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Date:      Sun, 28 May 2000 16:47:29 +0200
From:      Poul-Henning Kamp <phk@critter.freebsd.dk>
To:        bpechter@shell.monmouth.com
Cc:        freebsd-hackers@FreeBSD.ORG, dhh@androcles.com
Subject:   Re: Linux and FreeBSD dual universe 
Message-ID:  <21049.959525249@critter.freebsd.dk>
In-Reply-To: Your message of "Sun, 28 May 2000 06:41:58 EDT." <200005281042.GAA54833@bg-tc-ppp32.monmouth.com> 

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In message <200005281042.GAA54833@bg-tc-ppp32.monmouth.com>, Bill Pechter write
s:
>> Date: Thu, 25 May 2000 09:42:51 -0700 (PDT)
>> From: "Duane H. Hesser" <dhh@androcles.com>
>> Subject: Re: FreeBSD kernel as a replacement for Linux kernel
>> 
>> Anyone remember the old Pyramid OSX 'universe' command?
>> 
>> command like "att ls", or even "att cc ....".  The universe was
>> marked by a flag which affected the interpretation of "conditional
>> symbolic links".  A separate syscall was available to create

It did nøt use variant symbolic links, it used a namei hack.

If you had a directory containing:
	.
	..
	.ucbfoo
	.attfoo
	bar

and you were in universe "ucb" you would see:
	.
	foo
	bar

where "foo" would take you to ".ucbfoo"

it was that simple.

--
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD coreteam member | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.


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