From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 21 May 2001 16:20:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 21 May 2001 16:19:56 -0400 Received: from cisco7500-mainGW.gts.cz ([194.213.32.131]:55300 "EHLO bug.ucw.cz") by vger.kernel.org with ESMTP id ; Mon, 21 May 2001 16:19:40 -0400 Message-ID: <20010520222320.B2647@bug.ucw.cz> Date: Sun, 20 May 2001 22:23:20 +0200 From: Pavel Machek To: Alexander Viro , Ben LaHaise Cc: torvalds@transmeta.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: Why side-effects on open(2) are evil. (was Re: [RFD w/info-PATCH] device arguments from lookup) In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93i In-Reply-To: ; from Alexander Viro on Sat, May 19, 2001 at 09:57:46AM -0400 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > A lot of stuff relies on the fact that close(open(foo, O_RDONLY)) is a > no-op. Breaking that assumption is a Bad Thing(tm). Then we have a problem. Just opening /dev/ttyS0 currently *has* side effects (it is visible on modem lines from serial port; it can block you forever). If this assumption is somewhere, we should fix that place... Or fix serial ports. Pavel -- I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care." Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org