interface fs 6400;

func open[0](path: string, flags: int) -> (err: int);
func close[1]() -> (err: int);

func read[2](count: size) -> (err: int, nr_read: size, data: buffer);
func write[3](data: buffer) -> (err: int, nr_written: size);

func map[4](prot: int, flags: int) -> (vmo: handle);