bug#51377: Automatically exit server when it has no remaining clients

[Gregory Heytings]

> Yeah, that looks like it should avoid any data loss. However, it's not 
> the behavior I'd personally expect. As I understand it, this will just 
> keep the Emacs daemon alive if there are any unsaved files.

Indeed.  And if there are any running processes.  This is I think the 
least surprising behavior for users who use the Emacs daemon.

> I'd find it easier to use if Emacs warned the user about unsaved files 
> before killing the last client. Then, Emacs can safely kill the daemon 
> once I've confirmed that that's what I want.

I'm not sure I understand why this would be better.

If want you want is to save unsaved buffers and stop the daemon when you 
close the last frame, you can simply use:

(defun save-buffers-kill-terminal (&optional arg)
  (interactive "P")
  (if (and (frame-parameter nil 'client)
           (cddr (frame-list)))
      (server-save-buffers-kill-terminal arg)
    (save-buffers-kill-emacs arg)))