#!/usr/bin/perl

use warnings;
use strict;

use IO::Socket;
use IPC::Open3;

my $sock = new IO::Socket::INET (
        LocalHost => '127.0.0.1',
        LocalPort => '1818',
        Proto => 'tcp',
        Listen => 1,
        ReuseAddr => 1,
        Timeout => 20
);

die "Could not create socket: $!\n" unless $sock;

our $new_sock = $sock->accept() or die "No one came!";
my $pid = open3( "<&" . fileno($new_sock), ">&STDOUT", ">&STDERR", "/bin/cat" );
waitpid( $pid, 0 );

##</code><code>##

sh-3.2# ./test.pl 
open3: close(5) failed: Bad file number at ./test.pl line 21
sh-3.2# ps -ef | grep /bin/cat
    root  6124  6106   1 12:57:29 pts/3       0:00 grep /bin/cat
    root  6122     1   1 12:57:21 pts/3       0:00 /bin/cat
sh-3.2# Blah blah this is text coming from my telnet session