Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 2 Mar 2001 04:57:30 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 2 Mar 2001 04:57:20 -0500 Received: from oxmail1.ox.ac.uk ([129.67.1.1]:47036 "EHLO oxmail.ox.ac.uk") by vger.kernel.org with ESMTP id ; Fri, 2 Mar 2001 04:57:03 -0500 Date: Fri, 2 Mar 2001 09:57:02 +0000 From: Malcolm Beattie To: linux-kernel@vger.kernel.org Subject: Re: ftruncate not extending files? Message-ID: <20010302095701.A4685@sable.ox.ac.uk> In-Reply-To:

<20010302084544.A26070@home.ds9a.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0.1i In-Reply-To: <20010302084544.A26070@home.ds9a.nl>; from ahu@ds9a.nl on Fri, Mar 02, 2001 at 08:45:45AM +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org bert hubert writes: > I would've sworn, based on the fact that I saw people do it, that ftruncate > was a legitimate way to extend a file Well it's not SuSv2 standards compliant: http://www.opengroup.org/onlinepubs/007908799/xsh/ftruncate.html If the file previously was larger than length, the extra data is discarded. If it was previously shorter than length, it is unspecified whether the file is changed or its size increased. If ^^^^^^^^^^^ the file is extended, the extended area appears as if it were zero-filled. How "legitimate" relates to "SuSv2 standards compliant" is your call. --Malcolm -- Malcolm Beattie Unix Systems Programmer Oxford University Computing Services - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/