• OS Mac XNU, the Mac OS X kernel and it's core is based on the Mach micro kernel
    and FreeBSD 5. The Mach layer is responsible for kernel threads,
    processes, pre-emptive multitasking, message-passing, virtual memory
    management and console i/o. Above the Mach layer is the BSD layer that
    supplies the POSIX API, networking and filesystems amongst other things.
    The XNU kernel also has an object oriented device driver framework known
    as the I/O Kit.

    © phrack, issue 0x42

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