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POSending an arbitrary Signal in Windows?
 

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  1. POSending an arbitrary Signal in Windows?
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    <p>Linux supports sending an arbitrary Posix-Signal such as <code>SIGINT</code> or <code>SIGTERM</code> to a process using the <code>kill</code>-Command. While <code>SIGINT</code> and <code>SIGTERM</code> are just boring old ways to end a process in a friendly or not-so-friendly kind of way, <code>SIGQUIT</code> is meant to trigger a core dump. This can be used to trigger a running Java VM to print out a thread dump, including the stacktraces of all running threads -- neat! After printing the debugging info, the Java VM will continue doing whatever it was doing before; in fact the thread dump just happens in another spawned thread of maximum priority. (You can try this out yourself by using <code>kill -3 &lt;VM-PID&gt;</code>.)</p> <p>Note that you can also register your own signal handlers using the (unsupported!) <code>Signal</code> and <code>SignalHandler</code> classes in the <code>sun.misc</code>-package, so you can have all kinds of fun with it.</p> <p><em>However, I have yet to find a way to send a signal to a Windows process.</em> Signals are created by certain user inputs: <code>Ctrl-C</code> triggers a <code>SIGINT</code> on both platforms, for instance. But there does not seem to be any utility to manually send a signal to a running, but non-interactive process on Windows. The obvious solution is to use the Cygwin <code>kill</code> executable, but while it can end Windows processes using the appropriate Windows API, I could not send a <code>SIGBREAK</code> (the Windows equivalent to <code>SIGQUIT</code>) with it; in fact I think the only signal it is able to send to Windows processes is <code>SIGTERM</code>.</p> <p>So, to make a long story short and to repeat the headline: How to I send an arbitrary signal to a process in Windows?</p>
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    1. COI was looking to generate a stack dump myself... it's too bad Sun didn't add that possibility to do this from the Java tray icon.
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    2. COSun warns against using classes in the com.sun hierarchy simply because they can (and do) arbitrarily change between versions and sometimes even between platforms.
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    3. COI know that, that's why I wrote unsupported (exclamation mark). It was just meant as an aside and isn't central to the question.
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