From owner-freebsd-current@FreeBSD.ORG  Tue Sep 29 13:05:08 2009
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id C9B39106566B;
	Tue, 29 Sep 2009 13:05:08 +0000 (UTC) (envelope-from des@des.no)
Received: from tim.des.no (tim.des.no [194.63.250.121])
	by mx1.freebsd.org (Postfix) with ESMTP id 89A6A8FC2D;
	Tue, 29 Sep 2009 13:05:08 +0000 (UTC)
Received: from ds4.des.no (des.no [84.49.246.2])
	by smtp.des.no (Postfix) with ESMTP id 8FE006D41C;
	Tue, 29 Sep 2009 13:05:07 +0000 (UTC)
Received: by ds4.des.no (Postfix, from userid 1001)
	id 729D584529; Tue, 29 Sep 2009 15:05:07 +0200 (CEST)
From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: Ivan Voras <ivoras@freebsd.org>
References: <4AC141B0.4090705@delphij.net>
	<alpine.BSF.2.00.0909291245080.91454@fledge.watson.org>
	<h9st65$eni$1@ger.gmane.org> <86ws3iexl3.fsf@ds4.des.no>
	<h9t09n$qhl$1@ger.gmane.org>
Date: Tue, 29 Sep 2009 15:05:07 +0200
In-Reply-To: <h9t09n$qhl$1@ger.gmane.org> (Ivan Voras's message of "Tue, 29
	Sep 2009 14:58:37 +0200")
Message-ID: <86ske5gav0.fsf@ds4.des.no>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.95 (berkeley-unix)
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Cc: freebsd-current@freebsd.org
Subject: Re: [PATCH] Shutdown cooloff feature
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 29 Sep 2009 13:05:08 -0000

Ivan Voras <ivoras@freebsd.org> writes:
> Dag-Erling Sm=C3=B8rgrav <des@des.no> writes:
> > [...] shutdown(8) sends either SIGINT, SIGUSR or SIGUSR2 to init(8),
> > which runs /etc/rc.shutdown before killing all remaining processes
> > and either reboot / halt or start a single-user shell, while
> > reboot(8) and halt(8) send SIGTSTP to init(8), then SIGTERM to every
> > other process in the system, then SIGKILL to any process that hasn't
> > responded to SIGTERM after somewhere between five and sixty seconds,
> > before issuing a reboot(2) syscall.
> Is this distinction between them useful (other than possibly speed of
> shutdown/reboot)?

Good question.  You definitely want to run rc.shutdown in the common
case (multi-user mode), but running it in single-user mode may have
unintended consequences.

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no