From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932330AbXCJWrA (ORCPT ); Sat, 10 Mar 2007 17:47:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932371AbXCJWq7 (ORCPT ); Sat, 10 Mar 2007 17:46:59 -0500 Received: from ug-out-1314.google.com ([66.249.92.171]:27992 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932330AbXCJWq6 (ORCPT ); Sat, 10 Mar 2007 17:46:58 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=beta; h=received:from:to:subject:date:user-agent:cc:references:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:message-id; b=knbX0k1RTwsL/i1NjZSUo9mq21qqDBEmYMsl5vrhMAAN8AzDnbasynJ2zBxaTj9PlMsYclO3VkQKULOwSDdVK10yQ7pQCk5F91xQ9fL39/gQ3cG9612tannr7z4Okec3xl2RhB3K4oONxYfTbV8K69hd9L2qKPIyyWvQt+KFx3I= From: Denis Vlasenko To: Mockern@yandex.ru Subject: Re: Problem: cat < /dev/my_ttyS0 is not blocked Date: Sat, 10 Mar 2007 23:43:31 +0100 User-Agent: KMail/1.8.2 Cc: linux-kernel@vger.kernel.org References: <45F2A1B5.000006.27583@webmail15.yandex.ru> In-Reply-To: <45F2A1B5.000006.27583@webmail15.yandex.ru> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200703102343.31135.vda.linux@googlemail.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Saturday 10 March 2007 13:16, Mockern wrote: > I have a problem with cat < /dev/my_ttyS0 (see strace output below). > cat function is not blocked. I don't understand why it is not stopped > at read(0, __ and terminated? > Thank you Because /dev/my_ttyS0 is probaly a null file. Please show output of 'ls -l /dev/*ttyS*' -- vda