Function __apple_stack_walkback

util/walkback.c:495–501

#if defined(__APPLE__)
static int __apple_stack_walkback(ucontext_t *context, unsigned maxframes,
                                  void (*handler)(void *returnaddr,
                                                  void *handlerarg),
                                  void *handlerarg)
{
    return 0;
}
#endif

#if defined(__hpux)