Okay, this is super cool. Thanks for sharing.

In a similar vein, jart's Cosmopolitan libc has a really fun collection of tables that compare various constants across platforms, e.g. syscalls, syscall flags, error numbers, etc. It includes (variants of) Linux, XNU, NT, and the BSDs.

https://github.com/jart/cosmopolitan/blob/master/libc/sysv/c...

In the off chance you haven't heard of Cosmopolitan yet, I hope you find the discovery as much fun as I have.