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From: "John S. Dyson" <toor@dyson.iquest.net>
Message-Id: <199603112320.XAA00292@dyson.iquest.net>
Subject: Re: system() broken while mmap()ing something
To: dawes@rf900.physics.usyd.edu.au (David Dawes)
Date: Mon, 11 Mar 1996 23:20:12 +0000 ()
Cc: j@uriah.heep.sax.de, freebsd-current@freebsd.org
In-Reply-To: <199603120252.NAA01086@rf900.physics.usyd.edu.au> from "David Dawes" at Mar 12, 96 01:52:29 pm
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> 
> >> I've attached a test program that does demonstrate a problem.  The program
> >> isn't what I originally had in mind.  This one mmaps the BIOS, and in three
> >> phases it "writes" to it, and reads back the result.  Since the BIOS is
> >> read-only, mismatches should occur in each phase, however on FreeBSD-current,
> >> the last phase (after a system("/bin/ls > /tmp/l")) reports no mismatches.
> >> On FreeBSD-2.0.5, mismatches are correctly reported at each phase.
> >
>
I have committed a temporary fix for the problem.  It will work fine,
except that I want to clean it up a bit later on.  Still working on the map
problem (that is probably causing panics.)

John
dyson@freebsd.org