my $err = ioctl STDOUT, &TIOCGWINSZ, $winsize;

##</code><code>##

my $err = ioctl(TTY, &TIOCGWINSZ, $winsize = "");

##</code><code>##

sub TIOCGWINSZ {
    0x40087468
}

##</code><code>##

#!/usr/bin/perl 

use strict;
use Term::ReadKey;
use Data::Dumper::Concise;

sub getwinsize (;$) {
    my $recheck = $_[0];
    my $winsize = 0;
    my ( $maxrow, $maxcol );

    return ( $maxrow, $maxcol ) if $maxrow && $maxcol && !$recheck;

    my $err = ioctl(TTY, &TIOCGWINSZ, $winsize = "");

    if ($err) {
        print STDERR "ERROR: ioctl on STDOUT: $!\n";
        unless ( ioctl( TTY, &TIOCGWINSZ, $winsize = "" ) ) {
            print STDERR "ERROR: ioctl on fileno(STDOUT): $!\n";
        }
        else {
            printf STDERR "ioctl on fileno(STDOUT) worked\n";
        }
    }
    else {
        printf STDERR "ioctl on STDOUT worked\n";
    }
    return;
}
print Dumper(GetTerminalSize());
print getwinsize();

sub TIOCGWINSZ {
    0x40087468
}