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#!/usr/bin/perl

...
   $SIG{CHLD} = 'IGNORE';
   exit(1);
}

watchdog -t 7200 perl -le'print("done")'

# Gets terminated
watchdog -t 7200 perl -le'sleep(3*60*60); print("done")'

# Gets killed
watchdog -t 7200 perl -le'$SIG{TERM}="IGNORE"; sleep(10800); print("do
+ne")'