OS requirements for arc4random_uniform()
arc4random, bsd, c, ios, macos
Solution
If you look at `stdlib.h` where it is defined, it says:
u_int32_t arc4random_uniform(u_int32_t /*upper_bound*/) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_3);
So it is available from Lion on for desktops and iOS 4.3 on the iPhone.
Problem
How do I find out the minimum OS requirements for using `arc4random_uniform()`? Is it defined in BSD? If so, from what version? Does it run on any Mac OS X version? How about iOS versions? Is there any official place I can find these things out?