Comment by adrian_b
1 month ago
The header mentioned by you does not belong to Linux.
It is a glibc header. It is the right header to use when you invoke syscalls using the generic syscall wrappers provided by glibc.
However, glibc frequently is not synchronized with your current Linux kernel, but with some older version, so this header typically does not contain the most recently added syscalls. Even for the older syscalls, I am not certain that glibc provides all of them.
The authoritative list of syscalls must be gathered from the Linux kernel headers, not from glibc. What must be done for this is not as simple as you would expect, hence the several places mentioned by various posters where this tedious work has been done.
True, I've had to deal with that for newer syscalls and the few that glibc neglects to cover. I didn't mention it, and I suppose the original post was about lack of kernel documentation, so mentioning a glibc source (or musl or whatever) is misleading in a way I didn't originally consider.