In NDK yes. Those aren't really as fully compliant as we'd wished (and differences in implementation are sometimes really annoying to deal with).
Nevertheless, vast majority of applications will never include NDK code and even if they will, they probably won't really talk to POSIX calls directly either. For the type of OS Android is, it doesn't really gain anything by being POSIX compliant far away from developer APIs. And Fuchsia, if anything, is trying to be an Android type OS.
Nevertheless, vast majority of applications will never include NDK code and even if they will, they probably won't really talk to POSIX calls directly either. For the type of OS Android is, it doesn't really gain anything by being POSIX compliant far away from developer APIs. And Fuchsia, if anything, is trying to be an Android type OS.