[libc-commits] [libc] [libc][sys/eventfd] Add eventfd_read / eventfd_write convenience functions. (PR #236819)

[Pavel Labath via libc-commits]

https://github.com/labath approved this pull request.

It's worth noting that glibc and musl leave errno untouched in case of short reads (which can only happen when the FD is not really an event FD.). However, I think setting errno makes more sense.

https://github.com/llvm/llvm-project/pull/236819