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  • What does the output of ps look like? Commented Apr 9, 2012 at 20:41
  • @Keith: When I do ps aux | grep ping, it gives out the ping process running, if I don't use "kill", they are always there. Commented Apr 9, 2012 at 20:43
  • It may be there, but what's it's status? I'm wondering if you just don't have to wait() on the subprocess (it's a zombie process). Commented Apr 9, 2012 at 20:47
  • @Keith: The status for the remaining thread is "S+", and it is created with another process when the command is issued. Do you think that it's the zombie process? How does that affect my process? Commented Apr 9, 2012 at 20:55
  • That means it really is still running. Commented Apr 9, 2012 at 21:00