Re: kill -9?

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On 06/07/07, Kaleem Khan <[email protected]> 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.

--
Jesper Juhl <[email protected]>
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