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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 <program>httpd</program> 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><program>apachectl</program></seealso> | 
 | <seealso><program>httpd</program></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>v</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 variables and environment settings used to | 
 |       build <code>httpd</code>.  When invoked without <var>query</var> parameters, | 
 |       it prints all known variables and their values.  The optional <code>-v</code> | 
 |       parameter formats the list output. | 
 |  | 
 |       <p>Use this to manually determine settings used to build the | 
 |       <code>httpd</code> that will load your module.  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 <code>libtool --mode=compile</code> 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 <code>libtool --mode=link</code> command. Use this | 
 |       to add local linker-specific options.</dd> | 
 |  | 
 |       <dt><code>-p</code></dt> | 
 |       <dd>This option causes apxs to link against the apr/apr-util libraries. | 
 |       This is useful when compiling helper programs that use the apr/apr-util | 
 |       libraries.</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 /> | 
 |       /path/to/libtool --mode=compile gcc ... -c mod_foo.c<br /> | 
 |       /path/to/libtool --mode=link gcc ... -o mod_foo.la mod_foo.slo<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.la<br /> | 
 |       /path/to/instdso.sh mod_foo.la /path/to/apache/modules<br /> | 
 |       /path/to/libtool --mode=install cp mod_foo.la /path/to/apache/modules | 
 |       ... | 
 |       chmod 755 /path/to/apache/modules/mod_foo.so<br /> | 
 |       [activating module `foo' in /path/to/apache/conf/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/modules.mk<br /> | 
 |       Creating [FILE] foo/mod_foo.c<br /> | 
 |       Creating [FILE] foo/.deps<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 /> | 
 |       /path/to/libtool --mode=compile gcc ... -c mod_foo.c<br /> | 
 |       /path/to/libtool --mode=link gcc ... -o mod_foo.la mod_foo.slo<br /> | 
 |       apxs -i -a -n "foo" mod_foo.la<br /> | 
 |       /path/to/instdso.sh mod_foo.la /path/to/apache/modules<br /> | 
 |       /path/to/libtool --mode=install cp mod_foo.la /path/to/apache/modules | 
 |       ... | 
 |       chmod 755 /path/to/apache/modules/mod_foo.so<br /> | 
 |       [activating module `foo' in /path/to/apache/conf/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> | 
 |  | 
 | </section> | 
 | </manualpage> |