elf/loadtest.c

   1 #include <assert.h>
   2 #include <dlfcn.h>
   3 #include <errno.h>
   4 #include <error.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7
   8
   9 /* How many load/unload operations do we do.  */
  10 #define TEST_ROUNDS     100
  11
  12
  13 static struct
  14 {
  15   /* Name of the module.  */
  16   const char *name;
  17   /* The handle.  */
  18   void *handle;
  19 } testobjs[] =
  20 {
  21   { "testobj1.so", NULL },
  22   { "testobj2.so", NULL },
  23   { "testobj3.so", NULL },
  24 };
  25 #define NOBJS   (sizeof (testobjs) / sizeof (testobjs[0]))
  26
  27
  28 static const struct
  29 {
  30   /* Name of a function to call.  */
  31   const char *fname;
  32   /* Index in status and handle array.  */
  33   int index;
  34   /* Options while loading the module.  */
  35   int options;
  36 } tests[] =
  37 {
  38   { "obj1func2", 0, RTLD_LAZY },
  39   { "obj1func1", 0, RTLD_LAZY | RTLD_GLOBAL },
  40   { "obj1func1", 0, RTLD_NOW, },
  41   { "obj1func2", 0, RTLD_NOW | RTLD_GLOBAL },
  42   { "obj2func2", 1, RTLD_LAZY },
  43   { "obj2func1", 1, RTLD_LAZY | RTLD_GLOBAL, },
  44   { "obj2func1", 1, RTLD_NOW, },
  45   { "obj2func2", 1, RTLD_NOW | RTLD_GLOBAL },
  46   { "obj3func2", 2, RTLD_LAZY },
  47   { "obj3func1", 2, RTLD_LAZY | RTLD_GLOBAL },
  48   { "obj3func1", 2, RTLD_NOW },
  49   { "obj3func2", 2, RTLD_NOW | RTLD_GLOBAL },
  50 };
  51 #define NTESTS  (sizeof (tests) / sizeof (tests[0]))
  52
  53
  54 int
  55 main (void)
  56 {
  57   int count = TEST_ROUNDS;
  58
  59   /* Just a seed.  */
  60   srandom (TEST_ROUNDS);
  61
  62   while (count--)
  63     {
  64       int nr = random () % NTESTS;
  65       int index = tests[nr].index;
  66
  67       printf ("%4d: %4d: ", count + 1, nr);
  68       fflush (stdout);
  69
  70       if (testobjs[index].handle == NULL)
  71         {
  72           int (*fct) (int);
  73
  74           /* Load the object.  */
  75           testobjs[index].handle = dlopen (testobjs[index].name,
  76                                            tests[nr].options);
  77           if (testobjs[index].handle == NULL)
  78             error (EXIT_FAILURE, 0, "cannot load `%s': %s",
  79                    testobjs[index].name, dlerror ());
  80
  81           /* Test the function call.  */
  82           fct = dlsym (testobjs[index].handle, tests[nr].fname);
  83           if (fct == NULL)
  84             error (EXIT_FAILURE, 0,
  85                    "cannot get function `%s' from shared object `%s': %s",
  86                    tests[nr].fname, testobjs[index].name, dlerror ());
  87
  88           fct (10);
  89
  90           printf ("successfully loaded `%s'\n", testobjs[index].name);
  91         }
  92       else
  93         {
  94           dlclose (testobjs[index].handle);
  95           testobjs[index].handle = NULL;
  96
  97           printf ("successfully unloaded `%s'\n", testobjs[index].name);
  98         }
  99     }
 100
 101   /* Unload all loaded modules.  */
 102   for (count = 0; count < NOBJS; ++count)
 103     if (testobjs[count].handle != NULL)
 104       dlclose (testobjs[count].handle);
 105
 106   return 0;
 107 }
 108
 109
 110 int
 111 foo (int a)
 112 {
 113   return a - 1;
 114 }