Hello, I have a big problem that I can't solve. I need to write something kinda telnet server in perl (not exactly telnet, but it should support 2-way communication with a child it started). I can't succeed redirecting input/output of a child to the internet socket - the child reports Bad file descriptor on every write to stdout). I've wrote a sample child in Perl to diagnose a problem (save to testfile-slave.pl): 
#!/usr/bin/perl

use strict;

select(STDIN);$| = 1;
select(STDOUT);$| = 1;
print STDERR "starting interaction\n";
$! = '';

print "GET /\n\n";
print STDERR "printerr is $! " . fileno(STDIN) . ", " . fileno(STDOUT)
+ . "\n";
print STDERR "req sent\n";
$! = '';
while (<STDIN>)
{
        my $v = $_;
print STDERR "readerr is $!\n";
    print STDERR $v;
}
print STDERR "readerr is $!\n";
print STDERR "done interaction\n";
-----------

I tried several versions of servers, and all behave the same:
#------version1 - works fine on linux
#!/usr/bin/perl
use strict;

use IO::Socket;
my $conn = IO::Socket::INET->new(
                        Proto    => "tcp",
                        PeerAddr => "192.168.0.12", #change to any hos
+tname
                        PeerPort => 80,
    ) || die("can't connect");

open(STDIN,"<&" . $conn->fileno);
open(STDOUT,">&" . $conn->fileno);
system("$^X testfile-slave.pl");
print STDERR "done\n";
--------------------

#---------version2 - windows-specific
#!/usr/bin/perl
#use strict;

use IO::Socket;
my $conn = IO::Socket::INET->new(
    Proto    => "tcp",
    PeerAddr => "192.168.0.12", #use address of any web server here
    PeerPort => 80) || die("can't connect");

binmode($conn);
open(STDIN,"<&" . $conn->fileno) || print STDERR "can't redir stdin\n"
+;
open(STDOUT,">&" . $conn->fileno) || print STDERR "can't redir stdout\
+n";
my $file = "testfile-slave.pl";
use Win32::Process;     use Win32;
my ($ProcessObj,$exitcode);
if (Win32::Process::Create($ProcessObj, "$^X","$^X $file",
                    1, NORMAL_PRIORITY_CLASS,".")) {
                    $ProcessObj->Wait(500000);
                    $ProcessObj->Kill($exitcode);
} else {   print STDERR "failed executing $file\n"; };
print STDERR "done\n";
--------------------

[download]
It appears to be some problems with Windows (e.g. possibly total inability to redirect IO from sockets) - does anybody knows about this? May be using IPC::open3 and IO::Select will help? Tested on Win98SE with ActiveState perl 5.8.0. Thanks in advance. (PS: I've searched entire google, and didn't find anything useful).

BazB changed pre tags to code tags.

In reply to Redirecting input and output of child process to inet socket fails on Win32 by Anonymous Monk

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