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<h2><a href="https://wiki.asterisk.org/wiki/display/AST/Modules">Modules</a></h2>
<h4>Page <b>edited</b> by <a href="https://wiki.asterisk.org/wiki/display/~lathama">Andrew Latham</a>
</h4>
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<b>Comment:</b>
Update doc-block<br />
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<br/>
<h4>Changes (3)</h4>
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<tr><td class="diff-snipped" >...<br></td></tr>
<tr><td class="diff-unchanged" >/*! <br> * \brief Load Module <br></td></tr>
<tr><td class="diff-added-lines" style="background-color: #dfd;"> * Test dependencies and configuration requirements. Act upon results <br> * by loading, declining to load, or failure to load. <br></td></tr>
<tr><td class="diff-unchanged" > * <br></td></tr>
<tr><td class="diff-deleted-lines" style="color:#999;background-color:#fdd;text-decoration:line-through;"> * \par This module uses the following configuration files: <br> * <br> * \verbinclude example.conf.sample <br> * <br></td></tr>
<tr><td class="diff-added-lines" style="background-color: #dfd;"> * \return module load disposition <br></td></tr>
<tr><td class="diff-unchanged" > */ <br>static int load_module(void) <br></td></tr>
<tr><td class="diff-snipped" >...<br></td></tr>
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</div> <h4>Full Content</h4>
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<p>All modules must have at least the following:</p>
<h2><a name="Modules-LoadModule"></a>Load Module</h2>
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<pre class="theme: Confluence; brush: java; gutter: false">static int load_module():</pre>
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<p>Module loading including tests for configuration or dependencies. This function can return <b>AST_MODULE_LOAD_FAILURE</b>, <b>AST_MODULE_LOAD_DECLINE</b>, or <b>AST_MODULE_LOAD_SUCCESS</b>. If a dependency or environment variable fails tests return <b>AST_MODULE_LOAD_FAILURE</b>. If the module can not load the configuration file or other non-critical problem return <b>AST_MODULE_LOAD_DECLINE</b>. On success return <b>AST_MODULE_LOAD_SUCCESS</b>.</p>
<p>Example:</p>
<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="theme: Confluence; brush: java; gutter: false">/*!
* \brief Load Module
* Test dependencies and configuration requirements. Act upon results
* by loading, declining to load, or failure to load.
*
* \return module load disposition
*/
static int load_module(void)
{
if (dependency_does_not_exist) {
return AST_MODULE_LOAD_FAILURE;
}
if (configuration_file_does_not_exist) {
return AST_MODULE_LOAD_DECLINE;
}
return AST_MODULE_LOAD_SUCCESS;
}</pre>
</div></div>
<h2><a name="Modules-UnloadModule"></a>Unload Module</h2>
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<pre class="theme: Confluence; brush: java; gutter: false">static int unload_module():</pre>
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<p>The module will soon be unloaded. If any channels are using your features, you should give them a softhangup in an effort to keep the program from crashing. Generally, unload_module is only called when the usecount is 0 or less, but the user can force unloading at their discretion, and thus a module should do its best to comply (although in some cases there may be no way to avoid a crash). This function should return 0 on success and non-zero on failure (i.e. it cannot yet be unloaded).</p>
<p>Example:</p>
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<pre class="theme: Confluence; brush: java; gutter: false">/*!
* \brief Unload Module
*/
static int unload_module(void)
{
if (active_use) {
return -1;
}
return 0;
}</pre>
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<h2><a name="Modules-ModuleInformation"></a>Module Information</h2>
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<pre class="theme: Confluence; brush: java; gutter: false">AST_MODULE_INFO_STANDARD(keystr, desc);
... or ...
AST_MODULE_INFO(keystr, flags_to_set, desc, load_func, unload_func, reload_func, load_pri);</pre>
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<p><b>AST_MODULE_INFO_STANDARD</b></p>
<ul>
<li>keystr - Applicable license for module. In most cases this is ASTERISK_GPL_KEY.</li>
<li>desc - Description of module.</li>
</ul>
<p><b>AST_MODULE_INFO</b></p>
<ul>
<li>keystr</li>
<li>flags_to_set</li>
<li>desc</li>
<li>load_func</li>
<li>unload_func</li>
<li>reload_func</li>
<li>load_pri</li>
</ul>
</div>
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