1  #include <dlfcn.h>
       2  #include <stdio.h>
       3  
       4  
       5  /* Number of rounds we perform the test.  */
       6  #define TEST_ROUNDS	10
       7  
       8  
       9  static const char unknown[] = "a-file-with-this-name-does-not-exist";
      10  static const char exists[] = "failtestmod.so";
      11  
      12  
      13  int
      14  main (void)
      15  {
      16    int i;
      17  
      18    setvbuf (stdout, NULL, _IONBF, 0);
      19  
      20    for (i = 0; i < TEST_ROUNDS; ++i)
      21      {
      22        void *dsc;
      23  
      24        printf ("Round %d: Try loading \"%s\"\n", i, unknown);
      25  
      26        dsc = dlopen (unknown, RTLD_NOW);
      27        if (dsc != NULL)
      28  	{
      29  	  printf ("We found a file of name \"%s\": this should not happen\n",
      30  		  unknown);
      31  	  return 1;
      32  	}
      33  
      34        printf ("Round %d: loading \"%s\" failed\n", i, unknown);
      35  
      36        /* Don't use `dlerror', just load an existing file.  */
      37        dsc = dlopen (exists, RTLD_NOW);
      38        if (dsc == NULL)
      39  	{
      40  	  printf ("Could not load \"%s\": %s\n", exists, dlerror ());
      41  	  return 1;
      42  	}
      43  
      44        printf ("Round %d: Loaded \"%s\"\n", i, exists);
      45  
      46        dlclose (dsc);
      47  
      48        printf ("Round %d: Unloaded \"%s\"\n", i, exists);
      49      }
      50  
      51    return 0;
      52  }
      53  
      54  
      55  extern void foo (void);
      56  
      57  void
      58  foo (void)
      59  {
      60  }