When I change my function as below and send "sleep 50" as a command, can_write is returning input file handle as one of the value. so it means it can be written ?. I expected it should not return input file handle since we cannot write into 'sleep' command.

Any Explanation or fix??

sub canSendInput
{
    my $self = shift;
    my $pid = waitpid($self->{pid}, WNOHANG)
    my @ready = $self->{'selector'}->can_write(1);#
    Dumper(\@ready);
}
[download]