From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ppsw-52.csi.cam.ac.uk ([131.111.8.152]:48182 "EHLO ppsw-52.csi.cam.ac.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753833Ab1JEIo2 (ORCPT ); Wed, 5 Oct 2011 04:44:28 -0400 Message-ID: <4E8C1AE6.5000701@cam.ac.uk> Date: Wed, 05 Oct 2011 09:52:54 +0100 From: Jonathan Cameron MIME-Version: 1.0 To: Alan Cox CC: "linux-iio@vger.kernel.org" , LKML Subject: Re: IIO (+ more general?) Error condition handling (e.g. wire fell out errors) References: <4E858F5A.5000901@cam.ac.uk> <20110930104707.0645afda@lxorguk.ukuu.org.uk> In-Reply-To: <20110930104707.0645afda@lxorguk.ukuu.org.uk> Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-iio-owner@vger.kernel.org List-Id: linux-iio@vger.kernel.org Sorry for the slow reply! >> 3) Consider these out of band (from the out of band event data) >> and look at other options for reporting them. > > Treat it like a socket/pipe perhaps - if it "goes down" then report it as > having hung up and deliver a SIGPIPE or similar and with an appropriate > error code for those catching it (-EIO ?) I guess that will work. Feels a little clunky, but such is life. > > That generally gets noticed. > >> Is there anything general out there for reporting hardware failures >> that would be appropriate? Sometime these conditions are the sort >> of thing that should cause a siren to go off. >> They might be sensor failure > > There are two things here - one is making sure the app notices (where we > have equivalent handling in other interfaces) the other is what to do > about it. We don't have a general framework for reporting system > component failure. That's something that ought to get fixed generally to > report everything from "that new nasty smell was formerly your hard disk" > to a sensor fail. It does seem like that would be useful. > >> (p.s. I hope no one is using the current driver for trains, though >> that might explain British trains...) > > Tssh... there is Linux on UK trains, but it's usually driving annoying > announcement/video systems. :) Good thing their are no 'this runs Linux' badges on the speakers. I've nothing against them using Linux, just the driver in question which is currently 'interesting'. Thanks, Jonathan