is it possible to poll the shell for timeouts just like this example:

$chan->exec("ls -l");

my $poll = { handle => $chan, events => -1 };

        while ($ssh2->poll(500, [ $poll ])) {
                if ($poll->{revents}{out}) {
                        while (<$chan>) {
                                $r=$r.$_;
                        }
                }
                if ($poll->{revents}{channel_closed} || $poll->{revent
+s}{listener_closed}) {
                        my $exit = $chan->exit_status();
                        print $r;
                }
        }
        print "timeout\n";
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This works fine for $chan->exec(..), but i need shell to execute more than one command, can someone help me with some code to poll the shell writes and reads for timeouts???