+extern void * (*volatile real_memcpy)(void * dst, const void *src, size_t n);
+extern void * (*volatile real_memmove)(void * dst, const void *src, size_t len);
+extern void (*volatile real_bzero)(void * dst, size_t len);
+extern void * (*volatile real_memset)(void * dst, int c, size_t len);
+