Hi Monkies, I am making a program in windows that would open a command line and monitor (read) its output, problem is it hangs after it read thru all the buffer. I have a similar code that works fine in linux, but hangs in windows.

#!/usr/bin/perl -w

use strict;
use Gtk2 '-init';
use Gtk2::Helper;
use Data::Dumper;
use IPC::Open2;
use FileHandle;

# file handles
my $wfh = FileHandle->new();
my $rfh = FileHandle->new();
open2($rfh,$wfh, "C:\\Windows\\System32\\cmd.exe");
my $tag = Gtk2::Helper->add_watch($rfh->fileno(), 'in',\&preview_call)
+;


my $window = Gtk2::Window->new();
$window->signal_connect("destroy",sub{Gtk2->main_quit();});
$window->set_size_request(200,200);
    my $vbox = Gtk2::VBox->new();
    $window->add($vbox);
        my $button = Gtk2::Button->new("TEST");
        $button->signal_connect('clicked'=>sub{
                mysub();
            });
        $vbox->pack_start($button,0,0,0);
        
$window->show_all();
Gtk2->main();

sub preview_call {
    my $buffer;
    my $rl = sysread($rfh,$buffer,1);
    if(defined($rl)){
        print "$rl + $buffer\n";
        while (Gtk2->events_pending()) {Gtk2->main_iteration();}
        return 1;
    }else{
        print "undefined\n";
        return 0;
    }
}

sub mysub {
    print $wfh "echo wako\n";
}
[download]

I think the problem is in the Gtk2::Helper->add_watch. Help! This shouldnt freeze the window, i should be able to press the button and the monitor should be able to see the echo command under the mysub subroutine