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> man pages present the libc implementation

No, the section 3 man pages for "syscalls" are the libc wrapper functions. But section 2 is the syscalls themselves, and includes man pages for syscalls that don't have wrapper functions.

I don't think those man pages include the numbers though, since those numbers are architecture dependent.

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Not really. Even though section 2 should be for "syscalls", it is really only for libc syscall wrappers. Very few pages in the section 2 document the raw syscalls, and those that do say it specifically at the beginning. OTOH, in section 3 you won't find any syscall at all (wrapper or not).

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