sysvicall2(&libc_munmap, uintptr(addr), uintptr(n))
}

const (
	_CLOCK_REALTIME  = 3
	_CLOCK_MONOTONIC = 4
)

//go:nosplit
func nanotime1() int64 {
	var ts mts
	sysvicall2(&libc_clock_gettime, _CLOCK_MONOTONIC, uintptr(unsafe.Pointer(&ts)))
	return ts.tv_sec*1e9 + ts.tv_nsec
}

//go:nosplit
func open(path *byte, mode, perm int32) int32 {