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Catch the kill command?

Posted on 2005-03-14
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Last Modified: 2010-04-22
If my process is running with a PID of 1000, is there a way to catch in my code when someone at the terminal types in:  kill 1000 ?

I want to know this so I can free up used resources, and close up log files.
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Question by:lwinkenb
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4 Comments
 
LVL 4

Expert Comment

by:Robson
ID: 13538059
It's easy to cach a signal:

void sighandler(int number)
{
    printf ("Process is killed!\n");
}

int main()
{
    signal(SIGKILL, sighandler);
    /* rest of your program */
}

But what is exactly that you want? Do you mean that program with pid 1000 is already running and you want to protect it from killing? I don't suppose its possible...
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LVL 5

Author Comment

by:lwinkenb
ID: 13538210
That didn't work.  I tried the above code, and it just said "Terminated" when I killed it.  It didnt say "Process is killed!".

>> Do you mean that program with pid 1000 is already running and you want to protect it from killing?
The program with pid of 1000 is the small program I am writing here.  This is the one that is catching the signal.
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Accepted Solution

by:
Robson earned 1000 total points
ID: 13538313
Ha!

signal(SIGTERM, sighandler);

SIGKILL is actualluy unblockable and you send it with kill -9

:)

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LVL 5

Author Comment

by:lwinkenb
ID: 13538523
Thanks =)
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