From owner-freebsd-questions@freebsd.org Sat Apr 4 21:05:28 2020 Return-Path: Delivered-To: freebsd-questions@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 ECB6A2A2E47 for ; Sat, 4 Apr 2020 21:05:27 +0000 (UTC) (envelope-from 4250.82.1d4c100015849ff.7554476b82c8cc03f7214b8665caf4f9@email-od.com) Received: from s1-b0c6.socketlabs.email-od.com (s1-b0c6.socketlabs.email-od.com [142.0.176.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 48vq7s69Ysz43VB for ; Sat, 4 Apr 2020 21:05:13 +0000 (UTC) (envelope-from 4250.82.1d4c100015849ff.7554476b82c8cc03f7214b8665caf4f9@email-od.com) DKIM-Signature: v=1; a=rsa-sha256; d=email-od.com;i=@email-od.com;s=dkim; c=relaxed/relaxed; q=dns/txt; t=1586034314; x=1588626314; h=content-transfer-encoding:content-type:mime-version:references:in-reply-to:message-id:subject:cc:to:from:date:x-thread-info; bh=YuonHQjwlhdofoHyQ3R+U9nIxa6hdjSHhsfNo8mQuQc=; b=G/mANfR2K/sjm0tH2JEX6LFOh+ukt5VHeCYJ3pCVDcsQZhpCMNtwG2Pj/Gv50TTqRAk5p6IWRHzHm7hhHKPlzepFP4dYd19O10eHGsovXknOj/Eoe+7Huqtblf9dALSOWrw5sTPmsA6hkHbVjoo75Cbq3qN0vjqrtvqfnpLT47Y= X-Thread-Info: NDI1MC45Mi4xZDRjMTAwMDE1ODQ5ZmYuZnJlZWJzZC1xdWVzdGlvbnM9ZnJlZWJzZC5vcmc= Received: from r2.us-east-1.aws.in.socketlabs.com (r2.us-east-1.aws.in.socketlabs.com [142.0.191.2]) by mxsg2.email-od.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Sat, 4 Apr 2020 17:04:55 -0400 Received: from smtp.lan.sohara.org (EMTPY [185.202.17.215]) by r2.us-east-1.aws.in.socketlabs.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Sat, 4 Apr 2020 17:04:55 -0400 Received: from [192.168.63.1] (helo=steve.lan.sohara.org) by smtp.lan.sohara.org with smtp (Exim 4.92.3 (FreeBSD)) (envelope-from ) id 1jKpyH-0005er-Tp; Sat, 04 Apr 2020 22:04:54 +0100 Date: Sat, 4 Apr 2020 22:04:53 +0100 From: Steve O'Hara-Smith To: freebsd-questions@freebsd.org Cc: Polytropon Subject: Re: Direct control of parallel port data lines Message-Id: <20200404220453.7bf2d61465ca1880acd34e45@sohara.org> In-Reply-To: <20200404204727.cd2a4042.freebsd@edvax.de> References: <20200404204727.cd2a4042.freebsd@edvax.de> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.32; amd64-portbld-freebsd12.0) X-Clacks-Overhead: "GNU Terry Pratchett" Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 48vq7s69Ysz43VB X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=pass header.d=email-od.com header.s=dkim header.b=G/mANfR2; dmarc=none; spf=temperror (mx1.freebsd.org: error in processing during lookup of 4250.82.1d4c100015849ff.7554476b82c8cc03f7214b8665caf4f9@email-od.com: DNS error) smtp.mailfrom=4250.82.1d4c100015849ff.7554476b82c8cc03f7214b8665caf4f9@email-od.com X-Spamd-Result: default: False [-1.07 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.76)[-0.763,0]; R_DKIM_ALLOW(-0.20)[email-od.com:s=dkim]; R_SPF_DNSFAIL(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; MV_CASE(0.50)[]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[sohara.org]; NEURAL_HAM_LONG(-0.88)[-0.878,0]; RCVD_COUNT_THREE(0.00)[4]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[email-od.com:+]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[198.176.0.142.list.dnswl.org : 127.0.15.0]; SPAMHAUS_AUTHBL_RECEIVED_FAIL(0.00)[215.17.202.185.khpj7ygk5idzvmvt5x4ziurxhy.authbl.dq.spamhaus.net:query timed out]; IP_SCORE(0.07)[ip: (-0.24), ipnet: 142.0.176.0/22(0.44), asn: 7381(0.19), country: US(-0.05)]; FORGED_SENDER(0.30)[steve@sohara.org,4250.82.1d4c100015849ff.7554476b82c8cc03f7214b8665caf4f9@email-od.com]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:7381, ipnet:142.0.176.0/22, country:US]; FROM_NEQ_ENVFROM(0.00)[steve@sohara.org,4250.82.1d4c100015849ff.7554476b82c8cc03f7214b8665caf4f9@email-od.com]; MID_RHS_MATCH_FROM(0.00)[] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 04 Apr 2020 21:05:28 -0000 On Sat, 4 Apr 2020 20:47:27 +0200 Polytropon wrote: > For an "external relay control unit", I need to activate > certain lines of the parallel port. I wish to address > the 8 output lines of the port. How is this done on > FreeBSD? > If possible, I want to use C for this task. I checked > "man ppc" and "man ppi", but I don't find their content > convincing, probably not what I'm looking for. > > What am I _actually_ looking for? ppi is exactly what you are looking for, but it will be strange given where you're coming from. There is a huge difference between a protected mode multi-tasking OS like FreeBSD and a real mode program loader like DOS when it gets to this kind of thing. -- Steve O'Hara-Smith