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<div id="projectname">libwebsockets
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<div id="projectbrief">Lightweight C library for HTML5 websockets</div>
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<div class="title">Protocols and Plugins</div> </div>
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Modules</h2></td></tr>
<tr class="memitem:group__generic-sessions"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__generic-sessions.html">plugin: generic-sessions</a></td></tr>
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Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structlws__protocols.html">lws_protocols</a></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structlws__plugin__capability.html">lws_plugin_capability</a></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structlws__plugin.html">lws_plugin</a></td></tr>
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Typedefs</h2></td></tr>
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typedef int(* </td><td class="memItemRight" valign="bottom"><b>lws_plugin_init_func</b>) (struct lws_context *, struct <a class="el" href="structlws__plugin__capability.html">lws_plugin_capability</a> *)</td></tr>
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typedef int(* </td><td class="memItemRight" valign="bottom"><b>lws_plugin_destroy_func</b>) (struct lws_context *)</td></tr>
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Functions</h2></td></tr>
<tr class="memitem:ga25754726d97c5f519d313e691a9fe29d"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN const struct <a class="el" href="structlws__protocols.html">lws_protocols</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Protocols-and-Plugins.html#ga25754726d97c5f519d313e691a9fe29d">lws_vhost_name_to_protocol</a> (struct lws_vhost *vh, const char *name)</td></tr>
<tr class="separator:ga25754726d97c5f519d313e691a9fe29d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga72ad550786ca7976463589d347e62112"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN const struct <a class="el" href="structlws__protocols.html">lws_protocols</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Protocols-and-Plugins.html#ga72ad550786ca7976463589d347e62112">lws_get_protocol</a> (struct lws *wsi)</td></tr>
<tr class="separator:ga72ad550786ca7976463589d347e62112"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga8bbe5e65faca068845704bab911a5030"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN const struct <a class="el" href="structlws__protocols.html">lws_protocols</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Protocols-and-Plugins.html#ga8bbe5e65faca068845704bab911a5030">lws_protocol_get</a> (struct lws *wsi) LWS_WARN_DEPRECATED</td></tr>
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<tr class="memitem:gaec0c0477288ff3f83aff38d357b883d1"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN void * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Protocols-and-Plugins.html#gaec0c0477288ff3f83aff38d357b883d1">lws_protocol_vh_priv_zalloc</a> (struct lws_vhost *vhost, const struct <a class="el" href="structlws__protocols.html">lws_protocols</a> *prot, int size)</td></tr>
<tr class="separator:gaec0c0477288ff3f83aff38d357b883d1"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaf3be4243443baac0f8be1fcfb4d25129"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN void * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Protocols-and-Plugins.html#gaf3be4243443baac0f8be1fcfb4d25129">lws_protocol_vh_priv_get</a> (struct lws_vhost *vhost, const struct <a class="el" href="structlws__protocols.html">lws_protocols</a> *prot)</td></tr>
<tr class="separator:gaf3be4243443baac0f8be1fcfb4d25129"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga106b37ae9c247e84d191ab09441adc43"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__Protocols-and-Plugins.html#ga106b37ae9c247e84d191ab09441adc43">lws_finalize_startup</a> (struct lws_context *context)</td></tr>
<tr class="separator:ga106b37ae9c247e84d191ab09441adc43"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2>Protocol and protocol plugin -related apis</h2>
<p>Protocols bind ws protocol names to a custom callback specific to that protocol implementaion.</p>
<p>A list of protocols can be passed in at context creation time, but it is also legal to leave that NULL and add the protocols and their callback code using plugins.</p>
<p>Plugins are much preferable compared to cut and pasting code into an application each time, since they can be used standalone. </p>
<h2 class="groupheader">Function Documentation</h2>
<a id="ga106b37ae9c247e84d191ab09441adc43"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga106b37ae9c247e84d191ab09441adc43">§ </a></span>lws_finalize_startup()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN int lws_finalize_startup </td>
<td>(</td>
<td class="paramtype">struct lws_context * </td>
<td class="paramname"><em>context</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include <<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>></code></p>
<p><a class="el" href="group__Protocols-and-Plugins.html#ga106b37ae9c247e84d191ab09441adc43">lws_finalize_startup()</a> - drop initial process privileges</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">context</td><td>lws context</td></tr>
</table>
</dd>
</dl>
<p>This is called after the end of the vhost protocol initializations, but you may choose to call it earlier </p>
</div>
</div>
<a id="ga72ad550786ca7976463589d347e62112"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga72ad550786ca7976463589d347e62112">§ </a></span>lws_get_protocol()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN const struct <a class="el" href="structlws__protocols.html">lws_protocols</a>* lws_get_protocol </td>
<td>(</td>
<td class="paramtype">struct lws * </td>
<td class="paramname"><em>wsi</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include <<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>></code></p>
<p><a class="el" href="group__Protocols-and-Plugins.html#ga72ad550786ca7976463589d347e62112">lws_get_protocol()</a> - Returns a protocol pointer from a websocket connection. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">wsi</td><td>pointer to struct websocket you want to know the protocol of</td></tr>
</table>
</dd>
</dl>
<pre class="fragment"> Some apis can act on all live connections of a given protocol,
this is how you can get a pointer to the active protocol if needed.</pre>
</div>
</div>
<a id="ga8bbe5e65faca068845704bab911a5030"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga8bbe5e65faca068845704bab911a5030">§ </a></span>lws_protocol_get()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN const struct <a class="el" href="structlws__protocols.html">lws_protocols</a>* lws_protocol_get </td>
<td>(</td>
<td class="paramtype">struct lws * </td>
<td class="paramname"><em>wsi</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include <<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>></code></p>
<p><a class="el" href="group__Protocols-and-Plugins.html#ga8bbe5e65faca068845704bab911a5030">lws_protocol_get()</a> - deprecated: use lws_get_protocol </p>
</div>
</div>
<a id="gaf3be4243443baac0f8be1fcfb4d25129"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaf3be4243443baac0f8be1fcfb4d25129">§ </a></span>lws_protocol_vh_priv_get()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN void* lws_protocol_vh_priv_get </td>
<td>(</td>
<td class="paramtype">struct lws_vhost * </td>
<td class="paramname"><em>vhost</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const struct <a class="el" href="structlws__protocols.html">lws_protocols</a> * </td>
<td class="paramname"><em>prot</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include <<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>></code></p>
<p><a class="el" href="group__Protocols-and-Plugins.html#gaf3be4243443baac0f8be1fcfb4d25129">lws_protocol_vh_priv_get()</a> - retreive a protocol's per-vhost storage</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">vhost</td><td>vhost the instance is related to </td></tr>
<tr><td class="paramname">prot</td><td>protocol the instance is related to</td></tr>
</table>
</dd>
</dl>
<p>Recover a pointer to the allocated per-vhost storage for the protocol created by <a class="el" href="group__Protocols-and-Plugins.html#gaec0c0477288ff3f83aff38d357b883d1">lws_protocol_vh_priv_zalloc()</a> earlier </p>
</div>
</div>
<a id="gaec0c0477288ff3f83aff38d357b883d1"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaec0c0477288ff3f83aff38d357b883d1">§ </a></span>lws_protocol_vh_priv_zalloc()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN void* lws_protocol_vh_priv_zalloc </td>
<td>(</td>
<td class="paramtype">struct lws_vhost * </td>
<td class="paramname"><em>vhost</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const struct <a class="el" href="structlws__protocols.html">lws_protocols</a> * </td>
<td class="paramname"><em>prot</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>size</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include <<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>></code></p>
<p><a class="el" href="group__Protocols-and-Plugins.html#gaec0c0477288ff3f83aff38d357b883d1">lws_protocol_vh_priv_zalloc()</a> - Allocate and zero down a protocol's per-vhost storage </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">vhost</td><td>vhost the instance is related to </td></tr>
<tr><td class="paramname">prot</td><td>protocol the instance is related to </td></tr>
<tr><td class="paramname">size</td><td>bytes to allocate</td></tr>
</table>
</dd>
</dl>
<p>Protocols often find it useful to allocate a per-vhost struct, this is a helper to be called in the per-vhost init LWS_CALLBACK_PROTOCOL_INIT </p>
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<a id="ga25754726d97c5f519d313e691a9fe29d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga25754726d97c5f519d313e691a9fe29d">§ </a></span>lws_vhost_name_to_protocol()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN const struct <a class="el" href="structlws__protocols.html">lws_protocols</a>* lws_vhost_name_to_protocol </td>
<td>(</td>
<td class="paramtype">struct lws_vhost * </td>
<td class="paramname"><em>vh</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>name</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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</div><div class="memdoc">
<p><code>#include <<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>></code></p>
<p><a class="el" href="group__Protocols-and-Plugins.html#ga25754726d97c5f519d313e691a9fe29d">lws_vhost_name_to_protocol()</a> - get vhost's protocol object from its name</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">vh</td><td>vhost to search </td></tr>
<tr><td class="paramname">name</td><td>protocol name</td></tr>
</table>
</dd>
</dl>
<p>Returns NULL or a pointer to the vhost's protocol of the requested name </p>
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