blank_pattern

They seem really big on keeping iOS things secret-ish, but the XNU kernel for both iOS and macOS seem to be built from the same code base.

Up until a couple years ago, they'd strip out ARM specific things from the releases macOS XNU code. Then they started leaving that stuff in!

Apple even open sources their XNU kernel: https://opensource.apple.com/

There's some delay between when a new macOS version comes out and when sources get published, but it's great to see how they use the Mach kernel in practice.