Hello, I could use some help in getting IPC::Open3 to read from a network socket. The goal is to stream filesystem data to an external binary (zfs receive). I can read from the socket handle using angle brackets, and I can get open3 to work using a normal filehandle, but I can't combine the two and get open3 to read from the socket handle. Here is some distilled code:

#!/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;

## THIS WORKS (I can telnet to port 1818 from another terminal & see t
+he text come across):
#my $new_sock = $sock->accept() or die "No one came!";
#while ( <$new_sock> ) { print; }

## THIS WORKS (If I type "cat | ./<this_script>, I can type and see it
+ echo back):
#my $pid = open3( "<&STDIN", ">&STDOUT", ">&STDERR", "/bin/cat" );
#waitpid( $pid, 0 );

# THIS DOES NOT WORK (using open3 to read from a network handle). 
my $new_sock = $sock->accept() or die "No one came!";
#my $pid = open3( $new_sock, ">&STDOUT", ">&STDERR", "/bin/cat" ); # c
+an telnet to port but immediately disconnected
my $pid = open3( $new_sock, $new_sock, ">&STDERR", "/bin/cat" ); # can
+ telnet to port but immediately disconnected
waitpid( $pid, 0 );

close($sock);
[download]

I'm not particularly attached to using open3, I just want a way to connect my stream to to the external program. Am I missing something obvious or is this a limitation of open3? I've been avoiding IPC::Run so far as this will be copied to several computers & I'd prefer not to use a separate module. It's even fine if I can't redirect zfs receive's STDOUT or STDERR, as long as I can just connect STDIN and get the exit status. Thanks!

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