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Rename

<!DOCTYPE html SYSTEM "about:legacy-compat">
<html lang="en"><head><META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta content="width=device-width, initial-scale=1" name="viewport">

<title>mod_so - Apache HTTP Server Version 2.4</title>
<link href="../../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet">
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<p>On selected operating systems this module can be used to
    load modules into Apache HTTP Server at runtime via the <a href="../dso.html">Dynamic Shared Object</a> (DSO) mechanism,
    rather than requiring a recompilation.</p>

<p>On Unix, the loaded code typically comes from shared object
    files (usually with <code>.so</code> extension), on Windows
    this may either be the <code>.so</code> or <code>.dll</code>
    extension.</p>

<div class="warning"><h3>Warning</h3>
    <p>Modules built for one major version of the Apache HTTP Server
    will generally not work on another. (e.g. 1.3 vs. 2.0, or 2.0 vs.
    2.2) There are usually API changes between one major version and
    another that require that modules be modified to work with the new
    version.</p>
    </div>
</div>
<div id="quickview"><h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../../images/down.gif"> <a href="#windows">Creating Loadable Modules for Windows</a></li>
</ul><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../../images/down.gif"> <a href="#loadfile">LoadFile</a></li>
<li><img alt="" src="../../images/down.gif"> <a href="#loadmodule">LoadModule</a></li>
</ul>
<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_so">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_so">Report a bug</a></li></ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../../images/up.gif"></a></div>
<div class="section">
<h2 id="windows">Creating Loadable Modules for Windows <a title="Permanent link" href="#windows" class="permalink">&para;</a></h2>

<div class="note"><h3>Note</h3>
    <p>On Windows, where loadable files typically have a file extension
    of <code>.dll</code>, Apache httpd modules are called
    <code>mod_whatever.so</code>, just as they are on other platforms.
    However, you may encounter third-party modules, such as PHP for
    example, that continue to use the <code>.dll</code> convention.</p>

<p>While <code>mod_so</code> still loads modules with
    <code>ApacheModuleFoo.dll</code> names, the new naming convention is
    preferred; if you are converting your loadable module for 2.0,
    please fix the name to this 2.0 convention.</p></div>

<p>The Apache httpd module API is unchanged between the Unix and
    Windows versions. Many modules will run on Windows with no or
    little change from Unix, although others rely on aspects of the
    Unix architecture which are not present in Windows, and will
    not work.</p>

<p>When a module does work, it can be added to the server in
    one of two ways. As with Unix, it can be compiled into the
    server. Because Apache httpd for Windows does not have the
    <code>Configure</code> program of Apache httpd for Unix, the module's
    source file must be added to the ApacheCore project file, and
    its symbols must be added to the
    <code>os\win32\modules.c</code> file.</p>

<p>The second way is to compile the module as a DLL, a shared
    library that can be loaded into the server at runtime, using
    the <code class="directive">LoadModule</code>
    directive. These module DLLs can be distributed and run on any
    Apache httpd for Windows installation, without recompilation of the
    server.</p>

<p>To create a module DLL, a small change is necessary to the
    module's source file: The module record must be exported from
    the DLL (which will be created later; see below). To do this,
    add the <code>AP_MODULE_DECLARE_DATA</code> (defined in the
    Apache httpd header files) to your module's module record definition.
    For example, if your module has:</p>

<div class="example"><p><code>
    module foo_module;
</code></p></div>

<p>Replace the above with:</p>
<div class="example"><p><code>
    module AP_MODULE_DECLARE_DATA foo_module;
</code></p></div>

<p>Note that this will only be activated on Windows, so the
    module can continue to be used, unchanged, with Unix if needed.
    Also, if you are familiar with <code>.DEF</code> files, you can
    export the module record with that method instead.</p>

<p>Now, create a DLL containing your module. You will need to
    link this against the libhttpd.lib export library that is
    created when the libhttpd.dll shared library is compiled. You
    may also have to change the compiler settings to ensure that
    the Apache httpd header files are correctly located. You can find
    this library in your server root's modules directory. It is
    best to grab an existing module .dsp file from the tree to
    assure the build environment is configured correctly, or
    alternately compare the compiler and link options to your
    .dsp.</p>

<p>This should create a DLL version of your module. Now simply
    place it in the <code>modules</code> directory of your server
    root, and use the <code class="directive">LoadModule</code>
    directive to load it.</p>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../../images/up.gif"></a></div>
<div class="directive-section"><h2 id="loadfile"><span id="LoadFile">LoadFile</span> Directive <a title="Permanent link" href="#loadfile" class="permalink">&para;</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Link in the named object file or library</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LoadFile <em>filename</em> [<em>filename</em>] ...</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_so</td></tr>
</table>

<p>The <code class="directive">LoadFile</code> directive links in the named object files or
    libraries when the server is started or restarted; this is used
    to load additional code which may be required for some module
    to work. <em>Filename</em> is either an absolute path or
    relative to <a href="core.html#serverroot">ServerRoot</a>.</p>

<p>For example:</p>

<pre class="prettyprint lang-config">LoadFile "libexec/libxmlparse.so"</pre>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../../images/up.gif"></a></div>
<div class="directive-section"><h2 id="loadmodule"><span id="LoadModule">LoadModule</span> Directive <a title="Permanent link" href="#loadmodule" class="permalink">&para;</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Links in the object file or library, and adds to the list
of active modules</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LoadModule <em>module filename</em></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_so</td></tr>
</table>
    <p>The <code class="directive">LoadModule</code> directive links in the object file or library
    <em>filename</em> and adds the module structure named
    <em>module</em> to the list of active modules. <em>Module</em>
    is the name of the external variable of type
    <code>module</code> in the file, and is listed as the <a href="module-dict.html#ModuleIdentifier">Module Identifier</a>
    in the module documentation.</p>

<p>For example:</p>

<pre class="prettyprint lang-config">LoadModule status_module "modules/mod_status.so"</pre>

<p>loads the named module from the modules subdirectory of the
    ServerRoot.</p>

</div>
</div>
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