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From: guy@sun.uucp (Guy Harris)
Newsgroups: net.lang.c
Subject: Re: Fork and Execl
Message-ID: <3282@sun.uucp>
Date: Sun, 23-Feb-86 06:30:48 EST
Article-I.D.: sun.3282
Posted: Sun Feb 23 06:30:48 1986
Date-Received: Wed, 26-Feb-86 04:27:52 EST
References: <868@umd5.UUCP> <1212@brl-smoke.ARPA>
Distribution: net
Organization: Sun Microsystems, Inc.
Lines: 15

> Neglecting certain funny versions of 4.2 as done by National Semiconductor,
> the fork creates a totally seperate copy of all the nonshared program
> sections....

Other UNIX implementations do "copy-on-write" forks too, such as the paging
S5 versions from AT&T-IS.  I suspect some independently-done paging V7/S3/S5
versions and other 4BSD ports do so.

"copy-on-write" doesn't affect the behavior of programs other than (one
hopes) making them run faster, so even on "copy-on-write" systems one can
think of the fork copying all the nonshared sections.
-- 
	Guy Harris
	{ihnp4, decvax, seismo, decwrl, ...}!sun!guy
	guy@sun.arpa	(yes, really)