From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 32618 invoked from network); 30 Jan 2021 22:27:32 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 30 Jan 2021 22:27:32 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 5C4159C86C; Sun, 31 Jan 2021 08:27:30 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 7B2619C653; Sun, 31 Jan 2021 08:27:17 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id C30FF9C653; Sun, 31 Jan 2021 08:27:15 +1000 (AEST) Received: from nsstlmta11p.bpe.bigpond.com (nsstlmta11p.bpe.bigpond.com [203.38.21.11]) by minnie.tuhs.org (Postfix) with ESMTPS id 016F49C63D for ; Sun, 31 Jan 2021 08:27:14 +1000 (AEST) Received: from smtp.telstra.com ([10.10.24.4]) by nsstlfep11p-svc.bpe.nexus.telstra.com.au with ESMTP id <20210130222712.YZF18700.nsstlfep11p-svc.bpe.nexus.telstra.com.au@smtp.telstra.com> for ; Sun, 31 Jan 2021 09:27:12 +1100 X-RG-Spam: Unknown X-RazorGate-Vade: gggruggvucftvghtrhhoucdtuddrgeduledrfeeggdduieefucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuuffpveftpgfvgffnuffvtfetpdfqfgfvnecuuegrihhlohhuthemucegtddtnecunecujfgurhepfffhvffujgfkfhgfgggtsehttddttddtredvnecuhfhrohhmpeffrghvvgcujfhorhhsfhgrlhhluceouggrvhgvsehhohhrshhfrghllhdrohhrgheqnecuggftrfgrthhtvghrnhepkeeiteejueeuhfefgeeuvdduieefvedugfevtdffkefhffejkefhuddtteehtefhnecukfhppeduuddtrddugedurdduleefrddvfeefnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehhvghloheprghnvghurhhinhdrhhhorhhsfhgrlhhlrdhorhhgpdhinhgvthepuddutddrudeguddrudelfedrvdeffedpmhgrihhlfhhrohhmpeeouggrvhgvsehhohhrshhfrghllhdrohhrgheqpdhrtghpthhtohepoehtuhhhshesthhuhhhsrdhorhhgqe X-RazorGate-Vade-Verdict: clean 0 X-RazorGate-Vade-Classification: clean X-RG-VS-CLASS: clean Received: from aneurin.horsfall.org (110.141.193.233) by smtp.telstra.com (5.8.420) id 5FE6CD1409DB1E27 for tuhs@tuhs.org; Sun, 31 Jan 2021 09:27:12 +1100 Received: from aneurin.horsfall.org (localhost [127.0.0.1]) by aneurin.horsfall.org (8.15.2/8.15.2) with ESMTP id 10UMRBN6067371 for ; Sun, 31 Jan 2021 09:27:11 +1100 (EST) (envelope-from dave@horsfall.org) Received: from localhost (dave@localhost) by aneurin.horsfall.org (8.15.2/8.15.2/Submit) with ESMTP id 10UMRBDW067368 for ; Sun, 31 Jan 2021 09:27:11 +1100 (EST) (envelope-from dave@horsfall.org) X-Authentication-Warning: aneurin.horsfall.org: dave owned process doing -bs Date: Sun, 31 Jan 2021 09:27:10 +1100 (EST) From: Dave Horsfall To: The Eunuchs Hysterical Society In-Reply-To: Message-ID: References: User-Agent: Alpine 2.21.9999 (BSF 287 2018-06-16) X-GPG-Public-Key: http://www.horsfall.org/gpgkey.pub X-GPG-Fingerprint: 05B4 FFBC 0218 B438 66E0 587B EF46 7357 EF5E F58B X-Home-Page: http://www.horsfall.org/ X-Witty-Saying: "chmod 666 the_mode_of_the_beast" MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Subject: Re: [TUHS] reboot(2) system call X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" On Tue, 26 Jan 2021, Greg A. Woods wrote: > The lore I was told at the time was that you alwasy ran three and that > it didn't matter if they were all on the same line with semicolons or > not because of the very fact that the second one would block. What I was taught was: % sync % sync % sync and never: % sync; sync; sync The theory was that by waiting for the shell prompt each time, it gave the buffer pool enough time to be flushed. > The third one was just for superstitious good luck, and just in case > there was a process still running and writing to a filesystem. Never heard that theory, but naturally you did a "ps ax" first, didn't you? -- Dave