bug#16093: 24.3.50; Crash of emacs --daemon on killing X server

[Dmitry Antipov]

On 12/09/2013 07:58 PM, Nix wrote:
> Start emacs --daemon (using the lucid toolkit), under X. Shut X down.
> Emacs crashes shortly afterwards.
>
>
> The lack of symbol table info is concerning (obviously my gdb has
> forgotten how to look up separated debug info *yet again*), but I don't
> think that important, since the death site is after a (garbage-collect)
> thus not in Lisp-land anyway. Obviously no xbacktrace is possible: the
> process is dead.
>
> It is fairly clear that we should not be calling xftfont_close() if the
> X server is not there! Why has this started happening?

Hm... IIUC there is no convenient way to check whether X display connection
is alive. But we can do some tricks, for example, try to select() or poll()
ConnectionNumber() - if there is no EBADF, X server is hopefully present...

Dmitry

bug16093.patch
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