bug#56528: 29.0.50; Emacs lucid segfaults when X dies

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: Visuwesh <visuweshm@gmail.com>,  56528@debbugs.gnu.org
> Date: Thu, 14 Jul 2022 08:39:23 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Btw, what do we expect Emacs to do in this scenario?  If the X server
> > is killed, Emacs cannot display anything, so why an abort is not TRT?
> > What practically interesting use case does this emulate?
> 
> It should just print an error message and die with a specific exit code,
> without printing a giant backtrace to stdout.

Print an error message where?

> Would binding `inhibit-redisplay' around the call to Fkill_emacs be a
> reasonable solution?

No, because that's not what inhibit-redisplay is for.

I think the right solution for this use case is to add a new command
that deletes all client frames.  We are talking about a user who
intentionally kills the X server, so the ability to conveniently
delete all the frames except the daemon frame will (or should) allow
Emacs to survive the traumatic event.