Originally posted by aht0
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It's not only some of the userland. The kernel is based on an older version of the FreeBSD Kernel. There are drivers and stacks, such as the TCP/IP stack, that are based on the FreeBSD kernel. The Messaging Mac OS uses is based on the original Mach experiments in FreeBSD kernel. Mac OS is a BSD, based on FreeBSD. It used to support the UFS disk format for this reason.
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