read(fd Int, address *Any, length Int) -> Int { return syscall(0, fd, address, length) } write(fd Int, address *Any, length Int) -> Int { return syscall(1, fd, address, length) } open(path *Any, flags Int, mode Int) -> Int { return syscall(2, path, flags, mode) } close(fd Int) -> Int { return syscall(3, fd) }