I am working on a peer-peer chat system (which later should involve some interesting encryption). However, now I'm only doing the basics. I've set up one side to be a server and am using the Telnet in Windows to connect to the script on my unix box. My server is the following:

#!/usr/bin/perl

use IO::Socket;
$SIG{CHLD} = sub {wait()};

$main_sock = new IO::Socket::INET(    LocalHost => 'b5',
                                    LocalPort => 6666,
                                    Listen    => 5,
                                    Proto     => 'tcp',
                                    Reuse     => 1) or die $!;

$line = "";
while ($new_sock = $main_sock->accept()) {
    $pid = fork();
    die "Cannot fork: $!" unless defined($pid);
    if ($pid == 0) {
        # Child process
        while (defined ($buf = <$new_sock>)) {
            print "Client said: $buf\n";
        }
        exit(0);
    } else {
        $line = <STDIN>;
        print $new_sock "$line";
    }
}

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My question is with regards to non-blocking. When I first connect, I can write from my telnet session to my server no problem but I can only send one thing I type from my server. Somehow it is not getting to the print $new_sock "$line"; statement. I'm doing forking because it seemed less hairier than using IO::Select. This code has been borrowed and modified from Advanced Perl Programming.

In reply to Sockets by radagast

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