Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756949AbbDVDZN (ORCPT ); Tue, 21 Apr 2015 23:25:13 -0400 Received: from mail-lb0-f180.google.com ([209.85.217.180]:34651 "EHLO mail-lb0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756927AbbDVDZI (ORCPT ); Tue, 21 Apr 2015 23:25:08 -0400 MIME-Version: 1.0 In-Reply-To: <1429669228.2207.46.camel@HansenPartnership.com> References: <1429004697-28320-3-git-send-email-hock.leong.kweh@intel.com> <20150414140914.GE5989@kroah.com> <20150415131906.GC21491@kroah.com> <20150417134924.GB19794@kroah.com> <20150417143640.GB3671@codeblueprint.co.uk> <20150420144323.GA7261@kroah.com> <20150421075620.GA11000@kroah.com> <1429665679.2207.44.camel@HansenPartnership.com> <1429669228.2207.46.camel@HansenPartnership.com> From: Andy Lutomirski Date: Tue, 21 Apr 2015 20:24:46 -0700 Message-ID: Subject: Re: [PATCH v4 2/2] efi: an sysfs interface for user to update efi firmware To: James Bottomley Cc: Greg Kroah-Hartman , "Kweh, Hock Leong" , Matt Fleming , Ming Lei , "Ong, Boon Leong" , LKML , "linux-efi@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1394 Lines: 44 On Tue, Apr 21, 2015 at 7:20 PM, James Bottomley wrote: > On Tue, 2015-04-21 at 18:58 -0700, Andy Lutomirski wrote: >> On Tue, Apr 21, 2015 at 6:21 PM, James Bottomley >> wrote: >> > Andy, just on the misc device idea, what about triggering the capsule >> > update from close()? In theory close returns an error code (not sure if >> > most tools actually check this, though). That means we can do the write >> > in chunks but pass it in atomically on the close and cat will work >> > (provided it checks the return code of close). >> >> I thought about this but IIRC cat doesn't check the return value from close. > > It does in my copy (coreutils-8.23) : > > if (!STREQ (infile, "-") && close (input_desc) < 0) > { > error (0, errno, "%s", infile); > ok = false; > } > [...] > if (have_read_stdin && close (STDIN_FILENO) < 0) > error (EXIT_FAILURE, errno, _("closing standard input")); > True, but it's stdout that we care about, not stdin :( --Andy > > James > > -- Andy Lutomirski AMA Capital Management, LLC -- 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/