use Socket;
use Fcntl;
use IO::Socket;
use IO::Select;

my $serv = IO::Socket::INET->new(LocalPort => 9001, Reuse => 1, Listen => 10)
   or die "Cannot open server: $!\n";

nonblock($serv);
my $sel = IO::Select->new($serv);


pipe $MYSTDERR, $MYWRITE;
*STDERR = $MYWRITE;
$sel->add($MYSTDERR);

while(1){
     for my $sock ($sel->can_read(0)) {
         if($sock == $MYSTDERR){
             my $line = <$sock>;
             print $line;
             for my $s ($sel->handles()){
                 if($s != $MYSTDERR and $s != $serv){
                     print $s $line;
                 }
             }
         } elsif($sock == $serv){
             my $new = $serv->accept();
             nonblock($new);
             $sel->add($new);
             bcast($new, "New Connection");
         } else { # this is a client reading
             my $line = <$sock>;
             if($line){
                chomp($line);
                bcast($sock, "Data: $line");
             } else {
                 bcast($sock, "Connection Dropped");
                 $sel->remove($sock);
             }
         }
     }
}

sub bcast{
    my $sock = shift;
    warn sprintf "[%s:%s] @_\n", $sock->peerhost, $sock->peerport;
}

sub nonblock {
    my $socket = shift;
    my $flags;
    $flags = fcntl($socket, F_GETFL, 0)
        or die "Can't get flags for socket: $!\n";
    fcntl($socket, F_SETFL, $flags | O_NONBLOCK)
        or die "Can't make socket nonblocking: $!\n";
}