$ perl test.pl 2 perl -e'system("sleep 4; echo My work is done")'
timed out
sent kill to 0
My work is done
$?=0

$ perl test.pl 2 perl -MPOSIX -e'setpgrp(0,0); system("sleep 4; echo My work is done")'
timed out
sent kill to 1
$?=15