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Re:Writing a Simple Linux Kernel Module by sigjuice on Thursday November 30, 2017 @03:10PM (#15819066)
The kernel is called XNU. https://opensource.apple.com/source/xnu/ It is mainly written in C.
Re:Writing a Simple Linux Kernel Module by self_awareness on Thursday November 30, 2017 @03:34PM (#15819264)
The BSD part of the kernel is written in C, but IOKit, the kext framework, is written in (a subset of) C++:

http://xr.anadoxin.org/source/xref/macos-10.13-highsierra/xn...