Date: Tue, 4 Oct 2005 12:55:54 +0200
From: Nico Schottelius <nico-kernel@schottelius.org>
To: Coywolf Qi Hunt <coywolf@gmail.com>
Cc: Nico Schottelius <nico-kernel@schottelius.org>,
       linux-kernel@vger.kernel.org
Subject: Re: halt: init exits/panic
Message-ID: <20051004105554.GB1750@schottelius.org>
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	Coywolf Qi Hunt <coywolf@gmail.com>, linux-kernel@vger.kernel.org
References: <20050709151227.GM1322@schottelius.org> <2cd57c9005070910091f1051f7@mail.gmail.com> <20051004073740.GA1498@schottelius.org> <2cd57c900510040112q10eb5cdbya2ef62689e8f90f2@mail.gmail.com>
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Coywolf Qi Hunt [Tue, Oct 04, 2005 at 04:12:40PM +0800]:
> On 10/4/05, Nico Schottelius <nico-kernel@schottelius.org> wrote:
> > Coywolf Qi Hunt [Sun, Jul 10, 2005 at 01:09:22AM +0800]:
> > > On 7/9/05, Nico Schottelius <nico-kernel@schottelius.org> wrote:
> > > > Hello!
> > > >
> > > > What's the 'correct behaviour' of an init system, if someone wants
> > > > to shutdown the system?
> > > >
> > > > I currently do:
> > > >
> > > > - call reboot(RB_POWER_OFF/RB_AUTOBOOT/RB_HALT_SYSTEM)
> > > > - _exit(0)
> > > >
> > > > Is this exit() call wrong? If I do RB_HALT_SYSTEM and _exit(0) afte=
r,
> > > > the kernel panics.
> > >
> > > What the panic shows?
> >
> > To be fully correct:
> >
> > "Kernel panic - not syncing: Attempted to kill init" (from the last time
> > I tried, 2.6.13.2)
> >
> > Perhaps _exit(0) is not correct for an init system?
> > This at least explains why it always looks like nothing is synced.
>=20
> Right. init(8) should not call _exit() or exit(). Otherwise you'll get
> that panic. It's OK for *another* process, reboot(8) to call reboot(2)
> and then exit(). You should follow this way.

Ok, as far as I understood my init simply returns to its normal state
and hopes that the kernel halts|reboots|powers off.

Will do that' thanks for the info.

Nico

--=20
Latest project: cconfig (http://nico.schotteli.us/papers/linux/cconfig/)
Open Source nutures open minds and free, creative developers.

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