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<!DOCTYPE html> <html lang="en" data-content_root="../"> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="viewport" content="width=device-width, initial-scale=1" /> <title>VEXT - Varnish Extensions — Varnish version 7.5.0 documentation</title> <link rel="stylesheet" type="text/css" href="../_static/pygments.css?v=fa44fd50" /> <link rel="stylesheet" type="text/css" href="../_static/classic.css?v=e2714048" /> <script src="../_static/documentation_options.js?v=8214db13"></script> <script src="../_static/doctools.js?v=888ff710"></script> <script src="../_static/sphinx_highlight.js?v=dc90522c"></script> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="next" title="VSM: Shared Memory Logging and Statistics" href="vsm.html" /> <link rel="prev" title="VMOD - Varnish Modules" href="vmod.html" /> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="vsm.html" title="VSM: Shared Memory Logging and Statistics" accesskey="N">next</a> |</li> <li class="right" > <a href="vmod.html" title="VMOD - Varnish Modules" accesskey="P">previous</a> |</li> <li class="nav-item nav-item-0"><a href="../index.html">Varnish version 7.5.0 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="index.html" accesskey="U">The Varnish Reference Manual</a> »</li> <li class="nav-item nav-item-this"><a href="">VEXT - Varnish Extensions</a></li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <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">ΒΆ</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> </section> <div class="clearer"></div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <div> <h4>Previous topic</h4> <p class="topless"><a href="vmod.html" title="previous chapter">VMOD - Varnish Modules</a></p> </div> <div> <h4>Next topic</h4> <p class="topless"><a href="vsm.html" title="next chapter">VSM: Shared Memory Logging and Statistics</a></p> </div> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/reference/vext.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3 id="searchlabel">Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" aria-labelledby="searchlabel" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"/> <input type="submit" value="Go" /> </form> </div> </div> <script>document.getElementById('searchbox').style.display = "block"</script> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="vsm.html" title="VSM: Shared Memory Logging and Statistics" >next</a> |</li> <li class="right" > <a href="vmod.html" title="VMOD - Varnish Modules" >previous</a> |</li> <li class="nav-item nav-item-0"><a href="../index.html">Varnish version 7.5.0 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="index.html" >The Varnish Reference Manual</a> »</li> <li class="nav-item nav-item-this"><a href="">VEXT - Varnish Extensions</a></li> </ul> </div> <div class="footer" role="contentinfo"> © Copyright 2010-2014, Varnish Software AS. 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