On Tue, 1 Oct 2019 at 21:55, Lars Ingebrigtsen <larsi@gnus.org> wrote:

> > What is missing, therefore, is for Emacs to act as if I 19ve tried to
> quit
> > it when it is signalled by the X session manager. (This is what other
> > apps do: they immediately bring up the  1cYou have unsaved documents 1d
> > dialog, or equivalent.)
>
> How does the window manager communicate to the apps that it's closing
> down?  Is there a standard?
>

https://www.x.org/releases/X11R7.7/doc/libSM/xsmp.html

Emacs already implements this: see src/xsmfns.c. The problem is its
behaviour when there are background processes.

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