look at the function signal. from the man page:

DESCRIPTION
       The  signal  system call installs a new signal handler for
       the signal with number signum.  The signal handler is  set
       to  handler which may be a user specified function, or one
       of the following:

if you need more help than this, i'll be happy to assist you.

--alex--

-- 
| I believe the moment is at hand when, by a paranoiac and active |
|  advance of the mind, it will be possible (simultaneously with  |
|  automatism and other passive states) to systematize confusion  |
|  and thus to help to discredit completely the world of reality. |


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