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While it has a bunch of FreeBSD code stuffed into it, it's not actually based on it.

Yeah I hear this statement a lot too but macos is based on nextstep much more than it was on FreeBSD.

Of course nextstep borrowed some userland from FreeBSD and I think this is where the confusion originates. The actual kernel is totally different though.

And I think the userland got a bit of a refresh from current FreeBSD when OS-X came out.

Eh, sort of. NextStep was more 4.4BSD based. MacOS trasitioned to FreeBSD elements.

And the kernel space for both absolutely have a lot of BSD code, more than the Mach or IO/Kit portions last time I checked.

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