Actually I looked it up on a different site.  The MACK Kernel was 
designed to be a "drop in" replacement  Kernel for BSD with the usual 
UNIX services moved out to other programs.  But I'm beginning to believe 
that it's kind of what your definition of UNIX is.  This is a bit more 
complicated than I at first believed.

http://wapedia.mobi/en/Mach_kernel

Bruce Walker wrote:
> P. J. Alling wrote:
>   
>> I don't want to say Adam is wrong, so I won't, maybe they've found ways 
>> around that.  However the MACH Kernel is based on BSD Unix, it's not 
>> like it's an entirely different animal.
>>     
>
> Yes, the MACH kernel _is_ an entirely different animal, actually.  MACH 
> is a microkernel OS developed at CMU.
>
> There was always a BSD emulation layer that enables all BSD/UNIX code to 
> be compilable for it easily.  That's been enhanced by Apple with Linux 
> libraries as well so almost anything from Linux/BSD can be made to run 
> on Mac OS X.
>
> So the system /looks/ like BSD UNIX for all intents and purposes when 
> you login to a terminal. The disk layout is pretty standard Posix-like 
> stuff, and apps enjoy a BSD experience.  However, it ain't UNIX underneath.
>
> See: http://en.wikipedia.org/wiki/Mach_%28kernel%29
>
> -bmw
>
>
>   


-- 
You get further with a kind word and a gun, than with a kind word alone.
        --Al Capone.


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