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;
}

##</code><code>##

map{$a=1-$_/10;map{$d=$a;$e=$b=$_/20-2;map{($d,$e)=(2*$d*$e+$a,$e**2
-$d**2+$b);$c=$d**2+$e**2>4?$d=8:_}1..50;print$c}0..59;print$/}0..20