Re: Emacs daemon dies at Xorg crash

[Dan Nicolaescu <dann@ics.uci.edu>]

Ulrich Mueller <ulm@gentoo.org> writes:

  > >>>>> On Thu, 18 Dec 2008, Dan Nicolaescu wrote:
  > 
  > >> >> > Can you try the patch at:
  > >> >> > http://permalink.gmane.org/gmane.emacs.bugs/22201
  > >> >> 
  > >> >> Tested and Emacs doesn't die anymore. I find the "Connection lost ..."
  > >> >> message in the *Messages* buffer after reconnecting.
  > >> 
  > >> > IMO that patch is good, but it fixes the effect in this case, not the
  > >> > cause.
  > >> 
  > >> Hm, could you please elaborate what you mean by "effect" and "cause"
  > >> here?
  > 
  > > Emacs dies because something tries to call message while no frame is
  > > open.  This is the "effect".  The "cause" is whatever causes that
  > > message to be written, it probably should not happen.
  > 
  > But "X connection lost" is precisely what happens. What could Emacs do
  > to prevent this, if there is suddenly no X server anymore?

Kill the frames on the display that was closed and continue running?

Your backtrace seems to show that the problem happens because of
Fmake_network_process...


  > > And indeed, even for you, it happens only for some specific window
  > > managers.
  > 
  > Looks like IceWM sends a WM_DELETE_WINDOW message to the X clients
  > before it exits, while Xfce4 doesn't do this.
  > 
  > What happens if you kill -9 your X server? Does Emacs die?

I won't try kill -9 X because I've seen that lock the machine in the
past.  But C-A-backspace does not kill emacs, and I doubt it gives the WM
a chance to send any message.