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<?xml version="1.0"?>
<!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
<?xml-stylesheet type="text/xsl" href="../style/manual.en.xsl"?>
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<modulesynopsis metafile="mod_proxy_fdpass.xml.meta">
<name>mod_proxy_fdpass</name>
<description>fdpass external process support module for
<module>mod_proxy</module></description>
<status>Extension</status>
<sourcefile>mod_proxy_fdpass.c</sourcefile>
<identifier>proxy_fdpass_module</identifier>
<compatibility>Available for unix in version 2.3 and later</compatibility>
<summary>
<p>This module <em>requires</em> the service of <module
>mod_proxy</module>. It provides support for the passing the socket of the
client to another process.</p>
<p><code>mod_proxy_fdpass</code> uses the ability of AF_UNIX domain
sockets to <a href="http://www.freebsd.org/cgi/man.cgi?query=recv">pass an
open file descriptor</a> to allow another process to finish handling a request.
</p>
<p>The module has a <code>proxy_fdpass_flusher</code> provider interface,
which allows another module to optionally send the response headers, or even
the start of the response body. The default flush provider disables keep-alive,
and sends the response headers, letting the external process just send a
response body.</p>
<p>At this time the only data passed to the external process is the client
socket. To receive a client socket, call recvfrom with an allocated
<a href="http://www.kernel.org/doc/man-pages/online/pages/man3/cmsg.3.html"
><code>struct cmsghdr</code></a>. Future versions of this module may include
more data after the client socket, but this is not implemented at this time.
</p>
</summary>
<seealso><module>mod_proxy</module></seealso>
</modulesynopsis>
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