[libc-commits] [libc] [libc] Add `FILENO` related macros to `unistd.h`. (PR #124688)

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c8ef wrote:

> A better source to cite rather than the man page is POSIX itself, which mandates these symbolic constants have these specific values.
> 
> https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/unistd.h.html

Got it, thanks for your advice!

https://github.com/llvm/llvm-project/pull/124688