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  1. or download this
      $SIG{"ALRM"} = sub { print "TIME_OUT! at $timeout\n"; exit; };
  alarm ($timeout);
  2. or download this
      $SIG{"ALRM"} = sub { next; };
  alarm($timeout);
  3. or download this
      $SIG{"ALRM"} = sub { next; };
  alarm($timeout);