[libc-commits] [libc] [libc] Reject unsupported flags in fchmodat with ENOTSUP (PR #223165)

[Aman Maurya via libc-commits]

amanmaurya92 wrote:

CC @labath @vonosmas - If you have a moment, I'd appreciate any feedback on this fix for `fchmodat`'s syscall wrapper and flag handling.

https://github.com/llvm/llvm-project/pull/223165