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From: jack@mcvax.cwi.nl (Jack Jansen)
Newsgroups: comp.unix.wizards
Subject: How are mailfiles locked under 4.n and System III/V?
Message-ID: <7384@boring.mcvax.cwi.nl>
Date: Wed, 13-May-87 14:57:45 EDT
Article-I.D.: boring.7384
Posted: Wed May 13 14:57:45 1987
Date-Received: Sat, 16-May-87 04:17:47 EDT
Organization: AMOEBA project, CWI, Amsterdam
Lines: 18


A question for various wizards out there:

How do various unices lock mailfiles?

I know about V7 (make a file /usr/tmp/lock.USERNAME, yuck) and
2.9BSD (set the execute bits, slightly-less-yuck), but not how
other unices do this.

I would be very grateful if people who know could tell me.

(As an aside, I went through the sources of 4.3 sendmail,
expecting an flock() call or something similar,
but couldn't find *anything* that resembled locking. What am I
missing?)
-- 
	Jack Jansen, jack@cwi.nl (or jack@mcvax.uucp)
	The shell is my oyster.