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-
- <manualpage metafile="apxs.xml.meta">
- <parentdocument href="./">Programs</parentdocument>
-
- <title>apxs - APache eXtenSion tool</title>
-
- <summary>
- <p><code>apxs</code> is a tool for building and installing extension
- modules for the Apache HyperText Transfer Protocol (HTTP) server. This is
- achieved by building a dynamic shared object (DSO) from one or more source
- or object <var>files</var> which then can be loaded into the Apache server
- under runtime via the <directive module="mod_so">LoadModule</directive>
- directive from <module>mod_so</module>.</p>
-
- <p>So to use this extension mechanism your platform has to support the DSO
- feature and your Apache <code>httpd</code> binary has to be built with the
- <module>mod_so</module> module. The <code>apxs</code> tool automatically
- complains if this is not the case. You can check this yourself by manually
- running the command</p>
-
- <example>
- $ httpd -l
- </example>
-
- <p>The module <module>mod_so</module> should be part of the displayed list.
- If these requirements are fulfilled you can easily extend your Apache
- server's functionality by installing your own modules with the DSO mechanism
- by the help of this <code>apxs</code> tool:</p>
-
- <example>
- $ apxs -i -a -c mod_foo.c<br />
- gcc -fpic -DSHARED_MODULE -I/path/to/apache/include -c mod_foo.c<br />
- ld -Bshareable -o mod_foo.so mod_foo.o<br />
- cp mod_foo.so /path/to/apache/modules/mod_foo.so<br />
- chmod 755 /path/to/apache/modules/mod_foo.so<br />
- [activating module `foo' in /path/to/apache/etc/httpd.conf]<br />
- $ apachectl restart<br />
- /path/to/apache/sbin/apachectl restart: httpd not running, trying to start<br />
- [Tue Mar 31 11:27:55 1998] [debug] mod_so.c(303): loaded module foo_module<br />
- /path/to/apache/sbin/apachectl restart: httpd started<br />
- $ _
- </example>
-
- <p>The arguments <var>files</var> can be any C source file (.c), a object
- file (.o) or even a library archive (.a). The <code>apxs</code> tool
- automatically recognizes these extensions and automatically used the C
- source files for compilation while just using the object and archive files
- for the linking phase. But when using such pre-compiled objects make sure
- they are compiled for position independent code (PIC) to be able to use them
- for a dynamically loaded shared object. For instance with GCC you always
- just have to use <code>-fpic</code>. For other C compilers consult its
- manual page or at watch for the flags <code>apxs</code> uses to compile the
- object files.</p>
-
- <p>For more details about DSO support in Apache read the documentation of
- <module>mod_so</module> or perhaps even read the
- <code>src/modules/standard/mod_so.c</code> source file.</p>
- </summary>
- <seealso><a href="apachectl.html">apachectl</a></seealso>
- <seealso><a href="httpd.html">httpd</a></seealso>
-
- <section id="synopsis"><title>Synopsis</title>
- <p><code><strong>apxs</strong> -<strong>g</strong>
- [ -<strong>S</strong> <var>name</var>=<var>value</var> ]
- -<strong>n</strong> <var>modname</var></code></p>
-
- <p><code><strong>apxs</strong> -<strong>q</strong>
- [ -<strong>S</strong> <var>name</var>=<var>value</var> ]
- <var>query</var> ...</code></p>
-
- <p><code><strong>apxs</strong> -<strong>c</strong>
- [ -<strong>S</strong> <var>name</var>=<var>value</var> ]
- [ -<strong>o</strong> <var>dsofile</var> ]
- [ -<strong>I</strong> <var>incdir</var> ]
- [ -<strong>D</strong> <var>name</var>=<var>value</var> ]
- [ -<strong>L</strong> <var>libdir</var> ]
- [ -<strong>l</strong> <var>libname</var> ]
- [ -<strong>Wc,</strong><var>compiler-flags</var> ]
- [ -<strong>Wl,</strong><var>linker-flags</var> ]
- <var>files</var> ...</code></p>
-
- <p><code><strong>apxs</strong> -<strong>i</strong>
- [ -<strong>S</strong> <var>name</var>=<var>value</var> ]
- [ -<strong>n</strong> <var>modname</var> ]
- [ -<strong>a</strong> ]
- [ -<strong>A</strong> ]
- <var>dso-file</var> ...</code></p>
-
- <p><code><strong>apxs</strong> -<strong>e</strong>
- [ -<strong>S</strong> <var>name</var>=<var>value</var> ]
- [ -<strong>n</strong> <var>modname</var> ]
- [ -<strong>a</strong> ]
- [ -<strong>A</strong> ]
- <var>dso-file</var> ...</code></p>
- </section>
-
- <section id="options"><title>Options</title>
- <section id="options.common"><title>Common Options</title>
- <dl>
- <dt><code>-n <var>modname</var></code></dt>
- <dd>This explicitly sets the module name for the <code>-i</code> (install)
- and <code>-g</code> (template generation) option. Use this to explicitly
- specify the module name. For option <code>-g</code> this is required, for
- option <code>-i</code> the <code>apxs</code> tool tries to determine the
- name from the source or (as a fallback) at least by guessing it from the
- filename.</dd>
- </dl>
- </section>
-
- <section id="options.query"><title>Query Options</title>
- <dl>
- <dt><code>-q</code></dt>
- <dd>Performs a query for <code>apxs</code>'s knowledge about certain
- settings. The <var>query</var> parameters can be one or more of the
- following strings: <code>CC</code>, <code>CFLAGS</code>,
- <code>CFLAGS_SHLIB</code>, <code>INCLUDEDIR</code>, <code>LD_SHLIB</code>,
- <code>LDFLAGS_SHLIB</code>, <code>LIBEXECDIR</code>,
- <code>LIBS_SHLIB</code>, <code>SBINDIR</code>, <code>SYSCONFDIR</code>,
- <code>TARGET</code>.
-
- <p>Use this for manually determining settings. For instance use</p>
- <example>
- INC=-I`apxs -q INCLUDEDIR`
- </example>
-
- <p>inside your own Makefiles if you need manual access to Apache's C
- header files.</p></dd>
- </dl>
- </section>
-
- <section id="options.conf"><title>Configuration Options</title>
- <dl>
- <dt><code>-S <var>name</var>=<var>value</var></code></dt>
- <dd>This option changes the apxs settings described above.</dd>
- </dl>
- </section>
-
- <section id="options.template"><title>Template Generation Options</title>
- <dl>
- <dt><code>-g</code></dt>
- <dd>This generates a subdirectory <var>name</var> (see option
- <code>-n</code>) and there two files: A sample module source file named
- <code>mod_<var>name</var>.c</code> which can be used as a template for
- creating your own modules or as a quick start for playing with the
- apxs mechanism. And a corresponding <code>Makefile</code> for even easier
- build and installing of this module.</dd>
- </dl>
- </section>
-
- <section id="options.dso"><title>DSO Compilation Options</title>
- <dl>
- <dt><code>-c</code></dt>
- <dd>This indicates the compilation operation. It first compiles the C
- source files (.c) of <var>files</var> into corresponding object files (.o)
- and then builds a dynamically shared object in <var>dsofile</var> by
- linking these object files plus the remaining object files (.o and .a) of
- <var>files</var>. If no <code>-o</code> option is specified the output
- file is guessed from the first filename in <var>files</var> and thus
- usually defaults to <code>mod_<var>name</var>.so</code>.</dd>
-
- <dt><code>-o <var>dsofile</var></code></dt>
- <dd>Explicitly specifies the filename of the created dynamically shared
- object. If not specified and the name cannot be guessed from the
- <var>files</var> list, the fallback name <code>mod_unknown.so</code> is
- used.</dd>
-
- <dt><code>-D <var>name</var>=<var>value</var></code></dt>
- <dd>This option is directly passed through to the compilation command(s).
- Use this to add your own defines to the build process.</dd>
-
- <dt><code>-I <var>incdir</var></code></dt>
- <dd>This option is directly passed through to the compilation command(s).
- Use this to add your own include directories to search to the build
- process.</dd>
-
- <dt><code>-L <var>libdir</var></code></dt>
- <dd>This option is directly passed through to the linker command. Use this
- to add your own library directories to search to the build process.</dd>
-
- <dt><code>-l <var>libname</var></code></dt>
- <dd>This option is directly passed through to the linker command. Use this
- to add your own libraries to search to the build process.</dd>
-
- <dt><code>-Wc,<var>compiler-flags</var></code></dt>
- <dd>This option passes <var>compiler-flags</var> as additional flags to
- the compiler command. Use this to add local compiler-specific options.</dd>
-
- <dt><code>-Wl,<var>linker-flags</var></code></dt>
- <dd>This option passes <var>linker-flags</var> as additional flags to
- the linker command. Use this to add local linker-specific options.</dd>
- </dl>
- </section>
-
- <section id="options.dsoinstall">
- <title>DSO Installation and Configuration Options</title>
- <dl>
- <dt><code>-i</code></dt>
- <dd>This indicates the installation operation and installs one or more
- dynamically shared objects into the server's <var>modules</var>
- directory.</dd>
-
- <dt><code>-a</code></dt>
- <dd>This activates the module by automatically adding a corresponding
- <directive module="mod_so">LoadModule</directive> line to Apache's
- <code>httpd.conf</code> configuration file, or by enabling it if it
- already exists.</dd>
-
- <dt><code>-A</code></dt>
- <dd>Same as option <code>-a</code> but the created <directive
- module="mod_so">LoadModule</directive> directive is prefixed with a hash
- sign (<code>#</code>), <em>i.e.</em>, the module is just prepared for
- later activation but initially disabled.</dd>
-
- <dt><code>-e</code></dt>
- <dd>This indicates the editing operation, which can be used with the
- <code>-a</code> and <code>-A</code> options similarly to the
- <code>-i</code> operation to edit Apache's <code>httpd.conf</code>
- configuration file without attempting to install the module.</dd>
- </dl>
- </section>
- </section>
-
- <section id="examples"><title>Examples</title>
- <p>Assume you have an Apache module named <code>mod_foo.c</code> available
- which should extend Apache's server functionality. To accomplish this you
- first have to compile the C source into a shared object suitable for loading
- into the Apache server under runtime via the following command:</p>
-
- <example>
- $ apxs -c mod_foo.c<br />
- gcc -fpic -DSHARED_MODULE -I/path/to/apache/include -c mod_foo.c<br />
- ld -Bshareable -o mod_foo.so mod_foo.o<br />
- $ _
- </example>
-
- <p>Then you have to update the Apache configuration by making sure a
- <directive module="mod_so">LoadModule</directive> directive is present to
- load this shared object. To simplify this step <code>apxs</code> provides
- an automatic way to install the shared object in its "modules" directory
- and updating the <code>httpd.conf</code> file accordingly. This can be
- achieved by running:</p>
-
- <example>
- $ apxs -i -a mod_foo.c<br />
- cp mod_foo.so /path/to/apache/modules/mod_foo.so<br />
- chmod 755 /path/to/apache/modules/mod_foo.so<br />
- [activating module `foo' in /path/to/apache/etc/httpd.conf]<br />
- $ _
- </example>
-
- <p>This way a line named</p>
-
- <example>
- LoadModule foo_module modules/mod_foo.so
- </example>
-
- <p>is added to the configuration file if still not present. If you want to
- have this disabled per default use the <code>-A</code> option,
- <em>i.e.</em></p>
-
- <example>
- $ apxs -i -A mod_foo.c
- </example>
-
- <p>For a quick test of the apxs mechanism you can create a sample Apache
- module template plus a corresponding Makefile via:</p>
-
- <example>
- $ apxs -g -n foo<br />
- Creating [DIR] foo<br />
- Creating [FILE] foo/Makefile<br />
- Creating [FILE] foo/mod_foo.c<br />
- $ _
- </example>
-
- <p>Then you can immediately compile this sample module into a shared object
- and load it into the Apache server:</p>
-
- <example>
- $ cd foo<br />
- $ make all reload<br />
- apxs -c mod_foo.c<br />
- gcc -fpic -DSHARED_MODULE -I/path/to/apache/include -c mod_foo.c<br />
- ld -Bshareable -o mod_foo.so mod_foo.o<br />
- apxs -i -a -n "foo" mod_foo.so<br />
- cp mod_foo.so /path/to/apache/modules/mod_foo.so<br />
- chmod 755 /path/to/apache/modules/mod_foo.so<br />
- [activating module `foo' in /path/to/apache/etc/httpd.conf]<br />
- apachectl restart<br />
- /path/to/apache/sbin/apachectl restart: httpd not running, trying to start<br />
- [Tue Mar 31 11:27:55 1998] [debug] mod_so.c(303): loaded module foo_module<br />
- /path/to/apache/sbin/apachectl restart: httpd started<br />
- $ _
- </example>
-
- <p>You can even use <code>apxs</code> to compile complex modules outside the
- Apache source tree, like PHP3:</p>
-
- <example>
- $ cd php3<br />
- $ ./configure --with-shared-apache=../apache-1.3<br />
- $ apxs -c -o libphp3.so mod_php3.c libmodphp3-so.a<br />
- gcc -fpic -DSHARED_MODULE -I/tmp/apache/include -c mod_php3.c<br />
- ld -Bshareable -o libphp3.so mod_php3.o libmodphp3-so.a<br />
- $ _
- </example>
-
- <p>because <code>apxs</code> automatically recognized C source files and
- object files. Only C source files are compiled while remaining object
- files are used for the linking phase.</p>
- </section>
- </manualpage>
-