Messages in this thread | | | Date | Fri, 6 Jul 2007 08:35:46 +0200 | From | "Jesper Juhl" <> | Subject | Re: kill -9? |
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On 06/07/07, Kaleem Khan <linuxuser8@gmail.com> wrote: > Hello Kernel experts, > > I'd like to know whether there's a way to take some action (say > calling a routine) in > response to 'kill -9' before the process is terminated. I tend to > think it's against 'kill -9' > UNIX/Linux philosophy but still I'd like to confirm. > You can't catch/block SIGKILL (9), but you can catch SIGTERM (15 - what kill sends by default).
A well behaved app should catch SIGTERM and do proper cleanup before shutdown so that when a user does kill <pid_of_app> it shuts down cleanly. kill -9 <pid_of_app> shouldn't normally be needed - it is for emergency termination of the app, which is why you can't catch it.
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