From owner-freebsd-hackers@FreeBSD.ORG  Fri Oct 31 13:30:04 2003
Return-Path: <owner-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 206AA16A4CF
	for <freebsd-hackers@freebsd.org>;
	Fri, 31 Oct 2003 13:30:04 -0800 (PST)
Received: from harmony.village.org (rover.bsdimp.com [204.144.255.66])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 1425743F93
	for <freebsd-hackers@freebsd.org>;
	Fri, 31 Oct 2003 13:30:03 -0800 (PST)	(envelope-from imp@bsdimp.com)
Received: from localhost (warner@rover2.village.org [10.0.0.1])
	by harmony.village.org (8.12.9p2/8.12.9) with ESMTP id h9VLU1E7062416;
	Fri, 31 Oct 2003 14:30:01 -0700 (MST)
	(envelope-from imp@bsdimp.com)
Date: Fri, 31 Oct 2003 14:29:59 -0700 (MST)
Message-Id: <20031031.142959.33240958.imp@bsdimp.com>
To: andi_payn@speedymail.org
From: "M. Warner Losh" <imp@bsdimp.com>
In-Reply-To: <1067635232.825.202.camel@verdammt.falcotronic.net>
References: <1067628015.825.64.camel@verdammt.falcotronic.net>
	<20031031.130229.132929054.imp@bsdimp.com>
	<1067635232.825.202.camel@verdammt.falcotronic.net>
X-Mailer: Mew version 2.2 on Emacs 21.3 / Mule 5.0 (SAKAKI)
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
cc: dwmalone@maths.tcd.ie
cc: freebsd-hackers@freebsd.org
Subject: Re: O_NOACCESS?
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
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: Fri, 31 Oct 2003 21:30:04 -0000

In message: <1067635232.825.202.camel@verdammt.falcotronic.net>
            andi payn <andi_payn@speedymail.org> writes:
: > : Are there any other special devices like this in FreeBSD?
: > 
: > Rewind units on tape drives?  If there's no access check done, and I
: > open the rewind unit as joe-smoe?  The close code is what does the
: > rewind, and you don't have enough knowledge to know if the tape was
: > opened r/w there.

Actually, it looks like there's a flags parameter passed to close,
which I think could be used to 'know'.  No one uses it now.

: Thanks; that's a good example. Do you have an example of a specific
: driver so I can look at the code and see what would need to be done?

src/sys/cam/scsi/scsi_sa.c.

Warner