POSIX doesn't stop linux from introducing new, non-posix APIs. Eg, io_uring isn't part of POSIX but linux has it anyway. As far as I can tell, an API for write

POSIX doesn't stop linux from introducing new, non-posix APIs. Eg, io_uring isn't part of POSIX but linux has it anyway. As far as I can tell, an API for write barriers, grouped writes, transactional writes or iocp should be able to work alongside the POSIX API just fine. Its just another API for writing files which user programs can opt in to using.