From owner-freebsd-stable@freebsd.org Mon Jan 6 00:11:01 2020 Return-Path: Delivered-To: freebsd-stable@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 8015F1EB014 for ; Mon, 6 Jan 2020 00:11:01 +0000 (UTC) (envelope-from cmt@burggraben.net) Received: from smtp.burggraben.net (smtp.burggraben.net [88.198.69.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "smtp.burggraben.net", Issuer "Christoph Moench-Tegeder" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 47rbWm1kbcz3x2x for ; Mon, 6 Jan 2020 00:11:00 +0000 (UTC) (envelope-from cmt@burggraben.net) Received: from elch.exwg.net (elch.exwg.net [IPv6:2001:470:7120:1:127b:44ff:fe4f:148d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "elch.exwg.net", Issuer "Christoph Moench-Tegeder" (not verified)) by smtp.burggraben.net (Postfix) with ESMTPS id 80150C00308; Mon, 6 Jan 2020 01:10:57 +0100 (CET) Received: by elch.exwg.net (Postfix, from userid 1000) id 35A8A139892; Mon, 6 Jan 2020 01:10:57 +0100 (CET) Date: Mon, 6 Jan 2020 01:10:57 +0100 From: Christoph Moench-Tegeder To: Peter Cc: freebsd-stable@freebsd.org Subject: Re: session mgmt: does POSIX indeed prohibit NOOP execution? Message-ID: <20200106001057.GA64665@elch.exwg.net> Mail-Followup-To: Peter , freebsd-stable@freebsd.org References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.13.2 (2019-12-18) X-Rspamd-Queue-Id: 47rbWm1kbcz3x2x X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of cmt@burggraben.net designates 88.198.69.140 as permitted sender) smtp.mailfrom=cmt@burggraben.net X-Spamd-Result: default: False [-3.28 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:88.198.69.140]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[burggraben.net]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_MED(-0.20)[140.69.198.88.list.dnswl.org : 127.0.6.2]; RCPT_COUNT_TWO(0.00)[2]; IP_SCORE(-1.78)[ip: (-9.71), ipnet: 88.198.0.0/16(2.33), asn: 24940(-1.51), country: DE(-0.02)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; SUBJECT_ENDS_QUESTION(1.00)[]; ASN(0.00)[asn:24940, ipnet:88.198.0.0/16, country:DE]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 06 Jan 2020 00:11:01 -0000 ## Peter (peter@citylink.dinoex.sub.org): > When a program is invoked via /usr/sbin/daemon, it should already be > session leader AND group leader, and then the above code WOULD be a > NOOP, unless POSIX would require the setpgid() to fail and thereby the > program to abort - which, btw, is NOT a NOOP :( https://pubs.opengroup.org/onlinepubs/9699919799/ "The setpgid() function shall fail if: [...] The process indicated by the pid argument is a session leader." Not much room to argue? Regards, Christoph -- Spare Space