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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="projectbrief">Lightweight C library for HTML5 websockets</div>
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Data Structures</h2></td></tr>
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<tr class="memitem:ga96f3dbad54b2853969cfa933d66871ce"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__client.html#ga96f3dbad54b2853969cfa933d66871ce">lws_client_connect_ssl_connection_flags</a> { <b>LCCSCF_USE_SSL</b> = (1 &lt;&lt; 0),
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Functions</h2></td></tr>
<tr class="memitem:ga0c966136905f467816307cfba6deb5fd"><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__client.html#ga0c966136905f467816307cfba6deb5fd">lws_client_connect_via_info</a> (struct <a class="el" href="structlws__client__connect__info.html">lws_client_connect_info</a> *ccinfo)</td></tr>
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<tr class="memitem:ga4af0a20108a95e8b6d94dd4d80055ff3"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN struct lws *LWS_WARN_UNUSED_RESULT&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__client.html#ga4af0a20108a95e8b6d94dd4d80055ff3">lws_client_connect</a> (struct lws_context *clients, const char *address, int port, int ssl_connection, const char *path, const char *host, const char *origin, const char *protocol, int ietf_version_or_minus_one) LWS_WARN_DEPRECATED</td></tr>
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LWS_VISIBLE LWS_EXTERN int&#160;</td><td class="memItemRight" valign="bottom"><b>lws_http_client_read</b> (struct lws *wsi, char **buf, int *len)</td></tr>
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LWS_VISIBLE LWS_EXTERN void&#160;</td><td class="memItemRight" valign="bottom"><b>lws_client_http_body_pending</b> (struct lws *wsi, int something_left_to_send)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2>Client releated functions</h2>
<h2 class="groupheader">Enumeration Type Documentation</h2>
<a id="ga96f3dbad54b2853969cfa933d66871ce"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga96f3dbad54b2853969cfa933d66871ce">&sect;&nbsp;</a></span>lws_client_connect_ssl_connection_flags</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">enum <a class="el" href="group__client.html#ga96f3dbad54b2853969cfa933d66871ce">lws_client_connect_ssl_connection_flags</a></td>
</tr>
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<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p>enum lws_client_connect_ssl_connection_flags - flags that may be used with struct <a class="el" href="structlws__client__connect__info.html">lws_client_connect_info</a> ssl_connection member to control if and how SSL checks apply to the client connection being created </p>
<div class="fragment"><div class="line"><a name="l02039"></a><span class="lineno"> 2039</span>&#160; {</div><div class="line"><a name="l02040"></a><span class="lineno"> 2040</span>&#160; LCCSCF_USE_SSL = (1 &lt;&lt; 0),</div><div class="line"><a name="l02041"></a><span class="lineno"> 2041</span>&#160; LCCSCF_ALLOW_SELFSIGNED = (1 &lt;&lt; 1),</div><div class="line"><a name="l02042"></a><span class="lineno"> 2042</span>&#160; LCCSCF_SKIP_SERVER_CERT_HOSTNAME_CHECK = (1 &lt;&lt; 2),</div><div class="line"><a name="l02043"></a><span class="lineno"> 2043</span>&#160; LCCSCF_ALLOW_EXPIRED = (1 &lt;&lt; 3)</div><div class="line"><a name="l02044"></a><span class="lineno"> 2044</span>&#160;};</div></div><!-- fragment -->
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="ga4af0a20108a95e8b6d94dd4d80055ff3"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga4af0a20108a95e8b6d94dd4d80055ff3">&sect;&nbsp;</a></span>lws_client_connect()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">LWS_VISIBLE LWS_EXTERN struct lws* LWS_WARN_UNUSED_RESULT lws_client_connect </td>
<td>(</td>
<td class="paramtype">struct lws_context *&#160;</td>
<td class="paramname"><em>clients</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>address</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>port</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>ssl_connection</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>path</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>host</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>origin</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>protocol</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>ietf_version_or_minus_one</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__client.html#ga4af0a20108a95e8b6d94dd4d80055ff3">lws_client_connect()</a> - Connect to another websocket server </p><dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000002">Deprecated:</a></b></dt><dd>DEPRECATED use lws_client_connect_via_info </dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">clients</td><td>Websocket context </td></tr>
<tr><td class="paramname">address</td><td>Remote server address, eg, "myserver.com" </td></tr>
<tr><td class="paramname">port</td><td>Port to connect to on the remote server, eg, 80 </td></tr>
<tr><td class="paramname">ssl_connection</td><td>0 = ws://, 1 = wss:// encrypted, 2 = wss:// allow self signed certs </td></tr>
<tr><td class="paramname">path</td><td>Websocket path on server </td></tr>
<tr><td class="paramname">host</td><td>Hostname on server </td></tr>
<tr><td class="paramname">origin</td><td>Socket origin name </td></tr>
<tr><td class="paramname">protocol</td><td>Comma-separated list of protocols being asked for from the server, or just one. The server will pick the one it likes best. If you don't want to specify a protocol, which is legal, use NULL here. </td></tr>
<tr><td class="paramname">ietf_version_or_minus_one</td><td>-1 to ask to connect using the default, latest protocol supported, or the specific protocol ordinal</td></tr>
</table>
</dd>
</dl>
<p>This function creates a connection to a remote server </p>
</div>
</div>
<a id="gac6a8558b4410961a880241c2ac1271e2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gac6a8558b4410961a880241c2ac1271e2">&sect;&nbsp;</a></span>lws_client_connect_extended()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">LWS_VISIBLE LWS_EXTERN struct lws* LWS_WARN_UNUSED_RESULT lws_client_connect_extended </td>
<td>(</td>
<td class="paramtype">struct lws_context *&#160;</td>
<td class="paramname"><em>clients</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>address</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>port</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>ssl_connection</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>path</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>host</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>origin</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>protocol</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>ietf_version_or_minus_one</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void *&#160;</td>
<td class="paramname"><em>userdata</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__client.html#gac6a8558b4410961a880241c2ac1271e2">lws_client_connect_extended()</a> - Connect to another websocket server </p><dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000003">Deprecated:</a></b></dt><dd>DEPRECATED use lws_client_connect_via_info </dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">clients</td><td>Websocket context </td></tr>
<tr><td class="paramname">address</td><td>Remote server address, eg, "myserver.com" </td></tr>
<tr><td class="paramname">port</td><td>Port to connect to on the remote server, eg, 80 </td></tr>
<tr><td class="paramname">ssl_connection</td><td>0 = ws://, 1 = wss:// encrypted, 2 = wss:// allow self signed certs </td></tr>
<tr><td class="paramname">path</td><td>Websocket path on server </td></tr>
<tr><td class="paramname">host</td><td>Hostname on server </td></tr>
<tr><td class="paramname">origin</td><td>Socket origin name </td></tr>
<tr><td class="paramname">protocol</td><td>Comma-separated list of protocols being asked for from the server, or just one. The server will pick the one it likes best. </td></tr>
<tr><td class="paramname">ietf_version_or_minus_one</td><td>-1 to ask to connect using the default, latest protocol supported, or the specific protocol ordinal </td></tr>
<tr><td class="paramname">userdata</td><td>Pre-allocated user data <pre class="fragment"> This function creates a connection to a remote server</pre> </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="ga0c966136905f467816307cfba6deb5fd"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga0c966136905f467816307cfba6deb5fd">&sect;&nbsp;</a></span>lws_client_connect_via_info()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">LWS_VISIBLE LWS_EXTERN struct lws* lws_client_connect_via_info </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structlws__client__connect__info.html">lws_client_connect_info</a> *&#160;</td>
<td class="paramname"><em>ccinfo</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__client.html#ga0c966136905f467816307cfba6deb5fd">lws_client_connect_via_info()</a> - Connect to another websocket server </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ccinfo</td><td>pointer to <a class="el" href="structlws__client__connect__info.html">lws_client_connect_info</a> struct <pre class="fragment"> This function creates a connection to a remote server using the
information provided in ccinfo.</pre> </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="ga715efffc0c4e8fbf72a4293008eb2187"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga715efffc0c4e8fbf72a4293008eb2187">&sect;&nbsp;</a></span>lws_http_client_http_response()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">LWS_VISIBLE LWS_EXTERN unsigned int lws_http_client_http_response </td>
<td>(</td>
<td class="paramtype">struct lws *&#160;</td>
<td class="paramname"><em>wsi</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__client.html#ga715efffc0c4e8fbf72a4293008eb2187">lws_http_client_http_response()</a> - get last HTTP response code</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">wsi</td><td>client connection</td></tr>
</table>
</dd>
</dl>
<p>Returns the last server response code, eg, 200 for client http connections. </p>
</div>
</div>
<a id="ga4f44b8230e6732816ca5cd8d1aaaf340"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga4f44b8230e6732816ca5cd8d1aaaf340">&sect;&nbsp;</a></span>lws_init_vhost_client_ssl()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">LWS_VISIBLE LWS_EXTERN int lws_init_vhost_client_ssl </td>
<td>(</td>
<td class="paramtype">const struct <a class="el" href="structlws__context__creation__info.html">lws_context_creation_info</a> *&#160;</td>
<td class="paramname"><em>info</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">struct lws_vhost *&#160;</td>
<td class="paramname"><em>vhost</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__client.html#ga4f44b8230e6732816ca5cd8d1aaaf340">lws_init_vhost_client_ssl()</a> - also enable client SSL on an existing vhost</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">info</td><td>client ssl related info </td></tr>
<tr><td class="paramname">vhost</td><td>which vhost to initialize client ssl operations on</td></tr>
</table>
</dd>
</dl>
<p>You only need to call this if you plan on using SSL client connections on the vhost. For non-SSL client connections, it's not necessary to call this.</p>
<p>The following members of info are used during the call </p><pre class="fragment"> - options must have LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT set,
otherwise the call does nothing
- provided_client_ssl_ctx must be NULL to get a generated client
ssl context, otherwise you can pass a prepared one in by setting it
- ssl_cipher_list may be NULL or set to the client valid cipher list
- ssl_ca_filepath may be NULL or client cert filepath
- ssl_cert_filepath may be NULL or client cert filepath
- ssl_private_key_filepath may be NULL or client cert private key
</pre><p>You must create your vhost explicitly if you want to use this, so you have a pointer to the vhost. Create the context first with the option flag LWS_SERVER_OPTION_EXPLICIT_VHOSTS and then call <a class="el" href="group__context-and-vhost.html#ga0c54c667ccd9b8b3dddcd123ca72f87c">lws_create_vhost()</a> with the same info struct. </p>
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