Darwin is a BSD unix 9298

TheLetterK

That requirement is met, regardless if one even disagrees with you that it is a requirement. As I posted on the 21st of this month:

"XNU, the kernel, is derived from a number of sources, particularly Mach 3.0 and FreeBSD 5.x.

Mach The core of the XNU kernel, Mach, provides kernel threads, message-pbutting (used in inter-process communication), protected memory, virtual memory management, real-time support, kernel debugging support,

and console I-O. The Mach component also allows the OS to host binaries

for multiple distinct CPU architectures within a single file (such as x86 and PowerPC) due to its use of the Mach-O binary format.

BSD The BSD portion of the kernel provides the POSIX API (BSD system calls), the process model, basic security policies, user ids, permissions, the networking code, the virtual filesystem code (including a filesystem independent journalling layer), cryptographic framework, System V IPC, and some of the locking primitives."

End of quoted material.

Mac OS X uses the Xnu kernel which is a fusion of the BSD kernel and the Mach kernel

Any facts that disagree with your opinions are "irrelevant?"