initializers want to bail out, <code class="docutils literal notranslate"><span class="pre">stderr</span></code> and
<code class="docutils literal notranslate"><span class="pre">exit(3)</span></code> can be used to convey diagnostics.</p>
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