OS X pulls some components of FreeBSD into kernel space, but not all (and those are very old at this point). It also uses various BSD bits for userspace. Good

OS X pulls some components of FreeBSD into kernel space, but not all (and those are very old at this point). It also uses various BSD bits for userspace. Good read from horse mouth: https://developer.apple.com/library/archive/documentation/Darwin/Conceptual/KernelProgramming/BSD/BSD.html https://developer.apple.com/library/archive/documentation/Da...