From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030206AbWBGWYA (ORCPT ); Tue, 7 Feb 2006 17:24:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030207AbWBGWYA (ORCPT ); Tue, 7 Feb 2006 17:24:00 -0500 Received: from khc.piap.pl ([195.187.100.11]:13322 "EHLO khc.piap.pl") by vger.kernel.org with ESMTP id S1030206AbWBGWX7 (ORCPT ); Tue, 7 Feb 2006 17:23:59 -0500 To: Pavel Machek Cc: Glen Turner , Alan Cox , Kumar Gala , linux-kernel@vger.kernel.org Subject: Re: 8250 serial console fixes -- issue References: <1138844838.5557.17.camel@localhost.localdomain> <43E2B8D6.1070707@aarnet.edu.au> <20060203094042.GB30738@flint.arm.linux.org.uk> <20060206202654.GC2470@ucw.cz> <20060206205459.GB9388@flint.arm.linux.org.uk> <20060207091804.GA1840@elf.ucw.cz> <20060207174307.GA26558@flint.arm.linux.org.uk> From: Krzysztof Halasa Date: Tue, 07 Feb 2006 23:23:54 +0100 In-Reply-To: <20060207174307.GA26558@flint.arm.linux.org.uk> (Russell King's message of "Tue, 7 Feb 2006 17:43:07 +0000") Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Russell King writes: > In that case the problem is unsolvable. What if I named a process > > \n+++ATH0\n > > ? Oh dear, your modem just hung up. Or maybe: > > \n+++AT&C0\n > > and now your modem always sets DCD active, so even with detection of DCD > in the kernel, I can now talk to it via process names after I've forced > it to disconnect. > > And yes, there's modems out there which accept that and act on the '+++' > immediately - no pause after '+++' required. Correct, but the escape character can usually be disabled with ATS2=128 or something like that. The problem was common some time ago with people putting X-header: +++ATH\n (or was that +++ATH\r ?) in mail headers. -- Krzysztof Halasa