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: <4AFDC46A.3070503@byu.net> Date: Fri, 13 Nov 2009 13:41:14 -0700 From: Eric Blake 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: cygwin AT cygwin DOT com, sfandino AT yahoo 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> In-Reply-To: <592384.26227.qm@web52612.mail.re2.yahoo.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-IsSubscribed: yes Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , 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 1:36 PM: > Hii > > Using ftell() after fopen(..., "a") returns 0 even when the file open for appending is not empty. AFAIK, it should return the size of the file. Not a bug. POSIX allows this behavior, and Linux does it as well. POSIX also allows BSD behavior of seeking to the end, although this is less friendly to reading back a file opened with fopen(...,"a+"). So portable programs can't expect either situation, and you MUST use fseek when opening for append if you expect a particular position. - -- 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/ iEYEARECAAYFAkr9xGoACgkQ84KuGfSFAYC8CACgtx1ZxOtKVaGF2xk2UHg+1B7c 7cUAniO/T6EOm0gxRRx/1wsCM6P2HXXl =xedo -----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