GRND_RANDOM
if (flags & ~(GRND_NONBLOCK | GRND_RANDOM | GRND_INSECURE))
if ((flags & (GRND_INSECURE | GRND_RANDOM)) == (GRND_INSECURE | GRND_RANDOM))
if (unlikely(flags & ~(GRND_NONBLOCK | GRND_RANDOM | GRND_INSECURE)))
#ifndef GRND_RANDOM