$SIG{CHLD} = $SIG{TERM} = $SIG{INT} = $SIG{__WARN__} = 'DEFAULT';
exec $prog, $call, 'connect';
} else {
sleep(1); # do a coordination
$SIG{CHLD} = $SIG{TERM} = $SIG{INT} = $SIG{__WARN__} = 'DEFAULT';
exec $prog, $call, 'connect';
} else {
sleep(1); # do a coordination