Re: PROPOSAL: Control over process cleanup in `save-buffers-kill-emacs'.

[Eli Zaretskii <eliz@gnu.org>]

> From: Karl Fogel <kfogel@red-bean.com>
> Date: Fri, 22 Sep 2017 13:58:41 -0500
> 
> I propose moving `kill-emacs-query-functions' to before the process-killing block, so that hooks can do things with processes before Emacs asks about those processes.  I haven't tested this patch yet, but this gives the idea:

We have process-query-on-exit-flag for that.

> But I can't easily do `set-process-query-on-exit-flag' at the time the IMAP processes are started, since I just run `M-x gnus' and then somewhen after that something runs IMAP (maybe there's a hook for this somewhere, but if so, I haven't found it yet).

Then perhaps we need a facility to set this flag on certain classes of
processes?

> But I could put code like this into a hook, if only there were a hook that were run before the process-killing block in `save-buffers-kill-emacs':
> 
>   (mapcar (lambda (buf)
>             (when (string-match "^ \\*imap source\\*.*" (buffer-name buf))
>               (message "shutting down IMAP process '%s'" (get-buffer-process buf)) 
>               (set-process-query-on-exit-flag (get-buffer-process buf) nil)
>               (kill-buffer buf)))
>           (buffer-list))

Why cannot you do something similar in the process sentinel, which is
called when the process begins?  Or maybe Gnus should provide a
facility to set this flag for the processes it starts?

In any case, if this is somehow impossible today, I think we should
extend the facilities that allow setting this flag, instead of
inventing a separate parallel mechanism.

Thanks.