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Re: 1.7.3: Backspace key not working in GNU screen.
On Apr 10 22:09, Andy Koppe wrote:
> Christopher Faylor wrote:
> > I'm not 100% sure that this is the right fix but the new snapshot at
> > least works around the problem.
>
> Thanks.
>
> > The problem is that screen explicitly sets VERASE to 0. ?I believe that
> > it does that to mean "there is really no erase character since I'm
> > handling that".
>
> You're right. Zero is the value of the _POSIX_VDISABLE constant for
> disabling special characters. Therefore, using c_cc[VERASE] as the
> backspace keycode was a bad idea all along. Sorry for suggesting it in
> the first place.
>
> > That should not cause Cygwin to send a null character.
> > I think it should probably just send the default \177 character.
>
> Makes sense given the botched design, but of course it does mean that
> the user's backspace keycode setting is ignored. Also, 'screen' would
> be expecting what was set in c_cc[VERASE] as the backspace keycode.
That would be surprising. If you set VEARSE to 0 on Linux, a following
tcgetattr returns 0 as the VERASE value. stty prints "<undef>". The
same holds true for other settings like VKILL, VINTR, etc. So, if the
process sets VERASE to 0, and is then puzzled to get a 0 VERASE value
from the OS, it's the application's fault.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
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