예제 #1
0
func getRandomLinux(p []byte) (ok bool) {
	once.Do(pickStrategy)
	if !useSyscall {
		return false
	}
	n, err := syscall.GetRandom(p, 0)
	return n == len(p) && err == nil
}
예제 #2
0
func pickStrategy() {
	// Test whether we should use the system call or /dev/urandom.
	// We'll fall back to urandom if:
	// - the kernel is too old (before 3.17)
	// - the machine has no entropy available (early boot + no hardware
	//   entropy source?) and we want to avoid blocking later.
	var buf [1]byte
	n, err := syscall.GetRandom(buf[:], syscall.GRND_NONBLOCK)
	useSyscall = n == 1 && err == nil
}