From owner-cvs-src@FreeBSD.ORG  Thu Jul  8 06:08:05 2004
Return-Path: <owner-cvs-src@FreeBSD.ORG>
Delivered-To: cvs-src@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 6C66116A4CE; Thu,  8 Jul 2004 06:08:05 +0000 (GMT)
Received: from elvis.mu.org (elvis.mu.org [192.203.228.196])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 1F0D643D4C; Thu,  8 Jul 2004 06:08:05 +0000 (GMT)
	(envelope-from bright@elvis.mu.org)
Received: by elvis.mu.org (Postfix, from userid 1192)
	id 06CC75C850; Wed,  7 Jul 2004 23:08:05 -0700 (PDT)
Date: Wed, 7 Jul 2004 23:08:05 -0700
From: Alfred Perlstein <alfred@freebsd.org>
To: Bruce Evans <bde@zeta.org.au>
Message-ID: <20040708060805.GK95729@elvis.mu.org>
References: <200407072047.i67Klgqu082069@repoman.freebsd.org>
	<200407072225.i67MP03s039814@khavrinen.lcs.mit.edu>
	<20040707233455.GI95729@elvis.mu.org>
	<200407080133.i681XnxH041060@khavrinen.lcs.mit.edu>
	<20040708154704.L13116@gamplex.bde.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20040708154704.L13116@gamplex.bde.org>
User-Agent: Mutt/1.4.2.1i
cc: cvs-src@FreeBSD.org
cc: src-committers@FreeBSD.org
cc: cvs-all@FreeBSD.org
cc: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
Subject: Re: cvs commit: src/lib/libc/sys pathconf.2
X-BeenThere: cvs-src@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: CVS commit messages for the src tree <cvs-src.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src>
List-Post: <mailto:cvs-src@freebsd.org>
List-Help: <mailto:cvs-src-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 08 Jul 2004 06:08:05 -0000

* Bruce Evans <bde@zeta.org.au> [040707 23:04] wrote:
> On Wed, 7 Jul 2004, Garrett Wollman wrote:
> 
> > <<On Wed, 7 Jul 2004 16:34:55 -0700, Alfred Perlstein <alfred@freebsd.org> said:
> >
> > > if _PC_NO_TRUNC returns 1 then an application should assume that
> > > names longer than 14 characters (_POSIX_NAME_MAX) are truncated???
> >
> > No.  Under obsolete versions of POSIX, if {NO_TRUNC} is nonzero, an
> > application should assume that pathname components longer than
> > {NAME_MAX} are not truncated, but instead result in the [ENAMETOOLONG]
> > error.  Under the current version of POSIX, [ENAMETOOLONG] is
> > mandatory for all systems; this was an obsolete option to allow for
> > the behavior of the V7 filesystem, which has been phased out.
> 
> This doesn't apply to FreeBSD.  Truncation is still useful (and used) for
> old non-POSIX file systems like msdosfs:
> 
> % static int
> % msdosfs_pathconf(ap)
> % 	struct vop_pathconf_args /* {
> % 		struct vnode *a_vp;
> % 		int a_name;
> % 		int *a_retval;
> % 	} */ *ap;
> % {
> % 	struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp;
> %
> % 	switch (ap->a_name) {
> % ...
> % 	case _PC_NO_TRUNC:
> % 		*ap->a_retval = 0;
> % 		return (0);
> % ...
> % }
> 
> htpfs and ntpfs also return 0 for _PC_NO_TRUNC, possibly for less reason.
> AFAIK they don't have too-small file name lengths, but they may need to
> truncate names because that is what their native operating system does.

This is over my head, can someone please fix it? :)

-- 
- Alfred Perlstein
- Research Engineering Development Inc.
- email: bright@mu.org cell: 408-480-4684