#!/usr/bin/perl   
my $pid = fork;
die "Can't fork: $!" if ! defined $pid;
if ( $pid ) {
    # parent
 print "Parent process: PID=$$,child=$pid\n";
my $i=0;
print "Press Ctrl-C to terminate child\n";
print "Parent:            Child:\n";
while($i<100)
 {
   $i++;
   print "$i\n";
   sleep 1;
 $SIG{INT} = sub {
        warn "Sending sig INT to child PID $pid";
        kill 'INT' => $pid;
        };
 }
}
else {
    # child
my $j=100;
sleep 1;
while($j>0){
     $j--;
     print "                    $j\n";
     sleep 1;
};
    $SIG{INT} = sub { die "Caught sig INT" };
    sleep 1 while 1;
    exit;
},