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<title>Apache module mod_so</title>
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<h3>Apache HTTP Server Version 1.3</h3>
</div>
<h1 align="CENTER">Module mod_so</h1>
<p>This module provides for loading of executable code and
modules into the server at start-up or restart time.</p>
<p><a href="module-dict.html#Status"
rel="Help"><strong>Status:</strong></a> Base (Windows);
Experimental (Unix)<br />
<a href="module-dict.html#SourceFile"
rel="Help"><strong>Source File:</strong></a> mod_so.c<br />
<a href="module-dict.html#ModuleIdentifier"
rel="Help"><strong>Module Identifier:</strong></a>
so_module<br />
<a href="module-dict.html#Compatibility"
rel="Help"><strong>Compatibility:</strong></a> Available in
Apache 1.3 and later.</p>
<h2>Summary</h2>
<p>This is an experimental module. On selected operating
systems it can be used to load modules into Apache 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 <samp>.so</samp> extension), whilst on
Windows this module loads <samp>DLL</samp> files. This module
is only available in Apache 1.3 and up.</p>
<p>In previous releases, the functionality of this module was
provided for Unix by mod_dld, and for Windows by mod_dll. On
Windows, mod_dll was used in beta release 1.3b1 through 1.3b5.
mod_so combines these two modules into a single module for all
operating systems.</p>
<h2>Directives</h2>
<ul>
<li><a href="#loadfile">LoadFile</a></li>
<li><a href="#loadmodule">LoadModule</a></li>
</ul>
<h2><a id="creating" name="creating">Creating DLL Modules for
Windows</a></h2>
<p>The Apache 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 for Windows does not have the
<code>Configure</code> program of Apache 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><a href="#loadmodule">LoadModule</a></code>
directive. These module DLLs can be distributed and run on any
Apache 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>MODULE_VAR_EXPORT</code> (defined in the Apache
header files) to your module's module record definition. For
example, if your module has:</p>
<pre>
module foo_module;
</pre>
<p>Replace the above with:</p>
<pre>
module MODULE_VAR_EXPORT foo_module;
</pre>
<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 ApacheCore.lib export library that is
created when the ApacheCore.dll shared library is compiled. You
may also have to change the compiler settings to ensure that
the Apache header files are correctly located.</p>
<p>This should create a DLL version of your module. Now simply
place it in the <samp>modules</samp> directory of your server
root, and use the <code><a
href="#loadmodule">LoadModule</a></code> directive to load
it.</p>
<hr />
<h2><a id="loadfile" name="loadfile">LoadFile</a>
directive</h2>
<a href="directive-dict.html#Syntax"
rel="Help"><strong>Syntax:</strong></a> LoadFile
<em>filename</em> [<em>filename</em>] ...<br />
<a href="directive-dict.html#Context"
rel="Help"><strong>Context:</strong></a> server config<br />
<a href="directive-dict.html#Status"
rel="Help"><strong>Status:</strong></a> Base<br />
<a href="directive-dict.html#Module"
rel="Help"><strong>Module:</strong></a> mod_so
<p>The LoadFile 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>
<code>LoadFile libexec/libxmlparse.so</code>
<hr />
<h2><a id="loadmodule" name="loadmodule">LoadModule</a>
directive</h2>
<a href="directive-dict.html#Syntax"
rel="Help"><strong>Syntax:</strong></a> LoadModule <em>module
filename</em><br />
<a href="directive-dict.html#Context"
rel="Help"><strong>Context:</strong></a> server config<br />
<a href="directive-dict.html#Status"
rel="Help"><strong>Status:</strong></a> Base<br />
<a href="directive-dict.html#Module"
rel="Help"><strong>Module:</strong></a> mod_so
<p>The LoadModule 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. Example (Unix, and for Windows as
of Apache 1.3.15):</p>
<blockquote>
<code>LoadModule status_module modules/mod_status.so</code>
</blockquote>
<p>Example (Windows prior to Apache 1.3.15, and some 3rd party
modules):</p>
<blockquote>
<code>LoadModule foo_module modules/ApacheModuleFoo.dll<br />
</code>
</blockquote>
<p><strong>Note that all modules bundled with the Apache Win32
binary distribution were renamed as of Apache version
1.3.15</strong>.</p>
<p>Win32 Apache modules are often distributed with the old
style names, or even a name such as libfoo.dll. Whatever the
name of the module, the LoadModule directive requires the exact
filename, no assumption is made about the filename
extension.</p>
<p><strong>See also</strong>: <a
href="core.html#addmodule">AddModule</a> and <a
href="core.html#clearmodulelist">ClearModuleList</a></p>
<hr />
<h3 align="CENTER">Apache HTTP Server Version 1.3</h3>
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