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: }