Add stubs for open(), close() and unlink()
Add placeholder for <ux/linux/fcntl.h>
Add <ux/darwin/fcntl.h>
Add kernel-specific fcntl.h includes.
Add stubs for open(), close() and unlink()
Add parameter names and comments for close() and unlink()
Add tests for opening, writing, closing and unlinking.
Add additional diagnostics; check close() return value.