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From: cwd@cuae2.UUCP (Chris Donahue)
Newsgroups: net.sources.games
Subject: Re: problems with galaxy/robots/others on Sys V Rel 2
Message-ID: <338@cuae2.UUCP>
Date: Sun, 16-Jun-85 21:59:36 EDT
Article-I.D.: cuae2.338
Posted: Sun Jun 16 21:59:36 1985
Date-Received: Tue, 18-Jun-85 04:33:52 EDT
References: <739@burl.UUCP>
Organization: AT&T-IS, /app/eng, Lisle, IL
Lines: 19

> The problems mentioned compiling galaxy, robots, and others are
> due to the use of the flock() utility of BSD, which Sys V does
> not have.  flock() is a general-purpose advisory lock routine
> for files (i.e., we want to make sure that two players aren't
> writing the score file at the exact same time).
> 
> I am too swamped at the moment to write a public-domain version
> of flock(), and from the hell I caught last time I posted something
> MUCH more trivial than flock()  [dup2()] that I had written myself,
> I don't think I'd be able to do so anyway.

UNIX System V Rel. 2 does support file locking through the fcntl system
call. Use the GETLK, SETLK, SETWLK commands with fcntl as a substitute
for flock. A replacement for flock would be a 2-5 line subroutine
at the most.

Chris Donahue
AT&T Info. Sys.
Application Engineering