X-Recipient:	archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status:	No, hits=-2.0 required=5.0 tests=AWL,BAYES_00,SPF_SOFTFAIL
X-Spam-Check-By:	sourceware.org
Message-ID:	<4AFDCB3F.6010904@byu.net>
Date:	Fri, 13 Nov 2009 14:10:23 -0700
From:	Eric Blake <ebb9 AT byu DOT net>
User-Agent:	Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.23) Gecko/20090812 Thunderbird/2.0.0.23 Mnenhy/0.7.6.666
MIME-Version:	1.0
To:	Salvador Fandino <sfandino AT yahoo DOT com>
CC:	cygwin AT cygwin DOT com
Subject:	Re: [BUG] fopen(..., "a") does not seek to end of file until some write operation
References:	<592384 DOT 26227 DOT qm AT web52612 DOT mail DOT re2 DOT yahoo DOT com> <4AFDC46A DOT 3070503 AT byu DOT net> <158595 DOT 94935 DOT qm AT web52607 DOT mail DOT re2 DOT yahoo DOT com>
In-Reply-To:	<158595.94935.qm@web52607.mail.re2.yahoo.com>
X-IsSubscribed:	yes
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
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

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

According to Salvador Fandino on 11/13/2009 1:55 PM:
>> Not a bug.  POSIX allows this behavior, and Linux does it as well.
> 
> In Linux (at least on the one I have installed, Ubuntu 9.10) ftell does not return cero but the EOF offset:

Ok, so "a" and "a+" apparently behave differently in Linux.  Submit a
patch to newlib if it bothers you.  Still, the point remains that this
does not violate POSIX.  Also, since the underlying open() is _required_
to be at offset 0 when opening a file for appending, it is actually _more_
syscalls if stdio seeks to the end of an append stream during fopen(),
rather than waiting until the first write.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9 AT byu DOT net
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (Cygwin)
Comment: Public key at home.comcast.net/~ericblake/eblake.gpg
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iEYEARECAAYFAkr9yz8ACgkQ84KuGfSFAYB5xQCfSJfFcEpkpFdiCQJ1WU1xFWHb
UigAn05HDxKfozs7eFkMgxZ8PiBgJoHS
=sfVV
-----END PGP SIGNATURE-----

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

- Raw text -