From owner-freebsd-hackers@FreeBSD.ORG  Wed Nov  4 18:34:35 2009
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id E5DFC10656A6;
	Wed,  4 Nov 2009 18:34:35 +0000 (UTC) (envelope-from ed@hoeg.nl)
Received: from palm.hoeg.nl (mx0.hoeg.nl [IPv6:2001:7b8:613:100::211])
	by mx1.freebsd.org (Postfix) with ESMTP id 823B18FC30;
	Wed,  4 Nov 2009 18:34:35 +0000 (UTC)
Received: by palm.hoeg.nl (Postfix, from userid 1000)
	id 9176B1CCCB; Wed,  4 Nov 2009 19:34:34 +0100 (CET)
Date: Wed, 4 Nov 2009 19:34:34 +0100
From: Ed Schouten <ed@80386.nl>
To: Alan Cox <alc@cs.rice.edu>
Message-ID: <20091104183434.GB1293@hoeg.nl>
References: <permail-200910211551041e86ffa80000182a-a_best01@message-id.uni-muenster.de>
	<ca3526250910211051v2fef55e7yda262a58df200751@mail.gmail.com>
	<20091103172452.GU1293@hoeg.nl>
	<200911040812.18712.jhb@freebsd.org>
	<20091104162646.GZ1293@hoeg.nl> <4AF1C707.6000706@cs.rice.edu>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;
	protocol="application/pgp-signature"; boundary="+31Goo6fsQAntfNs"
Content-Disposition: inline
In-Reply-To: <4AF1C707.6000706@cs.rice.edu>
User-Agent: Mutt/1.5.20 (2009-06-14)
Cc: alc@freebsd.org, freebsd-hackers@freebsd.org,
	Alexander Best <alexbestms@math.uni-muenster.de>
Subject: Re: mmap(2) with MAP_ANON honouring offset although it shouldn't
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: Wed, 04 Nov 2009 18:34:36 -0000


--+31Goo6fsQAntfNs
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

* Alan Cox <alc@cs.rice.edu> wrote:
> For what it's worth, I believe that Solaris does the exact opposite.
> They provide MAP_ANONYMOUS for compatibility.  It seems like a good
> idea for us to do the same.

Something like this?

Index: mman.h
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- mman.h      (revision 198919)
+++ mman.h      (working copy)
@@ -82,6 +82,9 @@
  */
 #define        MAP_FILE         0x0000 /* map from file (default) */
 #define        MAP_ANON         0x1000 /* allocated from memory, swap spac=
e */
+#ifndef _KERNEL
+#define        MAP_ANONYMOUS    MAP_ANON /* For compatibility. */
+#endif /* !_KERNEL */
=20
 /*
  * Extended flags

--=20
 Ed Schouten <ed@80386.nl>
 WWW: http://80386.nl/

--+31Goo6fsQAntfNs
Content-Type: application/pgp-signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (FreeBSD)

iEYEARECAAYFAkrxyToACgkQ52SDGA2eCwXB0QCfer7jg+fLcYA3wy0j1oTkTK5k
EeAAn0jJHNJf+/wfrm+RlKqzZ9+9vtY4
=kWRu
-----END PGP SIGNATURE-----

--+31Goo6fsQAntfNs--