From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Andreas Schwab Newsgroups: gmane.emacs.devel Subject: Re: `message' not outputting the newline "atomically" Date: Wed, 19 Jun 2019 18:05:56 +0200 Message-ID: References: <83y31xr3aa.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="83097"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.2.90 (gnu/linux) Cc: Eli Zaretskii , emacs-devel@gnu.org To: Lars Ingebrigtsen Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Jun 19 18:12:27 2019 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1hddCE-000LRp-SB for ged-emacs-devel@m.gmane.org; Wed, 19 Jun 2019 18:12:26 +0200 Original-Received: from localhost ([::1]:40066 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hddC7-00033H-UM for ged-emacs-devel@m.gmane.org; Wed, 19 Jun 2019 12:12:22 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:53506) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hdd67-00005E-9x for emacs-devel@gnu.org; Wed, 19 Jun 2019 12:06:08 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hdd66-0003LR-8l for emacs-devel@gnu.org; Wed, 19 Jun 2019 12:06:07 -0400 Original-Received: from mx2.suse.de ([195.135.220.15]:55628 helo=mx1.suse.de) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hdd5z-00036H-0S; Wed, 19 Jun 2019 12:06:00 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Original-Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 1A8D0ADDD; Wed, 19 Jun 2019 16:05:57 +0000 (UTC) X-Yow: I have a very good DENTAL PLAN. Thank you. In-Reply-To: (Lars Ingebrigtsen's message of "Wed, 19 Jun 2019 17:47:05 +0200") X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x (no timestamps) [generic] X-Received-From: 195.135.220.15 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:237914 Archived-At: On Jun 19 2019, Lars Ingebrigtsen wrote: > Eli Zaretskii writes: > >> I agree with Andreas: we aren't. It's just sheer luck if this happens >> (probably because the time window for mixing output is small). > > No, we are on all Unix-like OS-es I'm familiar with, and certainly on > GNU/Linux: If you output data that's less than PIPE_BUF in length, a > write(2) call will never interleave the data. Noninteractively, message goes to stderr, which is unbuffered by default. Andreas. -- Andreas Schwab, SUSE Labs, schwab@suse.de GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different."