Re: Emacsclient, multiple displays and hanging

[Greg Detre <gdetre@gmail.com>]

Colin,

Thank you very much indeed. I'll try that.

g

On Oct 1, 4:30 pm, "Colin S. Miller" <no-spam-
thank-...@csmiller.demon.co.uk> wrote:
> Greg Detre wrote:
> > Dear all,
>
> > When I'm at work, I want to be able to use that same
> > emacs session on my desktop. So I sit at my desktop and ssh into my
> > laptop, using emacsclient and 'make-frame-on-display' to bring up a
> > new emacsclient session on my desktop, continuing where I left off.
>
> > The problem comes when I remove my laptop. If I forgot to close all
> > the running emacsclient windows on my desktop, then emacs on my laptop
> > hangs (since it's waiting for some kind of X input from the
> > emacsclient running on my desktop). Obviously the solution is to
> > always shut all the emacsclients on my desktop before unplugging my
> > laptop, but I forget about twice a week, and have to kill -9 my laptop
> > emacs :(
>
> Greg,
>
> the following function will kill all X-Frames on a named display
>
> (defun csm-kill-frames-on-device (display)
>    "kill all frames on display DISPLAY"
>
>    (let ((dvce))
>      (loop for frm in (frame-list)
>        do
>        (progn
>          (setq dvce (frame-device frm))
>          (if (device-on-window-system-p dvce)
>                (if (string-equal (device-connection dvce) display)
>                    (delete-frame frm)))))))
>
> or
>
> (defun csm-kill-all-non-local-x-frames ()
>    "kill all frames that are not on :0.0"
>
>    (let ((dvce))
>      (loop for frm in (frame-list)
>        do
>        (progn
>          (setq dvce (frame-device frm))
>          (if (device-on-window-system-p dvce)
>                (if (not (string-equal (device-connection dvce) '":0.0"))
>            (delete-frame frm)))))))
>
> If you close your laptop's lid before unplugging it, you can catch the
> kill -SIGPWR with an external script, have it run emacsclient, calling either the
> above functions to kill connections from your desktop.
>
> SIGPWR is sent when a UPS connected machine switches to UPS power, I'd assume it's also sent
> when a machine is hibernated/suspended (or resumed).
>
> I can't see of a way to handle signals inside emacs, so an external script is a necessary evil.
>
> HTH,
> Colin S. Miller
>
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