stepik-last-20200729-001

use strict;
use IO::Socket;
setpgrp(0,0);
my $general_ppid = $$;  # print $general_ppid."\n";
my $server = IO::Socket::INET->new(
    LocalPort => 8080,
    Type      => SOCK_STREAM,
    ReuseAddr => 1,
    Listen    => 10)
or die "Can't create server on port 8080 : $@ $/";
while (my $client = $server->accept()) {
my $child = fork();
if ($child) { close($client); next }
if (defined $child) {
close( $server );
$client->autoflush(1);
my $message;
do {
  if (defined (my $message1 = <$client>))
  { chomp $message1; $message = $message1; }
  else { last ; }
  if ($message eq "exit") { kill -2, 0 }
  else { print $message."\n"; }
} while (1);
close( $client );
exit;
} else { die "Can't fork^ $!"; }
}