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


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