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 3317 invoked from network); 21 Feb 2021 22:41:43 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 21 Feb 2021 22:41:43 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 145F39CABD; Mon, 22 Feb 2021 08:41:38 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 988A393D39; Mon, 22 Feb 2021 08:41:06 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 68BA593D39; Mon, 22 Feb 2021 08:41:02 +1000 (AEST) Received: from nsstlmta39p.bpe.bigpond.com (nsstlmta39p.bpe.bigpond.com [203.38.21.39]) by minnie.tuhs.org (Postfix) with ESMTPS id 017A793D32 for ; Mon, 22 Feb 2021 08:41:00 +1000 (AEST) Received: from smtp.telstra.com ([10.10.24.4]) by nsstlfep39p-svc.bpe.nexus.telstra.com.au with ESMTP id <20210221224058.TQQY8881.nsstlfep39p-svc.bpe.nexus.telstra.com.au@smtp.telstra.com> for ; Mon, 22 Feb 2021 09:40:58 +1100 X-RG-Spam: Unknown X-RazorGate-Vade: gggruggvucftvghtrhhoucdtuddrgeduledrkedugdduieduucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuuffpveftpgfvgffnuffvtfetpdfqfgfvnecuuegrihhlohhuthemucegtddtnecunecujfgurhepfffhvffujgfkfhgfgggtsehttddttddtredvnecuhfhrohhmpeffrghvvgcujfhorhhsfhgrlhhluceouggrvhgvsehhohhrshhfrghllhdrohhrgheqnecuggftrfgrthhtvghrnhepkeeiteejueeuhfefgeeuvdduieefvedugfevtdffkefhffejkefhuddtteehtefhnecukfhppeduuddtrddugedurdduleefrddvfeefnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehhvghloheprghnvghurhhinhdrhhhorhhsfhgrlhhlrdhorhhgpdhinhgvthepuddutddrudeguddrudelfedrvdeffedpmhgrihhlfhhrohhmpeeouggrvhgvsehhohhrshhfrghllhdrohhrgheqpdhrtghpthhtohepoehtuhhhshesthhuhhhsrdhorhhgqe 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 5FE6CCD0100DFECC for tuhs@tuhs.org; Mon, 22 Feb 2021 09:40:58 +1100 Received: from aneurin.horsfall.org (localhost [127.0.0.1]) by aneurin.horsfall.org (8.15.2/8.15.2) with ESMTP id 11LMewT6066495 for ; Mon, 22 Feb 2021 09:40:58 +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 11LMewAJ066492 for ; Mon, 22 Feb 2021 09:40:58 +1100 (EST) (envelope-from dave@horsfall.org) X-Authentication-Warning: aneurin.horsfall.org: dave owned process doing -bs Date: Mon, 22 Feb 2021 09:40:57 +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] Abstractions 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 Sat, 20 Feb 2021, M Douglas McIlroy wrote: >> - separation of code and data using read-only and read/write file >> systems > > I'll bite. How do you install code in a read-only file system? And where > does a.out go? I once worked for a place who reckoned that /bin and /lib etc ought to be in an EEPROM; I reckon that he was right (Penguin/OS dumps everything under /usr/bin, for example). > My guess is that /bin is in a file system of its own. Executables from > /letc and /lib are probably there too. On the other hand, I guess users' > personal code is still read/write. That's how we ran our RK-05 11/40s since Ed 5... Good fun writing a DJ-11 driver from the DH-11 source; even more fun when I wrote a UT-200 driver from the manual alone (I'm sure that "ei.c" is Out There Somewhere), junking IanJ's driver. The war stories that I could tell... > I agree that such an arrangement is prudent. I don't see a way, though, > to update bin without disrupting most running programs. Change is inevitable; the trick is to minimise the disruption. -- Dave, who carried RK-05s all over the UNSW campus