Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933844Ab0HEWfd (ORCPT ); Thu, 5 Aug 2010 18:35:33 -0400 Received: from terminus.zytor.com ([198.137.202.10]:39869 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760877Ab0HEWfL (ORCPT ); Thu, 5 Aug 2010 18:35:11 -0400 Message-ID: <4C5B3C65.8060703@zytor.com> Date: Thu, 05 Aug 2010 15:34:13 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.7) Gecko/20100720 Fedora/3.1.1-1.fc13 Thunderbird/3.1.1 MIME-Version: 1.0 To: Kay Sievers CC: Greg KH , john stultz , Alexander Shishkin , lkml@vger.kernel.org, "Kirill A. Shutemov" , Thomas Gleixner , Martin Schwidefsky , Andrew Morton , Jon Hunter , Ingo Molnar , Peter Zijlstra , "Paul E. McKenney" , David Howells , Avi Kivity , John Kacur , linux-kernel@vger.kernel.org Subject: Re: [PATCH] [RFC] notify userspace about time changes References: <1280926108-24668-1-git-send-email-virtuoso@slind.org> <1280937526.28884.21.camel@work-vm> <1281042665.3405.15.camel@localhost.localdomain> <20100805213851.GA13868@suse.de> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 832 Lines: 21 On 08/05/2010 03:22 PM, Kay Sievers wrote: > > I think that's really awkward interface, to pass file descriptor > numbers around and write them to magic sysfs files. > > I would very much prefer a file that contains the current time, and > wakes up possible users with a POLL_ERR on changes caused by some > other process. That works very well for things like /proc/mounts, is > easy to get, and does not need a full page of weird instructions to > get stuff done. :) > Okay, what's wrong with having a file descriptor that gets *written to* on a notification? Why POLL_ERR? -hpa -- 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/