dlfcn/failtest.c

   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 }