1  #include <stdio.h>
       2  
       3  
       4  extern int successful_rtld_next_test (void);
       5  extern void *failing_rtld_next_use (void);
       6  
       7  
       8  static int
       9  do_test (void)
      10  {
      11    int result;
      12    void *addr;
      13  
      14    /* First try call a function which uses RTLD_NEXT and calls that
      15       function.  */
      16    result = successful_rtld_next_test ();
      17    if (result == 42)
      18      {
      19        puts ("RTLD_NEXT seems to work for existing functions");
      20        result = 0;
      21      }
      22    else
      23      {
      24        printf ("Heh?  `successful_rtld_next_test' returned %d\n", result);
      25        result = 1;
      26      }
      27  
      28    /* Next try a function which tries to get a function with RTLD_NEXT
      29       but that fails.  This dlsym() call should return a NULL pointer
      30       and do nothing else.  */
      31    addr = failing_rtld_next_use ();
      32    if (addr == NULL)
      33      puts ("dlsym returned NULL for non-existing function.  Good");
      34    else
      35      {
      36        puts ("dlsym found something !?");
      37        result = 1;
      38      }
      39  
      40    return result;
      41  }
      42  
      43  #include <support/test-driver.c>