Date: Wed, 20 Feb 2002 11:10:27 +0100 From: Brad Knowles <brad.knowles@skynet.be> To: "Mike Meyer" <mwm-dated-1014624071.e0f677@mired.org>, "Crist J. Clark" <cjc@freebsd.org> Cc: chat@freebsd.org Subject: Re: Interesting Comment about Mac OS X Message-ID: <p0510120ab899237dc459@[10.0.1.14]> In-Reply-To: <15475.22471.133842.350510@guru.mired.org> References: <20020219225335.U48401@blossom.cjclark.org> <15475.22471.133842.350510@guru.mired.org>
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At 2:01 AM -0600 2002/02/20, Mike Meyer wrote: > Well, others know better than I, but I thought Mac OS X used the Mach > kernel along with the BSD layer and FreeBSD's userland code. NeXT was > based on the Mach kernel. It may well be that Apple used the NeXT > version of the Mach kernel. In the list of responses to <http://slashdot.org/article.pl?sid=02/02/18/0248248>, we find the following: >> Re:No >> >> by MaxVlast on Mon 18 Feb 03:20PM (Score:4, Interesting) (#3026255) >> (User #103795 Info) http://www.sla.to/ [ Neutral ] >> >> Do you know what that means? "Based on NeXT" doesn't mean anything. >> NeXT was a company. >> >> Mac OS X is based on OpenStep 4.2, which, itself, was based on >> NEXTSTEP 3.3. NEXTSTEP is a BSD operating system running on a >> modified version of the Mach microkernel. OpenStep is a API >> specification and a set of libraries that conforms to that API. >> OpenStep 4.2 (the operating system) is an implementation of those >> libraries on top of NEXTSTEP. >> >> When Apple bought NeXT, they planned to build on top of OpenStep. >> They first produced Rhapsody for PPC and Rhapsody for Intel. They >> were the same OS running on two hardware platforms. On top of >> Rhapsody, Apple put the Blue Box, which was a Macintosh >> compatibility environment. At no time was there any need for a "BSD >> compatibility layer." It was all software running on top of BSD. >> Apple then killed Rhapsody for Intel (and the Yellow Box, but that's >> tangential.) >> >> What was left was released as Mac OS Server. >> >> Mac OS X 10.0 and Mac OS Server 10.0 (and further versions) are also >> BSD operating systems. They have the Cocoa (OpenStep) and Carbon >> libraries available, and the imaging system is called Aqua >> (replacement for Display PostScript.) At no point in any of this is >> there a need for any UNIX compatibility layer, as it is all real >> UNIX. The only compatibility environment necessary is for Mac OS 9 >> (Classic.) Only certain older applications (Carbon) can run natively >> on OS X, so for running non-Carbon apps, Mac OS 9 is run in a >> compatibility environment (similar, but not the same as VMWare.) >> >> I hope that clarifies things. >> >> -- >> There should be a moratorium on the use of the apostrophe. >> Max V. >> NeXTMail/MIME Mail welcome This is the best description I've seen yet of the various underpinnings of the MacOS X operating system. -- Brad Knowles, <brad.knowles@skynet.be> Do you hate Microsoft? Do you hate Outlook? Then visit the Anti-Outlook page at <http://www.rodos.net/outlook/>; and see how much fun you can have. "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin, Historical Review of Pennsylvania. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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