I’m probably going to be downvoted for this, but anyway: the single unix specification has always been the only place where i could find C headers documentation in by header file.

Meaning: i don’t want to know all the 6000 functions glibc support, i want to know what will (for example) net/inet.h will bring to my code (ideally with documentation).

For sonme reason that doesn’t seem to be a thing. Not for glibc for sure. But the SUS does that. And i like it.