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To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: klibc and logging
Date: 13 Aug 2002 10:41:03 -0700
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References: <3D58B14A.5080500@zytor.com> <ajaka7$qb6$1@ncc1701.cistron.net>
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Followup to:  <ajaka7$qb6$1@ncc1701.cistron.net>
By author:    "Miquel van Smoorenburg" <miquels@cistron.nl>
In newsgroup: linux.dev.kernel
>
> In article <3D58B14A.5080500@zytor.com>,
> H. Peter Anvin <hpa@zytor.com> wrote:
> >However, I'm wondering what to do about logging.  Kernel log messages 
> >get stored away until klogd gets started, but early userspace may need 
> >some way to log messages -- and syslog is obviously not running.  The 
> >easiest way to do this would probably be to be able to write to 
> >/proc/kmsg (which probably really should be /dev/kmsg) and push messages 
> >onto the kernel's message queue; but we could also have a dedicated 
> >location in the initramfs for writing logs, and do it all in userspace. 
> 
> /dev/shm/log/ ?
> 

Requires too much to work before it's can be made available.

Andrew Morton sent me a proposed patch last night which adds a klogctl
(a.k.a. sys_syslog) which does a printk() from userspace.  It was less
than 10 lines; i.e. probably worth it.  I have hooked this up to
syslog(3) in klibc, although the code is not checked in yet.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt	<amsp@zytor.com>
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