use POSIX;
$SIG{CHLD} = 'IGNORE';
my $snoop = fork();
if ( $snoop == 0 ){
    setpgrp;
    system("tcpdump -ni int0 -c 5 -w /tmp/somefile &");
}

my $sleeper = 0;
while ( $sleeper < 11 ){
    # How do I check the status of my child pid? I don't want to wait for it to finish, just know if it is still running and 'last;' if not.
    sleep 1;
    $sleeper++
}

# Only kill the child pid, if it is running. need help here.
kill -1, getpgrp($snoop);
# continue on with my code