From owner-freebsd-hackers@FreeBSD.ORG  Tue Aug 16 23:57:48 2005
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
X-Original-To: freebsd-hackers@freebsd.org
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id F1ABB16A41F
	for <freebsd-hackers@freebsd.org>; Tue, 16 Aug 2005 23:57:47 +0000 (GMT)
	(envelope-from michael.honeyfield@gmail.com)
Received: from xproxy.gmail.com (xproxy.gmail.com [66.249.82.197])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 930E143D46
	for <freebsd-hackers@freebsd.org>; Tue, 16 Aug 2005 23:57:47 +0000 (GMT)
	(envelope-from michael.honeyfield@gmail.com)
Received: by xproxy.gmail.com with SMTP id i27so7158wxd
	for <freebsd-hackers@freebsd.org>; Tue, 16 Aug 2005 16:57:46 -0700 (PDT)
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com;
	h=received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition;
	b=omCAEmbfy4oYP1P+An8ExogxXHiS4+5OWmn7/UpKU0Ms72m4z6+AWRM7MrEZrq8QZzkpnZi7CvYoaIJ1yXFOEy6LfoDkRL5vT5KMFiXFYSorWbbqzfYsGmO/UOZ/hFInzPt2qLIvR1burzXZ3Eed+atZ//RVuc7wNiMetHpWe0w=
Received: by 10.70.15.19 with SMTP id 19mr366wxo;
	Tue, 16 Aug 2005 16:57:46 -0700 (PDT)
Received: by 10.70.20.4 with HTTP; Tue, 16 Aug 2005 16:57:46 -0700 (PDT)
Message-ID: <16d2d73705081616576dea9072@mail.gmail.com>
Date: Wed, 17 Aug 2005 11:57:46 +1200
From: Michael Honeyfield <michael.honeyfield@gmail.com>
To: freebsd-hackers@freebsd.org
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline
Subject: driver mmap weirdness
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 16 Aug 2005 23:57:48 -0000

Hello,

I am looking for some advise on troubleshooting a issue I am seeing
with mmap() (probably how I am using it).

I have a issue where a driver returns a correct value, but it seem to
get lost when that value is validated by mmap() and returns
MAP_FAILED.

Obviously gdb is not going to be able to set into the kernel and set
through each call, so am I left with using ddb ?

Any points/suggestions on dealing with this would be greatly appreicated.=
=20

Thanks in advance..

Mike