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Path: utzoo!watmath!clyde!caip!brl-adm!brl-smoke!smoke!emartin@ardec.arpa
From: emartin@ardec.arpa (FSAC)
Newsgroups: net.unix
Subject: Unibis Device Drivers
Message-ID: <1897@brl-smoke.ARPA>
Date: Wed, 2-Jul-86 11:10:22 EDT
Article-I.D.: brl-smok.1897
Posted: Wed Jul  2 11:10:22 1986
Date-Received: Thu, 3-Jul-86 07:39:01 EDT
Sender: news@brl-smoke.ARPA
Lines: 11


    I am presently trying to understand and modify several Unibus device
drivers on a Vax730 running 4.2BDS Unix.  I understand the majority of code
within these drivers but lose track when certain low level calls such as 
physio() and iodone() etc are executed.  Not having the Unix source code
( at the moment, although its on the way ) its also unclear exactly what Unix
does(for you) when a high level operation such as WRITE is called. Does 
anyone out there know of any readily available resource that would help
me with these problems.
				tks,
					Richard Simpson