From nobody Sat Apr 23 23:46:16 2022 X-Original-To: freebsd-drivers@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4A1BB19946DD for ; Sat, 23 Apr 2022 23:46:25 +0000 (UTC) (envelope-from jmg@gold.funkthat.com) Received: from gold.funkthat.com (gate2.funkthat.com [208.87.223.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "gate2.funkthat.com", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Km7G82Yqsz3QBX for ; Sat, 23 Apr 2022 23:46:23 +0000 (UTC) (envelope-from jmg@gold.funkthat.com) Received: from gold.funkthat.com (localhost [127.0.0.1]) by gold.funkthat.com (8.15.2/8.15.2) with ESMTPS id 23NNkGP0035960 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sat, 23 Apr 2022 16:46:16 -0700 (PDT) (envelope-from jmg@gold.funkthat.com) Received: (from jmg@localhost) by gold.funkthat.com (8.15.2/8.15.2/Submit) id 23NNkGcS035959; Sat, 23 Apr 2022 16:46:16 -0700 (PDT) (envelope-from jmg) Date: Sat, 23 Apr 2022 16:46:16 -0700 From: John-Mark Gurney To: Yusuf Khan Cc: freebsd-drivers@freebsd.org Subject: Re: How do I write a driver and how do I find out what kernel API calls do? Message-ID: <20220423234616.GK88842@funkthat.com> Mail-Followup-To: Yusuf Khan , freebsd-drivers@freebsd.org References: List-Id: Writing device drivers for FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-drivers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-drivers@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Operating-System: FreeBSD 11.3-STABLE amd64 X-PGP-Fingerprint: D87A 235F FB71 1F3F 55B7 ED9B D5FF 5A51 C0AC 3D65 X-Files: The truth is out there X-URL: https://www.funkthat.com/ X-Resume: https://www.funkthat.com/~jmg/resume.html X-TipJar: bitcoin:13Qmb6AeTgQecazTWph4XasEsP7nGRbAPE X-to-the-FBI-CIA-and-NSA: HI! HOW YA DOIN? can i haz chizburger? User-Agent: Mutt/1.6.1 (2016-04-27) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.4.3 (gold.funkthat.com [127.0.0.1]); Sat, 23 Apr 2022 16:46:16 -0700 (PDT) X-Rspamd-Queue-Id: 4Km7G82Yqsz3QBX X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=none (mx1.freebsd.org: domain of jmg@gold.funkthat.com has no SPF policy when checking 208.87.223.18) smtp.mailfrom=jmg@gold.funkthat.com X-Spamd-Result: default: False [-0.75 / 15.00]; SUBJECT_ENDS_QUESTION(1.00)[]; ARC_NA(0.00)[]; FREEFALL_USER(0.00)[jmg]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; NEURAL_HAM_MEDIUM(-0.95)[-0.955]; MID_RHS_MATCH_FROM(0.00)[]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[funkthat.com]; AUTH_NA(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_HAM_SHORT(-1.00)[-1.000]; RCPT_COUNT_TWO(0.00)[2]; MLMMJ_DEST(0.00)[freebsd-drivers]; FREEMAIL_TO(0.00)[gmail.com]; FORGED_SENDER(0.30)[jmg@funkthat.com,jmg@gold.funkthat.com]; R_SPF_NA(0.00)[no SPF record]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:32354, ipnet:208.87.216.0/21, country:US]; FROM_NEQ_ENVFROM(0.00)[jmg@funkthat.com,jmg@gold.funkthat.com]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-ThisMailContainsUnwantedMimeParts: N Yusuf Khan wrote this message on Thu, Apr 21, 2022 at 18:17 -0500: > Literally just copy paste the title here. > > Also where do I get documentation? Someone else replied w/ a number of helpful resources, but the other thing to look at is section 9 man pages. Not all the interfaces are documented, but a large number of the ones most often used are there. Also, some of the pages from 3 also apply to the kernel as well, such as the usual string manipulation functions. -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."