Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ihnp4!ptsfa!ames!ll-xn!husc6!cmcl2!brl-adm!adm!gonzalez@VAX.BBN.COM
From: gonzalez@VAX.BBN.COM
Newsgroups: comp.unix.questions
Subject: File Access Times on Masscomp
Message-ID: <7855@brl-adm.ARPA>
Date: Mon, 15-Jun-87 14:34:17 EDT
Article-I.D.: brl-adm.7855
Posted: Mon Jun 15 14:34:17 1987
Date-Received: Wed, 17-Jun-87 01:33:00 EDT
Sender: news@brl-adm.ARPA
Lines: 12

In attempting to port a package to Masscomp Unix (aka RTU), I discovered
a filesystem difference between BSD and RTU.  Under RTU, if you attempt
a read of a file that is zero size, the access time is *not* updated.
Under BSD, it is.  I infer from this that BSD counts open(2) calls,
while RTU counts successful read(2) operations.  Since RTU is largely
derived from AT&T, I've wondered whether this is the case under SysV,
or if this behavior is limited to Masscomp systems.  If the latter is 
true, perhaps the difference should be viewed as a bug in RTU?

				-Jim Gonzalez
				 BBN Labs, Inc.
				 gonzalez@vax.bbn.com