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The hash %SIG is used to define signal handlers (subroutines) used for various signals
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The keys of %SIG are the UNIX names with first SIG removed. For instance, to set handler() as routine that will handle SIGINT interrupts do something like:
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$SIG{'INT'} = 'handler';
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sub handler { # First argument is signal name
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my($sig) = @_;
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print("Signal $sig received -- shutting down\n");
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exit(0);
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}
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kill $signum, $child1, $child2; # sends interrupt $signum to process numbers stored in $child1 and $child2
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$signum is NUMERICAL label (2 for SIGINT) and $child1,2 the child process number as returned by fork or open(PROCESSHANDLE,..) to parent
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