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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="#nested-classes">Data Structures</a> &#124;
<a href="#enum-members">Enumerations</a> &#124;
<a href="#func-members">Functions</a> </div>
<div class="headertitle">
<div class="title">Smtp</div> </div>
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Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structlws__email.html">lws_email</a></td></tr>
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Enumerations</h2></td></tr>
<tr class="memitem:ga116be79bf44f9dc2a97f46e051fe4dc0"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__smtp.html#ga116be79bf44f9dc2a97f46e051fe4dc0">lwsgs_smtp_states</a> { <br />
&#160;&#160;<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a29e5b0ecf75375b5a643faa3d6222b7c">LGSSMTP_IDLE</a>,
<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0ab89442b7a3ca2b94c3cdcf33756eb933">LGSSMTP_CONNECTING</a>,
<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0ab61778f70ecac007b334bb14942eb41d">LGSSMTP_CONNECTED</a>,
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&#160;&#160;<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a929bb4623ff3f585108aba2a1b047fab">LGSSMTP_SENT_FROM</a>,
<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0aae20a0cb95b97a70f6b45d0ed2d5be83">LGSSMTP_SENT_TO</a>,
<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a85e3c452950c09a79086bff4b9be5c14">LGSSMTP_SENT_DATA</a>,
<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a38fba41f28d754e38079b31418a86a69">LGSSMTP_SENT_BODY</a>,
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&#160;&#160;<a class="el" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a2c2ed16ffc572326e3040684084b21d5">LGSSMTP_SENT_QUIT</a>
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Functions</h2></td></tr>
<tr class="memitem:ga77fc9b56a1bb39484844981ec375fc29"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__smtp.html#ga77fc9b56a1bb39484844981ec375fc29">lws_email_init</a> (struct <a class="el" href="structlws__email.html">lws_email</a> *email, uv_loop_t *loop, int max_content)</td></tr>
<tr class="separator:ga77fc9b56a1bb39484844981ec375fc29"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga5e535e346d92a9daf00be33abf79d4eb"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__smtp.html#ga5e535e346d92a9daf00be33abf79d4eb">lws_email_check</a> (struct <a class="el" href="structlws__email.html">lws_email</a> *email)</td></tr>
<tr class="separator:ga5e535e346d92a9daf00be33abf79d4eb"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga25298a5afc1074e13b2d5711a86432b2"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__smtp.html#ga25298a5afc1074e13b2d5711a86432b2">lws_email_destroy</a> (struct <a class="el" href="structlws__email.html">lws_email</a> *email)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2>SMTP related functions</h2>
<p>These apis let you communicate with a local SMTP server to send email from lws. It handles all the SMTP sequencing and protocol actions.</p>
<p>Your system should have postfix, sendmail or another MTA listening on port 25 and able to send email using the "mail" commandline app. Usually distro MTAs are configured for this by default.</p>
<p>It runs via its own libuv events if initialized (which requires giving it a libuv loop to attach to).</p>
<p>It operates using three callbacks, on_next() queries if there is a new email to send, on_get_body() asks for the body of the email, and on_sent() is called after the email is successfully sent.</p>
<p>To use it</p>
<ul>
<li>create an <a class="el" href="structlws__email.html">lws_email</a> struct</li>
<li>initialize data, loop, the email_* strings, max_content_size and the callbacks</li>
<li>call <a class="el" href="group__smtp.html#ga77fc9b56a1bb39484844981ec375fc29">lws_email_init()</a></li>
</ul>
<p>When you have at least one email to send, call <a class="el" href="group__smtp.html#ga5e535e346d92a9daf00be33abf79d4eb">lws_email_check()</a> to schedule starting to send it. </p>
<h2 class="groupheader">Enumeration Type Documentation</h2>
<a id="ga116be79bf44f9dc2a97f46e051fe4dc0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga116be79bf44f9dc2a97f46e051fe4dc0">&sect;&nbsp;</a></span>lwsgs_smtp_states</h2>
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<table class="memname">
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<td class="memname">enum <a class="el" href="group__smtp.html#ga116be79bf44f9dc2a97f46e051fe4dc0">lwsgs_smtp_states</a></td>
</tr>
</table>
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<p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
<p>enum lwsgs_smtp_states - where we are in SMTP protocol sequence </p>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0a29e5b0ecf75375b5a643faa3d6222b7c"></a>LGSSMTP_IDLE&#160;</td><td class="fielddoc"><p>awaiting new email </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0ab89442b7a3ca2b94c3cdcf33756eb933"></a>LGSSMTP_CONNECTING&#160;</td><td class="fielddoc"><p>opening tcp connection to MTA </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0ab61778f70ecac007b334bb14942eb41d"></a>LGSSMTP_CONNECTED&#160;</td><td class="fielddoc"><p>tcp connection to MTA is connected </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0a1dfec948a864205cec875f63cbe0d4ad"></a>LGSSMTP_SENT_HELO&#160;</td><td class="fielddoc"><p>sent the HELO </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0a929bb4623ff3f585108aba2a1b047fab"></a>LGSSMTP_SENT_FROM&#160;</td><td class="fielddoc"><p>sent FROM </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0aae20a0cb95b97a70f6b45d0ed2d5be83"></a>LGSSMTP_SENT_TO&#160;</td><td class="fielddoc"><p>sent TO </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0a85e3c452950c09a79086bff4b9be5c14"></a>LGSSMTP_SENT_DATA&#160;</td><td class="fielddoc"><p>sent DATA request </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0a38fba41f28d754e38079b31418a86a69"></a>LGSSMTP_SENT_BODY&#160;</td><td class="fielddoc"><p>sent the email body </p>
</td></tr>
<tr><td class="fieldname"><a id="gga116be79bf44f9dc2a97f46e051fe4dc0a2c2ed16ffc572326e3040684084b21d5"></a>LGSSMTP_SENT_QUIT&#160;</td><td class="fielddoc"><p>sent the session quit </p>
</td></tr>
</table>
<div class="fragment"><div class="line"><a name="l04185"></a><span class="lineno"> 4185</span>&#160; {</div><div class="line"><a name="l04186"></a><span class="lineno"> 4186</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a29e5b0ecf75375b5a643faa3d6222b7c">LGSSMTP_IDLE</a>, </div><div class="line"><a name="l04187"></a><span class="lineno"> 4187</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0ab89442b7a3ca2b94c3cdcf33756eb933">LGSSMTP_CONNECTING</a>, </div><div class="line"><a name="l04188"></a><span class="lineno"> 4188</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0ab61778f70ecac007b334bb14942eb41d">LGSSMTP_CONNECTED</a>, </div><div class="line"><a name="l04189"></a><span class="lineno"> 4189</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a1dfec948a864205cec875f63cbe0d4ad">LGSSMTP_SENT_HELO</a>, </div><div class="line"><a name="l04190"></a><span class="lineno"> 4190</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a929bb4623ff3f585108aba2a1b047fab">LGSSMTP_SENT_FROM</a>, </div><div class="line"><a name="l04191"></a><span class="lineno"> 4191</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0aae20a0cb95b97a70f6b45d0ed2d5be83">LGSSMTP_SENT_TO</a>, </div><div class="line"><a name="l04192"></a><span class="lineno"> 4192</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a85e3c452950c09a79086bff4b9be5c14">LGSSMTP_SENT_DATA</a>, </div><div class="line"><a name="l04193"></a><span class="lineno"> 4193</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a38fba41f28d754e38079b31418a86a69">LGSSMTP_SENT_BODY</a>, </div><div class="line"><a name="l04194"></a><span class="lineno"> 4194</span>&#160; <a class="code" href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a2c2ed16ffc572326e3040684084b21d5">LGSSMTP_SENT_QUIT</a>, </div><div class="line"><a name="l04195"></a><span class="lineno"> 4195</span>&#160;};</div><div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0ab61778f70ecac007b334bb14942eb41d"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0ab61778f70ecac007b334bb14942eb41d">LGSSMTP_CONNECTED</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4188</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0a38fba41f28d754e38079b31418a86a69"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a38fba41f28d754e38079b31418a86a69">LGSSMTP_SENT_BODY</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4193</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0a29e5b0ecf75375b5a643faa3d6222b7c"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a29e5b0ecf75375b5a643faa3d6222b7c">LGSSMTP_IDLE</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4186</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0ab89442b7a3ca2b94c3cdcf33756eb933"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0ab89442b7a3ca2b94c3cdcf33756eb933">LGSSMTP_CONNECTING</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4187</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0aae20a0cb95b97a70f6b45d0ed2d5be83"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0aae20a0cb95b97a70f6b45d0ed2d5be83">LGSSMTP_SENT_TO</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4191</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0a929bb4623ff3f585108aba2a1b047fab"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a929bb4623ff3f585108aba2a1b047fab">LGSSMTP_SENT_FROM</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4190</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0a2c2ed16ffc572326e3040684084b21d5"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a2c2ed16ffc572326e3040684084b21d5">LGSSMTP_SENT_QUIT</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4194</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0a1dfec948a864205cec875f63cbe0d4ad"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a1dfec948a864205cec875f63cbe0d4ad">LGSSMTP_SENT_HELO</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4189</div></div>
<div class="ttc" id="group__smtp_html_gga116be79bf44f9dc2a97f46e051fe4dc0a85e3c452950c09a79086bff4b9be5c14"><div class="ttname"><a href="group__smtp.html#gga116be79bf44f9dc2a97f46e051fe4dc0a85e3c452950c09a79086bff4b9be5c14">LGSSMTP_SENT_DATA</a></div><div class="ttdef"><b>Definition:</b> libwebsockets.h:4192</div></div>
</div><!-- fragment -->
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="ga5e535e346d92a9daf00be33abf79d4eb"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga5e535e346d92a9daf00be33abf79d4eb">&sect;&nbsp;</a></span>lws_email_check()</h2>
<div class="memitem">
<div class="memproto">
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<td class="memname">LWS_VISIBLE LWS_EXTERN void lws_email_check </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structlws__email.html">lws_email</a> *&#160;</td>
<td class="paramname"><em>email</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__smtp.html#ga5e535e346d92a9daf00be33abf79d4eb">lws_email_check()</a> - Request check for new email</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">email</td><td>struct <a class="el" href="structlws__email.html">lws_email</a> context to check</td></tr>
</table>
</dd>
</dl>
<p>Schedules a check for new emails in 1s... call this when you have queued an email for send. </p>
</div>
</div>
<a id="ga25298a5afc1074e13b2d5711a86432b2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga25298a5afc1074e13b2d5711a86432b2">&sect;&nbsp;</a></span>lws_email_destroy()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">LWS_VISIBLE LWS_EXTERN void lws_email_destroy </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structlws__email.html">lws_email</a> *&#160;</td>
<td class="paramname"><em>email</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__smtp.html#ga25298a5afc1074e13b2d5711a86432b2">lws_email_destroy()</a> - stop using the struct <a class="el" href="structlws__email.html">lws_email</a></p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">email</td><td>the struct <a class="el" href="structlws__email.html">lws_email</a> context</td></tr>
</table>
</dd>
</dl>
<p>Stop sending email using email and free allocations </p>
</div>
</div>
<a id="ga77fc9b56a1bb39484844981ec375fc29"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga77fc9b56a1bb39484844981ec375fc29">&sect;&nbsp;</a></span>lws_email_init()</h2>
<div class="memitem">
<div class="memproto">
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<td class="memname">LWS_VISIBLE LWS_EXTERN int lws_email_init </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structlws__email.html">lws_email</a> *&#160;</td>
<td class="paramname"><em>email</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uv_loop_t *&#160;</td>
<td class="paramname"><em>loop</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>max_content</em>&#160;</td>
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<td>)</td>
<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__smtp.html#ga77fc9b56a1bb39484844981ec375fc29">lws_email_init()</a> - Initialize a struct <a class="el" href="structlws__email.html">lws_email</a></p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">email</td><td>struct <a class="el" href="structlws__email.html">lws_email</a> to init </td></tr>
<tr><td class="paramname">loop</td><td>libuv loop to use </td></tr>
<tr><td class="paramname">max_content</td><td>max email content size</td></tr>
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</dd>
</dl>
<p>Prepares a struct <a class="el" href="structlws__email.html">lws_email</a> for use ending SMTP </p>
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