Re: read a reply from the terminal

[Eli Zaretskii <eliz@gnu.org>]

> From: Dan Nicolaescu <dann@ics.uci.edu>
> Date: Sun, 15 Jul 2007 08:30:00 -0700
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, emacs-devel@gnu.org
> 
> Andreas Schwab <schwab@suse.de> writes:
> 
>   > Dan Nicolaescu <dann@ics.uci.edu> writes:
>   > 
>   > > !       ;; Try to find out the type of terminal by sending a "Secondary
>   > > !       ;; Device Attributes (DA)" query.
>   > > !       (send-string-to-terminal "\e[>0c")
>   > > ! 
>   > > !       ;; The reply should be of the form: \e [ > NUMBER1 ; NUMBER2 ; NUMBER3 c
>   > > !       (when (equal (read-event) ?\e)
>   > 
>   > > ! 	(when (equal (read-event) 91)
>   > > ! 	  (while (not (equal (setq chr (read-event)) ?c))
>   > > ! 	    (setq str (concat str (string chr))))
>   > 
>   > What if the terminal is ignoring the query, or there is some other
>   > communication problem, wouldn't that mean that read-event would hang
>   > here?  IMHO the calls should use the timeout feature.
> 
> Good point.

I thought about the same problem as Andreas, but didn't ask the
question since you told that you've tested the code on many terminals,
and I assumed those terminals included at least one that didn't
support this command.  If that's not so, I suggest to test the new
code (with timeout) on such a terminal, as well as on those which do
support the command.