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From: gwyn@brl-tgr.ARPA (Doug Gwyn )
Newsgroups: net.database
Subject: Re: locks
Message-ID: <1496@brl-tgr.ARPA>
Date: Sat, 14-Sep-85 07:09:10 EDT
Article-I.D.: brl-tgr.1496
Posted: Sat Sep 14 07:09:10 1985
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Organization: Ballistic Research Lab
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> Does System V and friends have exclusive opens?

On O_CREAT, yes.  SVR2.2 and later also have read/write file/record
cooperative locking.