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From: peter@sugar.UUCP (Peter da Silva)
Newsgroups: comp.unix.wizards,comp.arch
Subject: Re: FSF
Message-ID: <782@sugar.UUCP>
Date: Sun, 20-Sep-87 15:52:06 EDT
Article-I.D.: sugar.782
Posted: Sun Sep 20 15:52:06 1987
Date-Received: Sun, 20-Sep-87 23:46:02 EDT
References: <2748@eecae.UUCP>
Organization: Sugar Land UNIX - Houston, TX
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> [why not replace fork() with spawn()]

[spawn == load-and-execute a new program]

Have you ever used a system where the basic process creation primitive
was spawn? There's lots of stuff you can't do. fork() is a more powerful
tool than spawn(). It'd be nice to have both, but not necessary.

> [how do you implement fork in an IBM-PC]

You copy the whole address space. No big deal: it's less than 128K.

> [how can you force users not to overwrite segment registers in IBM-PC UNIX]

You can't. It's not a 100% secure system, but it's fine for a personal
computer.
-- 
-- Peter da Silva `-_-' ...!hoptoad!academ!uhnix1!sugar!peter
--                 'U`  Have you hugged your wolf today?