<?xml version="1.0"?>
<!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
<?xml-stylesheet type="text/xsl" href="../style/manual.en.xsl"?>
<!-- $LastChangedRevision$ -->

<!--
 Licensed to the Apache Software Foundation (ASF) under one or more
 contributor license agreements.  See the NOTICE file distributed with
 this work for additional information regarding copyright ownership.
 The ASF licenses this file to You under the Apache License, Version 2.0
 (the "License"); you may not use this file except in compliance with
 the License.  You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-->

<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>
