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Subject: [bug#30464] shepherd logging
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From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
References: <20180215114256.551-1-dannym@scratchpost.org>
	<20180215114742.663-1-dannym@scratchpost.org> <87r2pm8gfl.fsf@gnu.org>
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Date: Sat, 17 Feb 2018 17:25:07 +0100
In-Reply-To: <20180216220737.0b5b7c0d@scratchpost.org> (Danny Milosavljevic's
	message of "Fri, 16 Feb 2018 22:07:37 +0100")
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To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: 30464@debbugs.gnu.org

Danny Milosavljevic <dannym@scratchpost.org> skribis:

> Oops, didn't see /var/log/shepherd.log - but I think it should just
> use syslog for that - and it's possible to use syslog for that by
> writing to /dev/kmsg .
>
> Does the Hurd with /dev/kmsg ?

It doesn=E2=80=99t have /dev/kmsg, but it has /dev/klog:

--8<---------------cut here---------------start------------->8---
ludo@darnassus:~$ ls -l /dev/klog=20
crw-rw---- 1 root root 0, 0 Jul 16  2015 /dev/klog
ludo@darnassus:~$ showtrans /dev/klog=20
/hurd/streamio kmsg
--8<---------------cut here---------------end--------------->8---

> How do they solve early boot logging ?

GNU=C2=A0Mach has a special =E2=80=9Cconsole=E2=80=9D device that early boo=
t processes can
open and write too, as in:

  https://git.savannah.gnu.org/cgit/hurd/hurd.git/tree/startup/startup.c#n7=
31

It=E2=80=99s comparable to /dev/kmsg, but it exists before file system serv=
ers
are brought up, which is why it doesn=E2=80=99t have an entry in the file
system hierarchy.

Ludo=E2=80=99.