[phendrenad2]

The BSD kernels (Net, Open, and Free). So many interlocking layers of C macros and typedefs, so many layers of "security features"(1) that are copy-pasted all over the codebase (such that a very simple syscall might be two lines of actual code and 200 lines of boilerplate copy-pasted security features). But I got my tasks done, and swore to never touch kernel dev again.

(1) - Actually, what I'm calling actual security features, plus jails and zones and Linux compat layers and performance counters and debug systems and obscure compile options and features that haven't been used by a soul since 2004.

[extasia]

This is sort of what puts me off trying to do kernel work tbh.. I'm a C intermediate but dealing with mountains of other people's macros scares me to death.