From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751621AbbATIKF (ORCPT ); Tue, 20 Jan 2015 03:10:05 -0500 Received: from mail-wi0-f175.google.com ([209.85.212.175]:52660 "EHLO mail-wi0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750764AbbATIKD (ORCPT ); Tue, 20 Jan 2015 03:10:03 -0500 Message-ID: <54BE0D56.5090301@gmail.com> Date: Tue, 20 Jan 2015 09:09:58 +0100 From: "Michael Kerrisk (man-pages)" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 MIME-Version: 1.0 To: Florian Weimer , David Herrmann , Greg Kroah-Hartman , Daniel Mack CC: mtk.manpages@gmail.com, Arnd Bergmann , "Eric W. Biederman" , One Thousand Gnomes , Tom Gundersen , Jiri Kosina , Andy Lutomirski , Linux API , linux-kernel , Djalal Harouni Subject: Re: kdbus: add documentation References: <1416546149-24799-1-git-send-email-gregkh@linuxfoundation.org> <1416546149-24799-2-git-send-email-gregkh@linuxfoundation.org> <871tolysbb.fsf@mid.deneb.enyo.de> <87vblwtxee.fsf@mid.deneb.enyo.de> In-Reply-To: <87vblwtxee.fsf@mid.deneb.enyo.de> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Daniel, David, On 11/30/2014 06:23 PM, Florian Weimer wrote: > * David Herrmann: > >> On Sun, Nov 30, 2014 at 10:02 AM, Florian Weimer wrote: >>> * Greg Kroah-Hartman: >>> >>>> +7.4 Receiving messages > >>> What happens if this is not possible because the file descriptor limit >>> of the processes would be exceeded? EMFILE, and the message will not >>> be received? >> >> The message is returned without installing the FDs. This is signaled >> by EMFILE, but a valid pool offset. > > Oh. This is really surprising, so it needs documentation. But it's > probably better than the alternative (return EMFILE and leave the > message stuck, so that you receive it immediately again—this behavior > makes non-blocking accept rather difficult to use correctly). So, was this point in the end explicitly documented? I not obvious that it is documented in the revised kdbus.txt that Greg K-H sent out 4 days ago. Thanks, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/