From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp1 ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms11 with LMTPS id AD6nGiodqF9NFwAA0tVLHw (envelope-from ) for ; Sun, 08 Nov 2020 16:30:34 +0000 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp1 with LMTPS id aLpiFiodqF8wTAAAbx9fmQ (envelope-from ) for ; Sun, 08 Nov 2020 16:30:34 +0000 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id 974C69400D3 for ; Sun, 8 Nov 2020 16:30:33 +0000 (UTC) Received: from localhost ([::1]:58644 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kbnaK-0001DK-BI for larch@yhetil.org; Sun, 08 Nov 2020 11:30:32 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:44648) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kbnaC-0001C1-9A for guix-devel@gnu.org; Sun, 08 Nov 2020 11:30:24 -0500 Received: from fencepost.gnu.org ([2001:470:142:3::e]:51572) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kbnaB-0006bv-6T; Sun, 08 Nov 2020 11:30:23 -0500 Received: from [2a01:e0a:1d:7270:af76:b9b:ca24:c465] (port=44034 helo=ribbon) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1kbna8-000053-MP; Sun, 08 Nov 2020 11:30:21 -0500 From: =?utf-8?Q?Ludovic_Court=C3=A8s?= To: Mark H Weaver Subject: Re: RFC: subcommand to pause/resume builds References: <87r1pbzixl.fsf@asu.edu> <87zh3yczss.fsf@gnu.org> <87d00qb362.fsf@netris.org> X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 18 Brumaire an 229 de la =?utf-8?Q?R=C3=A9volution?= X-PGP-Key-ID: 0x090B11993D9AEBB5 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 3CE4 6455 8A84 FDC6 9DB4 0CFB 090B 1199 3D9A EBB5 X-OS: x86_64-pc-linux-gnu Date: Sun, 08 Nov 2020 17:30:17 +0100 In-Reply-To: <87d00qb362.fsf@netris.org> (Mark H. Weaver's message of "Fri, 06 Nov 2020 16:11:54 -0500") Message-ID: <87tutzvmjq.fsf@gnu.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: guix-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: guix-devel@gnu.org Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: "Guix-devel" X-Scanner: ns3122888.ip-94-23-21.eu Authentication-Results: aspmx1.migadu.com; dkim=none; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of guix-devel-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=guix-devel-bounces@gnu.org X-Spam-Score: -1.51 X-TUID: dEwXud7d5Os5 Hi Mark, Mark H Weaver skribis: > Ludovic Court=C3=A8s writes: > >> Last, you=E2=80=99d need to send SIGTSTP to the whole process group of t= he >> build, like so (I think, haven=E2=80=99t tried): >> >> sudo kill -TSTP -123 >> >> where 123 is the =E2=80=9CSessionPID=E2=80=9D shown by =E2=80=98guix pro= cesses=E2=80=99. However, doing >> so may affect build results: processes in the build environment might >> handle SIGTSTP specially, which can have side effects. It=E2=80=99s an >> observable action. > > What's the rationale for using SIGTSTP instead of SIGSTOP here? No good reason; SIGSTOP is safer because it cannot be handled (info "(libc) Job Control Signals"), and thus my argument above is moot. Thanks for the correction! Ludo=E2=80=99.