On Mon, Oct 5, 2015 at 6:42 PM, Dave Horsfall <d...@horsfall.org> wrote:
> On Sat, 3 Oct 2015, Ryan Schmidt wrote: > > > Remember: under the bonnet (ObUSA: hood) the Mac runs FreeBSD. > > > > OS X is underpinned by Darwin, not FreeBSD. Darwin is based on NeXTSTEP, > > BSD, XNU and other projects, and of course a great deal of independent > > work by Apple. > > You're saying that Darwin was written from scratch and not evolved from a > modified FreeBSD 4.1, or am I thinking of an earlier MacOS? > It was never derived from FreeBSD 4.1. CMU Mach was a custom-written microkernel, hosting an OS which was a heavily modified 4.2BSD (the original Berkeley Source Distribution, long predating FreeBSD). NeXTStep took this and updated it. OS X took that and updated it again, including replacing much of the userspace that was not Darwin-specific with FreeBSD-CURRENT as of that time, and periodically updates those parts of the userspace from the latest FreeBSD-CURRENT. The kernel, however, is still largely custom. Some subsystems were originally borrowed from FreeBSD-CURRENT (the original USB stack, for example), but Apple later rewrote them (and in the case of USB, that was badly needed; FreeBSD still has significant USB stack issues). The core of the kernel is not, however, related to FreeBSD except in being a heavily rewritten version of FreeBSD's ancestor. -- brandon s allbery kf8nh sine nomine associates allber...@gmail.com ballb...@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net
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