my ($out, $err) = $kssh->capture2("vsp");

##</code><code>##

my ($vsppty, vsppid)=$kssh->open2pty("vsp");
 
##</code><code>##

my $tty = $vsppty->slave;
$vsppty->make_slave_controlling_terminal();

my $ttyfd=$tty->fileno;
close $vsppty;
open STDIN, "<&$ttyfd" or die $!;
open STDOUT, ">&$ttyfd" or die $!;
open STDERR, ">&STDOUT" or die $!;
close $tty;
 
##</code><code>##

 
Error: could not connect pty as controlling terminal!