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Andy Green be9fb919d1 context deprecation 
1) This makes lwsws run a parent process with the original permissions.
But this process is only able to respond to SIGHUP, it doesn't do anything
else.

2) You can send this parent process a SIGHUP now to cause it to

 - close listening sockets in existing lwsws processes

 - mark those processes as to exit when the number of active connections
   on the falls to zero

 - spawn a fresh child process from scratch, using latest configuration
   file content, latest plugins, etc.  It can now reopen listening sockets
   if it chooses to, or open different listen ports or whatever.

Notes:

1) lws_context_destroy() has been split into two pieces... the reason for
the split is the first part closes the per-vhost protocols, but since
they may have created libuv objects in the per-vhost protocol storage,
these cannot be freed until after the loop has been run.

That's the purpose of the second part of the context destruction,
lws_context_destroy2().

For compatibility, if you are not using libuv, the first part calls the
second part.  However if you are using libuv, you must now call the
second part from your own main.c after the first part.
2016-12-20 14:37:07 +08:00

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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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<a href="#typedef-members">Typedefs</a> &#124;
<a href="#enum-members">Enumerations</a> &#124;
<a href="#func-members">Functions</a> </div>
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<div class="title">Form Parsing<div class="ingroups"><a class="el" href="group__http.html">HTTP</a></div></div> </div>
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Typedefs</h2></td></tr>
<tr class="memitem:ga5a70527c0861c2ffa3d29333a6aa7f8e"><td class="memItemLeft" align="right" valign="top">typedef int(*&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__form-parsing.html#ga5a70527c0861c2ffa3d29333a6aa7f8e">lws_spa_fileupload_cb</a>) (void *data, const char *name, const char *filename, char *buf, int len, enum <a class="el" href="group__form-parsing.html#ga41a74a822771d3dce89751aa3bce28ae">lws_spa_fileupload_states</a> state)</td></tr>
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Enumerations</h2></td></tr>
<tr class="memitem:ga41a74a822771d3dce89751aa3bce28ae"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__form-parsing.html#ga41a74a822771d3dce89751aa3bce28ae">lws_spa_fileupload_states</a> { <a class="el" href="group__form-parsing.html#gga41a74a822771d3dce89751aa3bce28aead3a958e7719ac273c3ba4f684f00c87f">LWS_UFS_CONTENT</a>,
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<a class="el" href="group__form-parsing.html#gga41a74a822771d3dce89751aa3bce28aea2d25de44865bd44e5a3903a2bab9ca83">LWS_UFS_OPEN</a>
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Functions</h2></td></tr>
<tr class="memitem:ga162f86762173a2bc8c28497941d74815"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN struct lws_spa *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__form-parsing.html#ga162f86762173a2bc8c28497941d74815">lws_spa_create</a> (struct lws *wsi, const char *const *param_names, int count_params, int max_storage, <a class="el" href="group__form-parsing.html#ga5a70527c0861c2ffa3d29333a6aa7f8e">lws_spa_fileupload_cb</a> opt_cb, void *opt_data)</td></tr>
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<tr class="memitem:ga9ad9ebf5ea1a7108415ed7e04cb231d2"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__form-parsing.html#ga9ad9ebf5ea1a7108415ed7e04cb231d2">lws_spa_process</a> (struct lws_spa *spa, const char *in, int len)</td></tr>
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<tr class="memitem:ga83835bf250ee3d4a60f36a182f2b8d24"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__form-parsing.html#ga83835bf250ee3d4a60f36a182f2b8d24">lws_spa_finalize</a> (struct lws_spa *spa)</td></tr>
<tr class="separator:ga83835bf250ee3d4a60f36a182f2b8d24"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga3fbe378632f85ec9a14cc2c1687bf05f"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__form-parsing.html#ga3fbe378632f85ec9a14cc2c1687bf05f">lws_spa_get_length</a> (struct lws_spa *spa, int n)</td></tr>
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<tr class="memitem:ga2da476217166da02704b90d3a8d4f3cd"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN const char *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__form-parsing.html#ga2da476217166da02704b90d3a8d4f3cd">lws_spa_get_string</a> (struct lws_spa *spa, int n)</td></tr>
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<tr class="memitem:gaaa482f07dad3f04b391cccf0a814e13b"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__form-parsing.html#gaaa482f07dad3f04b391cccf0a814e13b">lws_spa_destroy</a> (struct lws_spa *spa)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2>POSTed form parsing functions</h2>
<p>These lws_spa (stateful post arguments) apis let you parse and urldecode POSTed form arguments, both using simple urlencoded and multipart transfer encoding.</p>
<p>It's capable of handling file uploads as well a named input parsing, and the apis are the same for both form upload styles.</p>
<p>You feed it a list of parameter names and it creates pointers to the urldecoded arguments: file upload parameters pass the file data in chunks to a user-supplied callback as they come.</p>
<p>Since it's stateful, it handles the incoming data needing more than one POST_BODY callback and has no limit on uploaded file size. </p>
<h2 class="groupheader">Typedef Documentation</h2>
<a id="ga5a70527c0861c2ffa3d29333a6aa7f8e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga5a70527c0861c2ffa3d29333a6aa7f8e">&sect;&nbsp;</a></span>lws_spa_fileupload_cb</h2>
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<td class="memname">typedef int(* lws_spa_fileupload_cb) (void *data, const char *name, const char *filename, char *buf, int len, enum <a class="el" href="group__form-parsing.html#ga41a74a822771d3dce89751aa3bce28ae">lws_spa_fileupload_states</a> state)</td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p><a class="el" href="group__form-parsing.html#ga5a70527c0861c2ffa3d29333a6aa7f8e">lws_spa_fileupload_cb()</a> - callback to receive file upload data</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">data</td><td>opt_data pointer set in lws_spa_create </td></tr>
<tr><td class="paramname">name</td><td>name of the form field being uploaded </td></tr>
<tr><td class="paramname">filename</td><td>original filename from client </td></tr>
<tr><td class="paramname">buf</td><td>start of data to receive </td></tr>
<tr><td class="paramname">len</td><td>length of data to receive </td></tr>
<tr><td class="paramname">state</td><td>information about how this call relates to file</td></tr>
</table>
</dd>
</dl>
<p>Notice name and filename shouldn't be trusted, as they are passed from HTTP provided by the client. </p>
</div>
</div>
<h2 class="groupheader">Enumeration Type Documentation</h2>
<a id="ga41a74a822771d3dce89751aa3bce28ae"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga41a74a822771d3dce89751aa3bce28ae">&sect;&nbsp;</a></span>lws_spa_fileupload_states</h2>
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<td class="memname">enum <a class="el" href="group__form-parsing.html#ga41a74a822771d3dce89751aa3bce28ae">lws_spa_fileupload_states</a></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p>enum lws_spa_fileupload_states </p>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="gga41a74a822771d3dce89751aa3bce28aead3a958e7719ac273c3ba4f684f00c87f"></a>LWS_UFS_CONTENT&#160;</td><td class="fielddoc"><p>a chunk of file content has arrived </p>
</td></tr>
<tr><td class="fieldname"><a id="gga41a74a822771d3dce89751aa3bce28aea6ce2a55a4c3695cdb640c893d95bd3a7"></a>LWS_UFS_FINAL_CONTENT&#160;</td><td class="fielddoc"><p>the last chunk (possibly zero length) of file content has arrived </p>
</td></tr>
<tr><td class="fieldname"><a id="gga41a74a822771d3dce89751aa3bce28aea2d25de44865bd44e5a3903a2bab9ca83"></a>LWS_UFS_OPEN&#160;</td><td class="fielddoc"><p>a new file is starting to arrive </p>
</td></tr>
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<div class="fragment"><div class="line"><a name="l02883"></a><span class="lineno"> 2883</span>&#160; {</div><div class="line"><a name="l02884"></a><span class="lineno"> 2884</span>&#160; <a class="code" href="group__form-parsing.html#gga41a74a822771d3dce89751aa3bce28aead3a958e7719ac273c3ba4f684f00c87f">LWS_UFS_CONTENT</a>,</div><div class="line"><a name="l02886"></a><span class="lineno"> 2886</span>&#160; <a class="code" href="group__form-parsing.html#gga41a74a822771d3dce89751aa3bce28aea6ce2a55a4c3695cdb640c893d95bd3a7">LWS_UFS_FINAL_CONTENT</a>,</div><div class="line"><a name="l02888"></a><span class="lineno"> 2888</span>&#160; <a class="code" href="group__form-parsing.html#gga41a74a822771d3dce89751aa3bce28aea2d25de44865bd44e5a3903a2bab9ca83">LWS_UFS_OPEN</a></div><div class="line"><a name="l02890"></a><span class="lineno"> 2890</span>&#160;};</div><div class="ttc" id="group__form-parsing_html_gga41a74a822771d3dce89751aa3bce28aea6ce2a55a4c3695cdb640c893d95bd3a7"><div class="ttname"><a href="group__form-parsing.html#gga41a74a822771d3dce89751aa3bce28aea6ce2a55a4c3695cdb640c893d95bd3a7">LWS_UFS_FINAL_CONTENT</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:2886</div></div>
<div class="ttc" id="group__form-parsing_html_gga41a74a822771d3dce89751aa3bce28aea2d25de44865bd44e5a3903a2bab9ca83"><div class="ttname"><a href="group__form-parsing.html#gga41a74a822771d3dce89751aa3bce28aea2d25de44865bd44e5a3903a2bab9ca83">LWS_UFS_OPEN</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:2888</div></div>
<div class="ttc" id="group__form-parsing_html_gga41a74a822771d3dce89751aa3bce28aead3a958e7719ac273c3ba4f684f00c87f"><div class="ttname"><a href="group__form-parsing.html#gga41a74a822771d3dce89751aa3bce28aead3a958e7719ac273c3ba4f684f00c87f">LWS_UFS_CONTENT</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:2884</div></div>
</div><!-- fragment -->
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="ga162f86762173a2bc8c28497941d74815"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga162f86762173a2bc8c28497941d74815">&sect;&nbsp;</a></span>lws_spa_create()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN struct lws_spa* lws_spa_create </td>
<td>(</td>
<td class="paramtype">struct lws *&#160;</td>
<td class="paramname"><em>wsi</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *const *&#160;</td>
<td class="paramname"><em>param_names</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>count_params</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>max_storage</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__form-parsing.html#ga5a70527c0861c2ffa3d29333a6aa7f8e">lws_spa_fileupload_cb</a>&#160;</td>
<td class="paramname"><em>opt_cb</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>opt_data</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p><a class="el" href="group__form-parsing.html#ga162f86762173a2bc8c28497941d74815">lws_spa_create()</a> - create urldecode parser</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">wsi</td><td>lws connection (used to find Content Type) </td></tr>
<tr><td class="paramname">param_names</td><td>array of form parameter names, like "username" </td></tr>
<tr><td class="paramname">count_params</td><td>count of param_names </td></tr>
<tr><td class="paramname">max_storage</td><td>total amount of form parameter values we can store </td></tr>
<tr><td class="paramname">opt_cb</td><td>NULL, or callback to receive file upload data. </td></tr>
<tr><td class="paramname">opt_data</td><td>NULL, or user pointer provided to opt_cb.</td></tr>
</table>
</dd>
</dl>
<p>Creates a urldecode parser and initializes it.</p>
<p>opt_cb can be NULL if you just want normal name=value parsing, however if one or more entries in your form are bulk data (file transfer), you can provide this callback and filter on the name callback parameter to treat that urldecoded data separately. The callback should return -1 in case of fatal error, and 0 if OK. </p>
</div>
</div>
<a id="gaaa482f07dad3f04b391cccf0a814e13b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaaa482f07dad3f04b391cccf0a814e13b">&sect;&nbsp;</a></span>lws_spa_destroy()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN int lws_spa_destroy </td>
<td>(</td>
<td class="paramtype">struct lws_spa *&#160;</td>
<td class="paramname"><em>spa</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p><a class="el" href="group__form-parsing.html#gaaa482f07dad3f04b391cccf0a814e13b">lws_spa_destroy()</a> - destroy parser object</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">spa</td><td>the parser object previously created </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="ga83835bf250ee3d4a60f36a182f2b8d24"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga83835bf250ee3d4a60f36a182f2b8d24">&sect;&nbsp;</a></span>lws_spa_finalize()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN int lws_spa_finalize </td>
<td>(</td>
<td class="paramtype">struct lws_spa *&#160;</td>
<td class="paramname"><em>spa</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p><a class="el" href="group__form-parsing.html#ga83835bf250ee3d4a60f36a182f2b8d24">lws_spa_finalize()</a> - indicate incoming data completed</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">spa</td><td>the parser object previously created </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="ga3fbe378632f85ec9a14cc2c1687bf05f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga3fbe378632f85ec9a14cc2c1687bf05f">&sect;&nbsp;</a></span>lws_spa_get_length()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN int lws_spa_get_length </td>
<td>(</td>
<td class="paramtype">struct lws_spa *&#160;</td>
<td class="paramname"><em>spa</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>n</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p><a class="el" href="group__form-parsing.html#ga3fbe378632f85ec9a14cc2c1687bf05f">lws_spa_get_length()</a> - return length of parameter value</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">spa</td><td>the parser object previously created </td></tr>
<tr><td class="paramname">n</td><td>parameter ordinal to return length of value for </td></tr>
</table>
</dd>
</dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga2da476217166da02704b90d3a8d4f3cd">&sect;&nbsp;</a></span>lws_spa_get_string()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN const char* lws_spa_get_string </td>
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<td class="paramtype">struct lws_spa *&#160;</td>
<td class="paramname"><em>spa</em>, </td>
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<td class="paramtype">int&#160;</td>
<td class="paramname"><em>n</em>&#160;</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__form-parsing.html#ga2da476217166da02704b90d3a8d4f3cd">lws_spa_get_string()</a> - return pointer to parameter value </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">spa</td><td>the parser object previously created </td></tr>
<tr><td class="paramname">n</td><td>parameter ordinal to return pointer to value for </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#ga9ad9ebf5ea1a7108415ed7e04cb231d2">&sect;&nbsp;</a></span>lws_spa_process()</h2>
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<td class="memname">LWS_VISIBLE LWS_EXTERN int lws_spa_process </td>
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<td class="paramtype">struct lws_spa *&#160;</td>
<td class="paramname"><em>spa</em>, </td>
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<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>in</em>, </td>
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<td class="paramtype">int&#160;</td>
<td class="paramname"><em>len</em>&#160;</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__form-parsing.html#ga9ad9ebf5ea1a7108415ed7e04cb231d2">lws_spa_process()</a> - parses a chunk of input data</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">spa</td><td>the parser object previously created </td></tr>
<tr><td class="paramname">in</td><td>incoming, urlencoded data </td></tr>
<tr><td class="paramname">len</td><td>count of bytes valid at </td></tr>
<tr><td class="paramname">in</td><td></td></tr>
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