I don't think it is - it seems like my script is actually dying at the open3 step, while the child lives on (at least under 5.8.4). I'm dropped back to a shell prompt , even though my telnet session is still open in the other window and cat is still printing the text to my terminal. I removed the redundant close to no effect, it doesn't seem that the script had been getting that far. 
#!/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", "/b
+in/cat" );
waitpid( $pid, 0 );

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Here is the result: 
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

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In reply to Re^4: IPC::Open3 not connecting network socket handle by Anonymous Monk
in thread IPC::Open3 not connecting network socket handle by Anonymous Monk

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