linux-kernel - Re: [PATCH] open(2): document O

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Message-ID: <20120503132025.GO6871@ZenIV.linux.org.uk>
Date:	Thu, 3 May 2012 14:20:25 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Ted Ts'o <tytso@....edu>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Mike Frysinger <vapier@...too.org>, linux-man@...r.kernel.org,
	Richard Weinberger <richard@....at>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] open(2): document O_PATH

On Thu, May 03, 2012 at 09:07:07AM -0400, Ted Ts'o wrote:
> On Thu, May 03, 2012 at 01:57:21PM +0530, Aneesh Kumar K.V wrote:
> > 
> > fstat won't work, but fstatat with an empty path name would work. O_PATH
> > descriptors are suppose to be used as "location only descriptors". 
> > We then extended the *at syscalls to work with EMPTY pathnames so that
> > O_PATH descriptors can be used with readlink, fchownat and fstatat().
> > This was done to enable us to do these operation on symlinks.
> > (65cfc6722361570bfe255698d9cd4dccaf47570d)
> 
> Could you define explicitly what you mean by "EMPTY" pathnames?

"".  Normally yields -EINVAL when used as a relative pathname in ...at()
syscalls.
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