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From: Richard M Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Functions in kill-emacs-hook aren't run if emacs gets killed
	with	SIGTERM
Date: Thu, 22 Jan 2009 20:52:42 -0500
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Cc: eliz@gnu.org, emacs-devel@gnu.org, tassilo@member.fsf.org,
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To: Andreas Schwab <schwab@suse.de>
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In-reply-to: <jeab9jfyan.fsf@sykes.suse.de> (message from Andreas Schwab on
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Xref: news.gmane.org gmane.emacs.devel:108121
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/108121>

The main difference between SIGUSRx and SIGTERM is that SIGTERM is the
normal way to stop a process, while SIGUSRx are meant for
communication to it.

So it seems to me that Emacs should pass SIGUSRx to Lisp code and
otherwise ignore it.  I believe that's what it did in the past.  At
some point it pushed an event which could run a command later.