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Andy Green b22ef6775b docs
2017-03-20 19:37:47 +08:00

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<title>libwebsockets: Socket adoption helpers</title>
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<div id="projectbrief">Lightweight C library for HTML5 websockets</div>
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<div class="title">Socket adoption helpers</div> </div>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:gabe71b7462afb21c767bdc67334f305af"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN struct lws *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__sock-adopt.html#gabe71b7462afb21c767bdc67334f305af">lws_adopt_socket</a> (struct lws_context *context, lws_sockfd_type accept_fd)</td></tr>
<tr class="separator:gabe71b7462afb21c767bdc67334f305af"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gab2d045df0f81afe00891aaed312d552b"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN struct lws *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__sock-adopt.html#gab2d045df0f81afe00891aaed312d552b">lws_adopt_socket_readbuf</a> (struct lws_context *context, lws_sockfd_type accept_fd, const char *readbuf, size_t len)</td></tr>
<tr class="separator:gab2d045df0f81afe00891aaed312d552b"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2>Socket adoption helpers</h2>
<p>When integrating with an external app with its own event loop, these can be used to accept connections from someone else's listening socket.</p>
<p>When using lws own event loop, these are not needed. </p>
<h2 class="groupheader">Function Documentation</h2>
<a id="gabe71b7462afb21c767bdc67334f305af"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gabe71b7462afb21c767bdc67334f305af">&#9670;&nbsp;</a></span>lws_adopt_socket()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN struct lws* lws_adopt_socket </td>
<td>(</td>
<td class="paramtype">struct lws_context *&#160;</td>
<td class="paramname"><em>context</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">lws_sockfd_type&#160;</td>
<td class="paramname"><em>accept_fd</em>&#160;</td>
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<td></td>
<td>)</td>
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<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p><a class="el" href="group__sock-adopt.html#gabe71b7462afb21c767bdc67334f305af">lws_adopt_socket()</a> - adopt foreign socket as if listen socket accepted it </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">context</td><td>lws context </td></tr>
<tr><td class="paramname">accept_fd</td><td>fd of already-accepted socket to adopt</td></tr>
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</dd>
</dl>
<p>Either returns new wsi bound to accept_fd, or closes accept_fd and returns NULL, having cleaned up any new wsi pieces.</p>
<p>LWS adopts the socket in http serving mode, it's ready to accept an upgrade to ws or just serve http. </p>
</div>
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<a id="gab2d045df0f81afe00891aaed312d552b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gab2d045df0f81afe00891aaed312d552b">&#9670;&nbsp;</a></span>lws_adopt_socket_readbuf()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN struct lws* lws_adopt_socket_readbuf </td>
<td>(</td>
<td class="paramtype">struct lws_context *&#160;</td>
<td class="paramname"><em>context</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">lws_sockfd_type&#160;</td>
<td class="paramname"><em>accept_fd</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>readbuf</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t&#160;</td>
<td class="paramname"><em>len</em>&#160;</td>
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<td>)</td>
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<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p><a class="el" href="group__sock-adopt.html#gab2d045df0f81afe00891aaed312d552b">lws_adopt_socket_readbuf()</a> - adopt foreign socket and first rx as if listen socket accepted it </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">context</td><td>lws context </td></tr>
<tr><td class="paramname">accept_fd</td><td>fd of already-accepted socket to adopt </td></tr>
<tr><td class="paramname">readbuf</td><td>NULL or pointer to data that must be drained before reading from accept_fd </td></tr>
<tr><td class="paramname">len</td><td>The length of the data held at</td></tr>
<tr><td class="paramname">readbuf</td><td>Either returns new wsi bound to accept_fd, or closes accept_fd and returns NULL, having cleaned up any new wsi pieces.</td></tr>
</table>
</dd>
</dl>
<p>LWS adopts the socket in http serving mode, it's ready to accept an upgrade to ws or just serve http.</p>
<p>If your external code did not already read from the socket, you can use <a class="el" href="group__sock-adopt.html#gabe71b7462afb21c767bdc67334f305af">lws_adopt_socket()</a> instead.</p>
<p>This api is guaranteed to use the data at</p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">readbuf</td><td>first, before reading from the socket.</td></tr>
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</dd>
</dl>
<p>readbuf is limited to the size of the ah rx buf, currently 2048 bytes. </p>
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