malloc_size(3) BSD Library Functions Manual malloc_size(3)
malloc_good_size, malloc_size -- memory allocation information
#include <malloc/malloc.h> size_t malloc_good_size(size_t size); size_t malloc_size(const void *ptr);
The malloc_size() function returns the size of the memory block that backs the allocation pointed to by ptr. The memory block size is always at least as large as the allocation it backs, and may be larger. The malloc_good_size() function rounds size up to a value that the allo- cator implementation can allocate without adding any padding; it then returns that rounded-up value.
malloc(3) BSD May 23, 2006 BSD
Mac OS X 10.8 - Generated Wed Aug 29 05:55:48 CDT 2012