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 seek[4](offset: offset, origin: int) -> (err: int, new_pos: offset);

func map[5](prot: int, flags: int) -> (err: int, vmo: handle);