#include <sys/random.h>
sys/random.h
functiongetentropy
__OSX_AVAILABLE(10.12) __IOS_AVAILABLE(10.0) __TVOS_AVAILABLE(10.0) __WATCHOS_AVAILABLE(3.0) int getentropy(void* buffer, size_t size)
man page · October 2 2015
getentropy(2) — get entropy__OSX_AVAILABLE(10.12) __IOS_AVAILABLE(10.0) __TVOS_AVAILABLE(10.0) __WATCHOS_AVAILABLE(3.0) int getentropy(void* buffer, size_t size)