No need to get clever about it, or rather it's already been done. ;-) Except for the reseeding bit, getrandom() does that for you by default: blocks if /dev/ura

No need to get clever about it, or rather it's already been done. ;-) Except for the reseeding bit, getrandom() does that for you by default: blocks if /dev/urandom hasn't been seeded yet. At least according to the man page.