I have a sysadmin script which is trying to do a network operations on all ports (1-65k). It uses the system function to call a program which takes about 45 seconds to timeout. To make the script finish in my lifetime, I'd like to shorten the timeout. I have something like this: 
for ($i = 0; $i <= 65535; $i++) {
  print "port $i\n";
  system "this takes 45 seconds to timeout";
}

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I've noticed that pressing the interrupte sequence (^C) will start a new iteration throught the loop. Is it possibel to send the INT signal to the running program? This doesn't seem to work: 
for ($i = 0; $i <= 65535; $i++) {
  print "port $i\n";
  system "this takes 45 seconds to timeout";
  sleep 2;
  kill ('INT', $$);
}

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I think each instance of system() should result in a new PID. Could this be handled by forking, and sending the INT signal from the parent to the child? I'm just not sure where to go. Any advise is appreciated.

In reply to Sending signal to running script by mhearse

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