my $fork_pid = fork();
if($fork_pid == 0){
  while(1){

    my $live_socket = $socket->accept(); # only allow parent to kill child here

    <do stuff - read from socket, checksum check, write to file, send ACK/NAK etc.>

    $live_socket->close();
  }
}
# parent should kill child nicely (9 is a bit drastic, but <9 doesn't seem to work), and only if child is waiting for a socket connection
else{
  print "Hit <ENTER> to quit\n";
  my $quit = <STDIN>;
  kill 9, $fork_pid;
}