i would really like to have arc4random(9) in libkern, both for easy access to better random number source, as well as source code compatibility with other *BSD (OpenBSD and FreeBSD already have one). any objections/comments? i plan to get source code from FreeBSD libkern/arc4random.c (beer-ware license), as OpenBSD arc4random9() is tightly integrated into rnd(4). itojun