linux-kernel - Re: [BUG] Generic syscalls -- chmod vs. fchmodat

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Date:	Thu, 10 Feb 2011 19:12:21 +0100
From:	Andries Brouwer <aebr@....tue.nl>
To:	Roland McGrath <roland@...hat.com>
Cc:	Arnd Bergmann <arnd@...db.de>, linasvepstas@...il.com,
	Chris Metcalf <cmetcalf@...era.com>,
	GLIBC Devel <libc-alpha@...rceware.org>,
	linux-kernel@...r.kernel.org, libc-ports@...rceware.org,
	linux-api@...r.kernel.org, Mike Frysinger <vapier@...too.org>
Subject: Re: [BUG] Generic syscalls -- chmod vs. fchmodat

On Tue, Jan 25, 2011 at 09:45:15AM -0800, Roland McGrath wrote:

> the empty string has never been a valid relative pathname.

Hmm. I definitely recall otherwise.

The old Unix definition is that the empty string stands for "."
so that 'ls ""' means the same as 'ls .'
and 'ls /tmp/""' the same as 'ls /tmp/.'.

Let me try.

On a recent Linux system:

% ls -l ""
ls: cannot access : No such file or directory

On an old Unix system:

# ls -l ""
drwxr-xr-x  2 bin      1040 Jan  1  1970 bin
drwxr-xr-x  2 bin       352 Jan  1  1970 dev
drwxr-xr-x  2 bin       304 Aug 20 12:39 etc
...

Andries
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