[libc-commits] [libc] Add named posix semaphore lifetime operations on linux (PR #192278)

[Pengxiang Huang via libc-commits]

Pengxiang-Huang wrote:

I also rebased my changes. Likely the `mmap` and `munmap` wrappers has been landed recently. 

https://github.com/llvm/llvm-project/pull/192278