1  #include <dlfcn.h>
       2  
       3  extern int successful_rtld_next_test (void);
       4  extern void *failing_rtld_next_use (void);
       5  
       6  int nextmod1_dummy_var;
       7  
       8  int
       9  successful_rtld_next_test (void)
      10  {
      11    int (*fp) (void);
      12  
      13    /* Get the next function... */
      14    fp = (int (*) (void)) dlsym (RTLD_NEXT, __FUNCTION__);
      15  
      16    /* ...and simply call it.  */
      17    return fp ();
      18  }
      19  
      20  
      21  void *
      22  failing_rtld_next_use (void)
      23  {
      24    void *ret = dlsym (RTLD_NEXT, __FUNCTION__);
      25  
      26    /* Ensure we are not tail call optimized, because then RTLD_NEXT
      27       might return this function.  */
      28    ++nextmod1_dummy_var;
      29    return ret;
      30  }