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10 <title>mod_example_hooks - Apache HTTP Server Version 2.5</title>
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20 <p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
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26 <div id="page-content">
27 <div id="preamble"><h1>Apache Module mod_example_hooks</h1>
28 <div class="toplang">
29 <p><span>Available Languages: </span><a href="../en/mod/mod_example_hooks.html" title="English">&nbsp;en&nbsp;</a> |
30 <a href="../fr/mod/mod_example_hooks.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
31 <a href="../ko/mod/mod_example_hooks.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
32 </div>
33 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Illustrates the Apache module API</td></tr>
34 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
35 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>example_hooks_module</td></tr>
36 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_example_hooks.c</td></tr></table>
37 <h3>Summary</h3>
38
39     <p>The files in the <code>modules/examples</code> directory
40     under the Apache distribution directory tree are provided as an
41     example to those that wish to write modules that use the Apache
42     API.</p>
43
44     <p>The main file is <code>mod_example_hooks.c</code>, which
45     illustrates all the different callback mechanisms and call
46     syntaxes. By no means does an add-on module need to include
47     routines for all of the callbacks - quite the contrary!</p>
48
49     <p>The example module is an actual working module. If you link
50     it into your server, enable the "example-hooks-handler" handler for a
51     location, and then browse to that location, you will see a
52     display of some of the tracing the example module did as the
53     various callbacks were made.</p>
54 </div>
55 <div id="quickview"><h3>Topics</h3>
56 <ul id="topics">
57 <li><img alt="" src="../images/down.gif" /> <a href="#compiling">Compiling the example_hooks module</a></li>
58 <li><img alt="" src="../images/down.gif" /> <a href="#using">Using the <code>mod_example_hooks</code> Module</a></li>
59 </ul><h3 class="directives">Directives</h3>
60 <ul id="toc">
61 <li><img alt="" src="../images/down.gif" /> <a href="#example">Example</a></li>
62 </ul>
63 <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_example_hooks">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_example_hooks">Report a bug</a></li></ul><h3>See also</h3>
64 <ul class="seealso">
65 <li><a href="#comments_section">Comments</a></li></ul></div>
66 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
67 <div class="section">
68 <h2><a name="compiling" id="compiling">Compiling the example_hooks module</a></h2>
69
70     <p>To include the example_hooks module in your server, follow the
71     steps below:</p>
72
73     <ol>
74       <li>
75         Run <code class="program"><a href="../programs/configure.html">configure</a></code> with <code>--enable-example-hooks</code>
76         option.</li>
77
78       <li>Make the server (run "<code>make</code>").</li>
79     </ol>
80
81     <p>To add another module of your own:</p>
82
83     <ol class="up-A">
84       <li><code>cp modules/examples/mod_example_hooks.c
85       modules/new_module/<em>mod_myexample.c</em></code></li>
86
87       <li>Modify the file.</li>
88
89       <li>Create <code>modules/new_module/config.m4</code>.
90         <ol>
91           <li>Add <code>APACHE_MODPATH_INIT(new_module)</code>.</li>
92           <li>Copy APACHE_MODULE line with "example_hooks" from
93             <code>modules/examples/config.m4</code>.</li>
94           <li>Replace the first argument "example_hooks" with <em>myexample</em>.</li>
95           <li>Replace the second argument with brief description of your module.
96             It will be used in <code>configure --help</code>.</li>
97           <li>If your module needs additional C compiler flags, linker flags or
98             libraries, add them to CFLAGS, LDFLAGS and LIBS accordingly.
99             See other <code>config.m4</code> files in modules directory for
100             examples.</li>
101           <li>Add <code>APACHE_MODPATH_FINISH</code>.</li>
102         </ol>
103       </li>
104
105       <li>Create <code>module/new_module/Makefile.in</code>.
106       If your module doesn't need special build instructions,
107       all you need to have in that file is
108       <code>include $(top_srcdir)/build/special.mk</code>.</li>
109
110       <li>Run ./buildconf from the top-level directory.</li>
111
112       <li>Build the server with --enable-myexample</li>
113
114     </ol>
115 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
116 <div class="section">
117 <h2><a name="using" id="using">Using the <code>mod_example_hooks</code> Module</a></h2>
118
119     <p>To activate the example_hooks module, include a block similar to
120     the following in your <code>httpd.conf</code> file:</p>
121 <pre class="prettyprint lang-config">&lt;Location "/example-hooks-info"&gt;
122    SetHandler example-hooks-handler
123 &lt;/Location&gt;</pre>
124
125
126     <p>As an alternative, you can put the following into a <a href="core.html#accessfilename"><code>.htaccess</code></a> file
127     and then request the file "test.example" from that location:</p>
128 <pre class="prettyprint lang-config">AddHandler example-hooks-handler .example</pre>
129
130
131     <p>After reloading/restarting your server, you should be able
132     to browse to this location and see the brief display mentioned
133     earlier.</p>
134 </div>
135 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
136 <div class="directive-section"><h2><a name="Example" id="Example">Example</a> <a name="example" id="example">Directive</a></h2>
137 <table class="directive">
138 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Demonstration directive to illustrate the Apache module
139 API</td></tr>
140 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>Example</code></td></tr>
141 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
142 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
143 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_example_hooks</td></tr>
144 </table>
145     <p>The <code class="directive">Example</code> directive just sets a demonstration
146     flag which the example module's content handler displays. It
147     takes no arguments. If you browse to an URL to which the
148     example-hooks content-handler applies, you will get a display of the
149     routines within the module and how and in what order they were
150     called to service the document request. The effect of this
151     directive one can observe under the point "<code>Example
152     directive declared here: YES/NO</code>".</p>
153
154 </div>
155 </div>
156 <div class="bottomlang">
157 <p><span>Available Languages: </span><a href="../en/mod/mod_example_hooks.html" title="English">&nbsp;en&nbsp;</a> |
158 <a href="../fr/mod/mod_example_hooks.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
159 <a href="../ko/mod/mod_example_hooks.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
160 </div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&amp;A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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