From owner-freebsd-questions@FreeBSD.ORG  Sat Feb 18 00:54:27 2006
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
X-Original-To: freebsd-questions@freebsd.org
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 9A83E16A420
	for <freebsd-questions@freebsd.org>;
	Sat, 18 Feb 2006 00:54:27 +0000 (GMT)
	(envelope-from pranavpeshwe@gmail.com)
Received: from wproxy.gmail.com (wproxy.gmail.com [64.233.184.206])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 1C39743D45
	for <freebsd-questions@freebsd.org>;
	Sat, 18 Feb 2006 00:54:26 +0000 (GMT)
	(envelope-from pranavpeshwe@gmail.com)
Received: by wproxy.gmail.com with SMTP id i27so527522wra
	for <freebsd-questions@freebsd.org>;
	Fri, 17 Feb 2006 16:54:26 -0800 (PST)
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com;
	h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references;
	b=rZ/xpKKGXOQO5b1+fHDQBmFn+vf0aD0BlBxsgnz6xEWPxwijol0vCDX+aYTu9LOw4kqnOWzVER9OsTKutLFv7n6N0HGCI6gEI6BYodzzALaOTbg1884Lxd7FD7uIkUr4U3mEm08F/o5GoYs3x+bQa9dSrEN+ucRop7DpYjS3j84=
Received: by 10.54.66.14 with SMTP id o14mr1783363wra;
	Fri, 17 Feb 2006 16:54:26 -0800 (PST)
Received: by 10.54.101.5 with HTTP; Fri, 17 Feb 2006 16:54:26 -0800 (PST)
Message-ID: <cdfd7d6d0602171654r627d8fa8w2d3adcf2fd6b1177@mail.gmail.com>
Date: Sat, 18 Feb 2006 06:24:26 +0530
From: "Pranav Peshwe" <pranavpeshwe@gmail.com>
To: "divyesh shah" <divs_83@yahoo.com>
In-Reply-To: <20060217224153.15856.qmail@web31010.mail.mud.yahoo.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline
References: <20060217224153.15856.qmail@web31010.mail.mud.yahoo.com>
Cc: freebsd-questions@freebsd.org
Subject: Re: debugging kernel code..
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 18 Feb 2006 00:54:27 -0000

On 2/18/06, divyesh shah <divs_83@yahoo.com> wrote:
> I have added a system call and a somple program which
> uses that call. However, I need to debug my system
> call code. gdb doesn't help as it doesnt allow me to
> step into kernel level code from my user test program.
> Is there any way I can write debug information(say
> like printf statements)? I have seen some kernel code
> using printf's but I wonder where would they be
> printed out. Is there some kind of kernel log file??
>
Hello,
          You can use printfs in your module.You will be able to see
whatever you have printfed on the console,also it is logged in the
ASCII text file - /var/log/messages. You can use uprintf if you do not
want to log the messages in the file but want to see them on
console.You can configure DDB and remote GDB (using a serial line) for
debugging kernel code/modules.

HTH.

Regards,
Pranav

---------------------------------------------------------------------------
"There is no such thing as a foe. There is no such thing in existence as
a friend.
It is force of circumstances that creates friends and foes."
=09=09=09- The Mahabharata