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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Passenger: AgentWatcher Class Reference</title>
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<h1>AgentWatcher Class Reference</h1><!-- doxytag: class="AgentWatcher" -->Abstract base class for watching agent processes.
<a href="#_details">More...</a>
<p>
Inherited by HelperAgentWatcher, and LoggingAgentWatcher.
<p>
<p>
<a href="classAgentWatcher-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#a9f83ed13b06ef80d0417f9c313cf61e">sendStartupInfo</a> (<a class="el" href="classPassenger_1_1MessageChannel.html">MessageChannel</a> &channel)=0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Send the started agent process's startup information over the given channel, to the starter process. <a href="#a9f83ed13b06ef80d0417f9c313cf61e"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#982a388ed5c485ab9615c5bc0abbc71e">name</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the name of the agent that this class is watching. <a href="#982a388ed5c485ab9615c5bc0abbc71e"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual pid_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#daf1c0a7104aea662d90f639066b8247">start</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Starts the agent process. <a href="#daf1c0a7104aea662d90f639066b8247"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#3da11d23ed3b1210a24844856b7f3159">startWatching</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Start watching the agent process. <a href="#3da11d23ed3b1210a24844856b7f3159"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#e65876d2cc680b739dfee02378233340">forceShutdown</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Force the agent process to shut down. <a href="#e65876d2cc680b739dfee02378233340"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">string </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#b99d4346d7b69d86db1b14206e7caadb">getErrorMessage</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">If the watcher thread has encountered an error, then the error message will be stored here. <a href="#b99d4346d7b69d86db1b14206e7caadb"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="80ef9eaf1a84d994e7ba5f1507616fde"></a><!-- doxytag: member="AgentWatcher::getErrorBacktrace" ref="80ef9eaf1a84d994e7ba5f1507616fde" args="() const " -->
string </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#80ef9eaf1a84d994e7ba5f1507616fde">getErrorBacktrace</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The error backtrace, if applicable. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="classPassenger_1_1FileDescriptor.html">FileDescriptor</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#c0749ab103ed5d1adc81b53a7ddc93d8">getFeedbackFd</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the agent process feedback fd, or NULL if the agent process hasn't been started yet. <a href="#c0749ab103ed5d1adc81b53a7ddc93d8"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual string </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#77279925d786a774bdf097468c36af96">getExeFilename</a> () const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the filename of the agent process's executable. <a href="#77279925d786a774bdf097468c36af96"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#c6325cb940f9c25ef2f44aca00c30755">execProgram</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">This method is to exec() the agent with the right arguments. <a href="#c6325cb940f9c25ef2f44aca00c30755"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#45bc0e41253a0c287e14f708f7dba1e6">sendStartupArguments</a> (pid_t <a class="el" href="classAgentWatcher.html#76de201bbc7111c01c31668211494fa8">pid</a>, <a class="el" href="classPassenger_1_1FileDescriptor.html">FileDescriptor</a> &fd)=0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">This method is to send startup arguments to the agent process through the given file descriptor, which is the agent process's feedback fd. <a href="#45bc0e41253a0c287e14f708f7dba1e6"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#4c1c454374c8916788fee166beacfb05">processStartupInfo</a> (pid_t <a class="el" href="classAgentWatcher.html#76de201bbc7111c01c31668211494fa8">pid</a>, <a class="el" href="classPassenger_1_1FileDescriptor.html">FileDescriptor</a> &fd, const vector< string > &args)=0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">This method is to process the startup info that the agent process has sent back. <a href="#4c1c454374c8916788fee166beacfb05"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#a358a05d41db4ddab9696727849e0d4c">killAndWait</a> (pid_t <a class="el" href="classAgentWatcher.html#76de201bbc7111c01c31668211494fa8">pid</a>)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Kill a process with SIGKILL, and attempt to kill its children too. <a href="#a358a05d41db4ddab9696727849e0d4c"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">pid_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#76de201bbc7111c01c31668211494fa8">pid</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">PID of the process we're watching. <a href="#76de201bbc7111c01c31668211494fa8"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">string </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#c4fa4122858073a1e3e1d96ce2ade6f2">threadExceptionMessage</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">If the watcher thread threw an uncaught exception then its information will be stored here so that the main thread can check whether a watcher encountered an error. <a href="#c4fa4122858073a1e3e1d96ce2ade6f2"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classPassenger_1_1FileDescriptor.html">FileDescriptor</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#a3eba8fe19117a84764f5f653a03612d">feedbackFd</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The agent process's feedback fd. <a href="#a3eba8fe19117a84764f5f653a03612d"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="22ad2ee317c4e254833ab07f377ed7fd"></a><!-- doxytag: member="AgentWatcher::lock" ref="22ad2ee317c4e254833ab07f377ed7fd" args="" -->
boost::mutex </td><td class="memItemRight" valign="bottom"><a class="el" href="classAgentWatcher.html#22ad2ee317c4e254833ab07f377ed7fd">lock</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Lock for protecting the exchange of data between the main thread and the watcher thread. <br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Abstract base class for watching agent processes. <hr><h2>Member Function Documentation</h2>
<a class="anchor" name="c6325cb940f9c25ef2f44aca00c30755"></a><!-- doxytag: member="AgentWatcher::execProgram" ref="c6325cb940f9c25ef2f44aca00c30755" args="() const " -->
<div class="memitem">
<div class="memproto">
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<td class="memname">virtual void AgentWatcher::execProgram </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline, protected, virtual]</code></td>
</tr>
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<p>
This method is to exec() the agent with the right arguments.
<p>
It is called from within a forked child process, so don't do any dynamic memory allocations in here. It must also not throw any exceptions. It must also preserve the value of errno after exec() is called.
</div>
</div><p>
<a class="anchor" name="e65876d2cc680b739dfee02378233340"></a><!-- doxytag: member="AgentWatcher::forceShutdown" ref="e65876d2cc680b739dfee02378233340" args="()" -->
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<td class="memname">virtual bool AgentWatcher::forceShutdown </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [inline, virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Force the agent process to shut down.
<p>
Returns true if it was shut down, or false if it wasn't started.
</div>
</div><p>
<a class="anchor" name="b99d4346d7b69d86db1b14206e7caadb"></a><!-- doxytag: member="AgentWatcher::getErrorMessage" ref="b99d4346d7b69d86db1b14206e7caadb" args="() const " -->
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<td class="memname">string AgentWatcher::getErrorMessage </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
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<p>
If the watcher thread has encountered an error, then the error message will be stored here.
<p>
If the error message is empty then it means everything is still OK.
</div>
</div><p>
<a class="anchor" name="77279925d786a774bdf097468c36af96"></a><!-- doxytag: member="AgentWatcher::getExeFilename" ref="77279925d786a774bdf097468c36af96" args="() const =0" -->
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<td class="memname">virtual string AgentWatcher::getExeFilename </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [protected, pure virtual]</code></td>
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<p>
Returns the filename of the agent process's executable.
<p>
This method may be called in a forked child process and may therefore not allocate memory.
</div>
</div><p>
<a class="anchor" name="c0749ab103ed5d1adc81b53a7ddc93d8"></a><!-- doxytag: member="AgentWatcher::getFeedbackFd" ref="c0749ab103ed5d1adc81b53a7ddc93d8" args="() const " -->
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<td class="memname">const <a class="el" href="classPassenger_1_1FileDescriptor.html">FileDescriptor</a> AgentWatcher::getFeedbackFd </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
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<p>
Returns the agent process feedback fd, or NULL if the agent process hasn't been started yet.
<p>
Can be used to check whether this agent process has exited without using waitpid().
</div>
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<a class="anchor" name="a358a05d41db4ddab9696727849e0d4c"></a><!-- doxytag: member="AgentWatcher::killAndWait" ref="a358a05d41db4ddab9696727849e0d4c" args="(pid_t pid)" -->
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<td class="memname">void AgentWatcher::killAndWait </td>
<td>(</td>
<td class="paramtype">pid_t </td>
<td class="paramname"> <em>pid</em> </td>
<td> ) </td>
<td><code> [inline, protected]</code></td>
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<p>
Kill a process with SIGKILL, and attempt to kill its children too.
<p>
Then wait until it has quit.
</div>
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<a class="anchor" name="982a388ed5c485ab9615c5bc0abbc71e"></a><!-- doxytag: member="AgentWatcher::name" ref="982a388ed5c485ab9615c5bc0abbc71e" args="() const =0" -->
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<td class="memname">virtual const char* AgentWatcher::name </td>
<td>(</td>
<td class="paramname"> </td>
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<td> const<code> [pure virtual]</code></td>
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Returns the name of the agent that this class is watching.
<p>
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<a class="anchor" name="4c1c454374c8916788fee166beacfb05"></a><!-- doxytag: member="AgentWatcher::processStartupInfo" ref="4c1c454374c8916788fee166beacfb05" args="(pid_t pid, FileDescriptor &fd, const vector< string > &args)=0" -->
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<td class="memname">virtual bool AgentWatcher::processStartupInfo </td>
<td>(</td>
<td class="paramtype">pid_t </td>
<td class="paramname"> <em>pid</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classPassenger_1_1FileDescriptor.html">FileDescriptor</a> & </td>
<td class="paramname"> <em>fd</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const vector< string > & </td>
<td class="paramname"> <em>args</em></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td><code> [protected, pure virtual]</code></td>
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<p>
This method is to process the startup info that the agent process has sent back.
<p>
May throw arbitrary exceptions.
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<a class="anchor" name="45bc0e41253a0c287e14f708f7dba1e6"></a><!-- doxytag: member="AgentWatcher::sendStartupArguments" ref="45bc0e41253a0c287e14f708f7dba1e6" args="(pid_t pid, FileDescriptor &fd)=0" -->
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<td class="memname">virtual void AgentWatcher::sendStartupArguments </td>
<td>(</td>
<td class="paramtype">pid_t </td>
<td class="paramname"> <em>pid</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classPassenger_1_1FileDescriptor.html">FileDescriptor</a> & </td>
<td class="paramname"> <em>fd</em></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td><code> [protected, pure virtual]</code></td>
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<p>
This method is to send startup arguments to the agent process through the given file descriptor, which is the agent process's feedback fd.
<p>
May throw arbitrary exceptions.
</div>
</div><p>
<a class="anchor" name="a9f83ed13b06ef80d0417f9c313cf61e"></a><!-- doxytag: member="AgentWatcher::sendStartupInfo" ref="a9f83ed13b06ef80d0417f9c313cf61e" args="(MessageChannel &channel)=0" -->
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<td class="memname">virtual void AgentWatcher::sendStartupInfo </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classPassenger_1_1MessageChannel.html">MessageChannel</a> & </td>
<td class="paramname"> <em>channel</em> </td>
<td> ) </td>
<td><code> [pure virtual]</code></td>
</tr>
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<p>
Send the started agent process's startup information over the given channel, to the starter process.
<p>
May throw arbitrary exceptions.<p>
<dl class="pre" compact><dt><b>Precondition:</b></dt><dd><a class="el" href="classAgentWatcher.html#daf1c0a7104aea662d90f639066b8247" title="Starts the agent process.">start()</a> has been called and succeeded. </dd></dl>
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<a class="anchor" name="daf1c0a7104aea662d90f639066b8247"></a><!-- doxytag: member="AgentWatcher::start" ref="daf1c0a7104aea662d90f639066b8247" args="()" -->
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<td class="memname">virtual pid_t AgentWatcher::start </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [inline, virtual]</code></td>
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<p>
Starts the agent process.
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May throw arbitrary exceptions.
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<a class="anchor" name="3da11d23ed3b1210a24844856b7f3159"></a><!-- doxytag: member="AgentWatcher::startWatching" ref="3da11d23ed3b1210a24844856b7f3159" args="()" -->
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<td class="memname">virtual void AgentWatcher::startWatching </td>
<td>(</td>
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<td><code> [inline, virtual]</code></td>
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<p>
Start watching the agent process.
<p>
<dl class="pre" compact><dt><b>Precondition:</b></dt><dd><a class="el" href="classAgentWatcher.html#daf1c0a7104aea662d90f639066b8247" title="Starts the agent process.">start()</a> has been called and succeeded. <p>
This watcher isn't already watching. </dd></dl>
<dl compact><dt><b>Exceptions:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>RuntimeException</em> </td><td>If a precondition failed. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>thread_interrupted</em> </td><td></td></tr>
<tr><td valign="top"></td><td valign="top"><em>thread_resource_error</em> </td><td></td></tr>
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<hr><h2>Member Data Documentation</h2>
<a class="anchor" name="a3eba8fe19117a84764f5f653a03612d"></a><!-- doxytag: member="AgentWatcher::feedbackFd" ref="a3eba8fe19117a84764f5f653a03612d" args="" -->
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<td class="memname"><a class="el" href="classPassenger_1_1FileDescriptor.html">FileDescriptor</a> <a class="el" href="classAgentWatcher.html#a3eba8fe19117a84764f5f653a03612d">AgentWatcher::feedbackFd</a><code> [protected]</code> </td>
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<p>
The agent process's feedback fd.
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<a class="anchor" name="76de201bbc7111c01c31668211494fa8"></a><!-- doxytag: member="AgentWatcher::pid" ref="76de201bbc7111c01c31668211494fa8" args="" -->
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<td class="memname">pid_t <a class="el" href="classAgentWatcher.html#76de201bbc7111c01c31668211494fa8">AgentWatcher::pid</a><code> [protected]</code> </td>
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<p>
PID of the process we're watching.
<p>
0 if no process is started at this time.
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<a class="anchor" name="c4fa4122858073a1e3e1d96ce2ade6f2"></a><!-- doxytag: member="AgentWatcher::threadExceptionMessage" ref="c4fa4122858073a1e3e1d96ce2ade6f2" args="" -->
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<td class="memname">string <a class="el" href="classAgentWatcher.html#c4fa4122858073a1e3e1d96ce2ade6f2">AgentWatcher::threadExceptionMessage</a><code> [protected]</code> </td>
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If the watcher thread threw an uncaught exception then its information will be stored here so that the main thread can check whether a watcher encountered an error.
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These are empty strings if everything is OK.
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</div><p>
<hr>The documentation for this class was generated from the following file:<ul>
<li>Watchdog.cpp</ul>
</div>
<hr size="1"><address style="text-align: right;"><small>Generated on Sun Feb 21 12:22:46 2010 for Passenger by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.8 </small></address>
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