bug#14297: 24.3.50; emacs subprocesses don't exit on "exit"

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 12 May 2013 21:38:55 -0700
> From: Paul Eggert <eggert@cs.ucla.edu>
> Cc: 14297@debbugs.gnu.org
> 
> > It's pretty non intuitive, how failure of
> > (process-live-p proc) is connected to window toolkit?
> 
> The problem is that Gtk creates subprocesses in its own thread,
> and the Emacs main thread (until recently) mistakenly reaped these
> subprocesses with waitpid (-1, ...).  See:
> 
> https://bugzilla.gnome.org/show_bug.cgi?id=687075#c2
> http://bugs.gnu.org/8855
> http://bugs.gnu.org/9627
> http://bugs.gnu.org/12980
> 
> Fixing this Emacs bug required changing how Emacs waited for children;
> it no longer does a waitpid (-1, ...), but always does a waitpid
> for children that it knows about.
> 
> Given the discussion in
> <https://bugs.launchpad.net/ubuntu/+source/emacs23/+bug/1142213>
> it appears that the bug is in something other than Emacs proper,
> and affects other programs.

My reading of that discussion is that the problems were observed in
Emacs 23, but not in "emacs-snapshot" (which probably means the trunk,
since that was written 2 weeks ago).  By contrast, Vitalie here says
the opposite: that the problem exists on the trunk, but not on the
emacs-24 branch.

So I'm not sure this is the same problem.