From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=0.5 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE,RDNS_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.2 Received: (qmail 5860 invoked from network); 9 Mar 2020 23:36:03 -0000 Received-SPF: pass (minnie.tuhs.org: domain of minnie.tuhs.org designates 45.79.103.53 as permitted sender) receiver=inbox.vuxu.org; client-ip=45.79.103.53 envelope-from= Received: from unknown (HELO minnie.tuhs.org) (45.79.103.53) by inbox.vuxu.org with ESMTP; 9 Mar 2020 23:36:03 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 2196C93D97; Tue, 10 Mar 2020 09:35:53 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 14B2893D2A; Tue, 10 Mar 2020 09:35:27 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=fail reason="signature verification failed" (1024-bit key; secure) header.d=tnetconsulting.net header.i=@tnetconsulting.net header.b="oGLmpgdC"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id A9D5D93D06; Tue, 10 Mar 2020 09:34:26 +1000 (AEST) Received: from tncsrv06.tnetconsulting.net (tncsrv06.tnetconsulting.net [45.33.28.24]) by minnie.tuhs.org (Postfix) with ESMTPS id 4435E93D29 for ; Tue, 10 Mar 2020 09:34:25 +1000 (AEST) Received: from Contact-TNet-Consulting-Abuse-for-assistance by tncsrv06.tnetconsulting.net (8.15.2/8.15.2/Debian-3) with ESMTPSA id 029NMagH021596 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO) for ; Mon, 9 Mar 2020 18:22:37 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=tnetconsulting.net; s=2019; t=1583796157; bh=FX10qctW2diMEbXCUoWgCLYwuNa76+6vB+nMOMWwP2U=; h=Subject:To:References:From:Message-ID:Date:User-Agent: MIME-Version:In-Reply-To:Content-Type:Cc:Content-Disposition: Content-Language:Content-Transfer-Encoding:Content-Type:Date:From: In-Reply-To:Message-ID:MIME-Version:References:Reply-To: Resent-Date:Resent-From:Resent-To:Resent-Cc:Sender:Subject:To: User-Agent; b=oGLmpgdCnBctnEf5N0glqptUR3dFruCrOASL4ENqXtOJhcgG5IG7pua6+dnTHlEu3 b0cerMRm/Fx2MRKkfjzutYrCu/dM95ihtIxGQP8EQyXA9TQkyrs6WF54InEfEb+kix OFrZ/wbki0DXGZrubVOZAIXD6RuuQPrJ2yiAylKk= To: tuhs@minnie.tuhs.org References: <20200306224431.D226C18C080@mercury.lcs.mit.edu> Message-ID: <1fab6a1a-ccfb-02cc-c23e-1a0d8c9e954a@spamtrap.tnetconsulting.net> Date: Mon, 9 Mar 2020 17:22:36 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200306224431.D226C18C080@mercury.lcs.mit.edu> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms070102020608010809090702" Subject: Re: [TUHS] First appearance of named pipes 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: , From: Grant Taylor via TUHS Reply-To: Grant Taylor Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" This is a cryptographically signed message in MIME format. --------------ms070102020608010809090702 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 3/6/20 3:44 PM, Noel Chiappa wrote: > a pipe is a FIFO. Hum.... Does that mean that I should be able to replace pipes in my shell=20 commands with a collections of FIFOs? I'm not saying that I would want=20 to. Well, at least not beyond an academic exercise. > RAND ports just allowed (effectively) a pipe to have a name in the=20 > file system. I've got to admit that this statement, particularly the first two words, = caused me a lot of trouble. The first few times I read it I kept=20 thinking that RAND ported something from another platform /=20 architecture. I now think it effectively means "(the) port (solution)=20 from RAND". Suffice it to say that many of the emails in this thread=20 didn't make sense with my first, seemingly incorrect, understanding, and = made a LOT more sense with my second, seemingly correct, understanding. > The implementation of both is pretty straight-forward. A pipe is=20 > just a file which has a maximum length, after which the writer is=20 > blocked. A port is just a pipe (it uses the pipe code) whose inode=20 > appears in the file system. Intriguing. It is interesting learning the history of things that I've taken for=20 granted for 25 years. This thread aligns quite well with some external reading that I've done=20 trying to learn more about file descriptors and redirection. TL;DR:=20 The redirection symbols (syntax) weren't doing what I thought they were=20 doing. I now believe that they change values of variables used for I/O. = Much like DD statements in JCL. --=20 Grant. . . . unix || die --------------ms070102020608010809090702 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC CzkwggUhMIIECaADAgECAhA53zcXtFD9dENby64EqrKqMA0GCSqGSIb3DQEBCwUAMIGWMQsw CQYDVQQGEwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxm b3JkMRgwFgYDVQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENs aWVudCBBdXRoZW50aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMB4XDTE5MTExOTAwMDAw MFoXDTIwMTExODIzNTk1OVowKzEpMCcGCSqGSIb3DQEJARYaZ3RheWxvckB0bmV0Y29uc3Vs dGluZy5uZXQwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCwIZcEJcuE7mUfxJnD I8oOSX/TvAhoP11agD++8L7Ok8fFJhJK0lOVRsq1M6lF2E2Vzuyffg2ppbecWvHcIRadsaiG 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