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From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>)
Newsgroups: net.unix
Subject: Re: file system query
Message-ID: <10432@brl-tgr.ARPA>
Date: Sun, 5-May-85 03:49:07 EDT
Article-I.D.: brl-tgr.10432
Posted: Sun May  5 03:49:07 1985
Date-Received: Tue, 7-May-85 20:48:12 EDT
References: <10195@brl-tgr.ARPA> <220@ki4pv.UUCP>
Organization: Ballistic Research Lab
Lines: 9

> Opening for append using [see] fopen(3) does not cause anything
> of great magic to happen to the op system.  The basic procedure
> involved is:
>	...

NO!  O_APPEND is enforced inside the kernel and causes true
append, atomic within reasonable sizes of write requests.
Several processes can append to the same file without clobbering
each others' records.  Indeed, that is why O_APPEND was invented.