Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
Message-ID: <430F0DDA.9040609@byu.net>
Date: Fri, 26 Aug 2005 06:40:58 -0600
From: Eric Blake <ebb9 AT byu DOT net>
User-Agent: Mozilla Thunderbird 1.0.2 (Windows/20050317)
MIME-Version: 1.0
To: cygwin AT cygwin DOT com
Subject: Re: Problem with sh/bash and snapshot cygwin1-20050825.dll
References: <430E9B0B DOT 8040303 AT scytek DOT de> <20050826052618 DOT GC4087 AT trixie DOT casa DOT cgf DOT cx> <20050826090717 DOT GB21203 AT calimero DOT vinschen DOT de> <430F0849 DOT 8040002 AT byu DOT net>
In-Reply-To: <430F0849.8040002@byu.net>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
X-IsSubscribed: yes

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

According to Eric Blake on 8/26/2005 6:17 AM:
> I also noticed that realpath("c:..", buf) now returns "c:", rather than
> "/cygdrive" - I guess it comes down to the choice of whether cygwin has 2
> roots or 28 roots.  I prefer 2 roots (so that the parent directory of any
> drive letter is the cygdrive prefix), but maybe I can be convinced that 28
> is okay.  But whatever the choice is, it should be consistent - right now
> realpath("c:/..", buf) is failing with ENOENT, even though it should have
> the same result as realpath("c:..", buf).

Replying to myself, if cygwin is ever changed so that it tracks 27 current
working directories the way Windows does (using the !C: environment
variable and friends), then c:.. and c:/.. would have to have different
semantics.  But currently cygwin is documented as implicitly inserting a
path separator after a drive letter, so that all pathnames from a drive
letter start at the root of the drive.

Also, another argument for cygwin to only have 2 roots instead of 28 is
that realpath() is then consistent with getcwd(), and that way, ALL
fully-resolved absolute paths start with '/'.  In other words, since
chdir("c:");getcwd(buf, PATH_MAX) returns /cygdrive/c, so should
realpath("c:", buf).

As to your comment in path.cc about realpath(path, NULL) malloc'ing its
result being weird, it is consistent with getcwd(NULL, 0) malloc'ing its
result, and it is quite useful.

- --
Life is short - so eat dessert first!

Eric Blake             ebb9 AT byu DOT net
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (Cygwin)
Comment: Public key at home.comcast.net/~ericblake/eblake.gpg
Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org

iD8DBQFDDw3a84KuGfSFAYARAm43AKCyrAyRRgdD5ziTXFHuBBdQmHDipwCdF8q/
rxekL6Aw70gvyijX3qZXJt8=
=bD2n
-----END PGP SIGNATURE-----

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/