I realise I come very late in this exchange, but just in case people are still looking for answers, I got it to work with cygwin perl on Windows XP with the following tweaks :
1/
use IO::Select;
use IO::Socket;
use IO::Handle;
use IPC::Open3;
2/
$Pin = new IO::Handle; $Pin->fdopen(10, "w");
$Pout = new IO::Handle; $Pout->fdopen(11, "r");
$Perr = new IO::Handle; $Perr->fdopen(12, "r");
$Proc = open3($Pin, $Pout, $Perr, $cmdline);
3/
$select->add($Pin);
$select->add($Pout);
$select->add($Perr);
For $cmdline I used bash, to test things by hand (with STDIN added to my select and printing on $Pin what I get on my perl process' stdin).
It works beautifully.
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