[libc-commits] [libc] [libc] add ioctl macros (PR #142080)

[Schrodinger ZHU Yifan via libc-commits]

https://github.com/SchrodingerZhu commented:

Not sure if `_IO` is the most suitable prefix for public header. Otherwise, the patch looks good to me.

https://github.com/llvm/llvm-project/pull/142080