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186 lines
7.4 KiB
HTML
186 lines
7.4 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org" />
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<title>Apache module mod_so</title>
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</head>
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<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
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<body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
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vlink="#000080" alink="#FF0000">
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<!--#include virtual="header.html" -->
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<h1 align="CENTER">Module mod_so</h1>
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<p>This module provides for loading of executable code and
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modules into the server at start-up or restart time.</p>
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<p><a href="module-dict.html#Status"
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rel="Help"><strong>Status:</strong></a> Base (Windows);
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Optional (Unix)<br />
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<a href="module-dict.html#SourceFile"
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rel="Help"><strong>Source File:</strong></a> mod_so.c<br />
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<a href="module-dict.html#ModuleIdentifier"
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rel="Help"><strong>Module Identifier:</strong></a>
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so_module<br />
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<a href="module-dict.html#Compatibility"
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rel="Help"><strong>Compatibility:</strong></a> Available in
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Apache 1.3 and later.</p>
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<h2>Summary</h2>
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<p>On selected operating systems this module can be used to
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load modules into Apache at runtime via the <a
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href="../dso.html">Dynamic Shared Object</a> (DSO) mechanism,
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rather than requiring a recompilation.</p>
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<p>On Unix, the loaded code typically comes from shared object
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files (usually with <samp>.so</samp> extension), on Windows
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this may either the <samp>.so</samp> or <samp>.dll</samp>
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extension. This module is only available in Apache 1.3 and
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up.</p>
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<p>In previous releases, the functionality of this module was
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provided for Unix by mod_dld, and for Windows by mod_dll. On
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Windows, mod_dll was used in beta release 1.3b1 through 1.3b5.
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mod_so combines these two modules into a single module for all
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operating systems.</p>
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<p><strong>Warning: Apache 1.3 modules cannot be directly used
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with Apache 2.0 - the module must be modified to dynamically
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load or compile into Apache 2.0</strong>.</p>
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<h2>Directives</h2>
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<ul>
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<li><a href="#loadfile">LoadFile</a></li>
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<li><a href="#loadmodule">LoadModule</a></li>
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</ul>
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<h2><a id="creating" name="creating">Creating Loadable Modules
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for Windows</a></h2>
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<p><strong>Note: the module name format changed for Windows
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with Apache 1.3.15 and 2.0 - the modules are now named as
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mod_foo.so</strong>. While mod_so still loads modules with
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ApacheModuleFoo.dll names, the new naming convention is
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preferred; if you are converting your loadable module for 2.0,
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please fix the name to this 2.0 convention.</p>
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<p>The Apache module API is unchanged between the Unix and
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Windows versions. Many modules will run on Windows with no or
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little change from Unix, although others rely on aspects of the
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Unix architecture which are not present in Windows, and will
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not work.</p>
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<p>When a module does work, it can be added to the server in
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one of two ways. As with Unix, it can be compiled into the
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server. Because Apache for Windows does not have the
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<code>Configure</code> program of Apache for Unix, the module's
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source file must be added to the ApacheCore project file, and
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its symbols must be added to the
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<code>os\win32\modules.c</code> file.</p>
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<p>The second way is to compile the module as a DLL, a shared
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library that can be loaded into the server at runtime, using
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the <code><a href="#loadmodule">LoadModule</a></code>
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directive. These module DLLs can be distributed and run on any
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Apache for Windows installation, without recompilation of the
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server.</p>
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<p>To create a module DLL, a small change is necessary to the
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module's source file: The module record must be exported from
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the DLL (which will be created later; see below). To do this,
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add the <code>AP_MODULE_DECLARE_DATA</code> (defined in the
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Apache header files) to your module's module record definition.
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For example, if your module has:</p>
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<pre>
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module foo_module;
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</pre>
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<p>Replace the above with:</p>
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<pre>
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module AP_MODULE_DECLARE_DATA foo_module;
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</pre>
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<p>Note that this will only be activated on Windows, so the
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module can continue to be used, unchanged, with Unix if needed.
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Also, if you are familiar with <code>.DEF</code> files, you can
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export the module record with that method instead.</p>
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<p>Now, create a DLL containing your module. You will need to
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link this against the libhttpd.lib export library that is
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created when the libhttpd.dll shared library is compiled. You
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may also have to change the compiler settings to ensure that
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the Apache header files are correctly located. You can find
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this library in your server root's modules directory. It is
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best to grab an existing module .dsp file from the tree to
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assure the build environment is configured correctly, or
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alternately compare the compiler and link options to your
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.dsp.</p>
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<p>This should create a DLL version of your module. Now simply
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place it in the <samp>modules</samp> directory of your server
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root, and use the <code><a
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href="#loadmodule">LoadModule</a></code> directive to load
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it.</p>
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<hr />
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<h2><a id="loadfile" name="loadfile">LoadFile</a>
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directive</h2>
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<!--%plaintext <?INDEX {\tt LoadFile} directive> -->
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<a href="directive-dict.html#Syntax"
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rel="Help"><strong>Syntax:</strong></a> LoadFile
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<em>filename</em> [<em>filename</em>] ...<br />
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<a href="directive-dict.html#Context"
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rel="Help"><strong>Context:</strong></a> server config<br />
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<a href="directive-dict.html#Status"
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rel="Help"><strong>Status:</strong></a> Base<br />
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<a href="directive-dict.html#Module"
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rel="Help"><strong>Module:</strong></a> mod_so
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<p>The LoadFile directive links in the named object files or
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libraries when the server is started or restarted; this is used
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to load additional code which may be required for some module
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to work. <em>Filename</em> is either an absolute path or
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relative to <a href="core.html#serverroot">ServerRoot</a>.</p>
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<hr />
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<h2><a id="loadmodule" name="loadmodule">LoadModule</a>
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directive</h2>
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<!--%plaintext <?INDEX {\tt LoadModule} directive> -->
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<a href="directive-dict.html#Syntax"
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rel="Help"><strong>Syntax:</strong></a> LoadModule <em>module
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filename</em><br />
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<a href="directive-dict.html#Context"
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rel="Help"><strong>Context:</strong></a> server config<br />
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<a href="directive-dict.html#Status"
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rel="Help"><strong>Status:</strong></a> Base<br />
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<a href="directive-dict.html#Module"
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rel="Help"><strong>Module:</strong></a> mod_so
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<p>The LoadModule directive links in the object file or library
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<em>filename</em> and adds the module structure named
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<em>module</em> to the list of active modules. <em>Module</em>
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is the name of the external variable of type
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<code>module</code> in the file, and is listed as the <a
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href="module-dict.html#ModuleIdentifier">Module Identifier</a>
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in the module documentation. Example:</p>
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<blockquote>
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<code>LoadModule status_module modules/mod_status.so</code>
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</blockquote>
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<p>loads the named module from the modules subdirectory of the
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ServerRoot.</p>
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<p><!--#include virtual="footer.html" -->
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</p>
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</body>
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</html>
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