From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andy Wingo <wingo@igalia.com>
Subject: Re: elogind status
Date: Thu, 27 Aug 2015 15:58:29 +0200
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To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
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On Thu 27 Aug 2015 15:25, ludo@gnu.org (Ludovic Court=C3=A8s) writes:

> Andy Wingo <wingo@igalia.com> skribis:
>
>> I will keep this patch stack up to date at wip-pam-elogind.  On that
>> branch there's an update to a new elogind that includes systemd's code
>> to suspend/hibernate/hybrid-sleep the system, as well as new code to
>> implement the poweroff/halt/reboot things.
>
> How does poweroff/halt/reboot works?
>
> On GuixSD, =E2=80=98halt=E2=80=99 & co. make an RPC to dmd so that it ter=
minates all the
> services (including file system mounts) in the right order.
>
> Anyway, good stuff!

Currently poweroff and halt both invoke the "halt" executable, whose
full path is captured at build-time if available and otherwise searched
in the path.  In Guix the full path is captured.  Poweroff and halt are
the same on modern systems, aren't they?  Dunno.  Reboot invokes reboot,
captured in the same way, and the same for kexec.  Anyway for Guix this
should do the right thing, no?  It waits for the exec'd program to
return and checks the error code.  I guess the actual halt is async
though of course.

Suspend/hibernate/hybrid-sleep all write to /sys/power/disk and
/sys/power/state.

Andy