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I'm curious, is the xnu kernel based on FreeBSD, OpenBSD, or some other BSD distribution?

Thank you,

James Pedersen

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From https://github.com/apple-oss-distributions/xnu

What is XNU?

XNU kernel is part of the Darwin operating system for use in macOS and iOS operating systems. XNU is an acronym for X is Not Unix. XNU is a hybrid kernel combining the Mach kernel developed at Carnegie Mellon University with components from FreeBSD and a C++ API for writing drivers called IOKit. XNU runs on x86_64 for both single processor and multi-processor configurations.

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