Hi, I have a program that while the parent process is doing something, child process counts up the run time and displays it. Simplified code woll be something like, 
if($pid=fork){
  while($c = ReadKey){
     doing something... ;
  }
}
else {
  my $count = 0;
  while(1){
     sleep(1);
     print $count++;
  }
}

[download]
Now the problem is when parent process is done or exited, how can I let child process know so that it can exit as well ? And in the first place, I'm not even sure if this is a good way to count the time in parallel with other tasks. In the above code, the first while loop is stopped until some key is typed in, so that I cannot count the run time in that loop, and the best I came up with is having a child process counting the time and displaying it separate from main(parent) process. If there are any better ways, I'd appreciate your suggestion.

In reply to Parent process finished. How to exit the child process. by ybnormal

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