bug#56967: 29.0.50; Frequent crashes under Wayland

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: bjorn.bidar@thaodan.de,  56967@debbugs.gnu.org
> Date: Fri, 05 Aug 2022 14:28:21 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Does _exit in glibc provide any hooks that we could use?
> 
> Not that I know of.

How about asking the glibc developers to provide one, citing this very
use case as the real-life problem to solve?  Specifically, what I'd
like to do in that hook is to shut down Emacs in an orderly manner, so
that the user won't lose all his/her edits.

> > Or maybe GTK has some knob to let it call us before it calls _exit?
> 
> Nope, GTK simply does this:
> 
>   if (wl_display_flush (display->wl_display) < 0)
>     {
>       g_message ("Error flushing display: %s", g_strerror (errno));
>       _exit (1);
>     }
> 
> if (for example) wl_display_flush, a low-level Wayland interface, fails
> from an IO error.

Amazing.  Where did those people learn to develop friendly, extensible
libraries? in what tyrannical culture?