elf/neededtest.c

   1 #include <dlfcn.h>
   2 #include <libintl.h>
   3 #include <link.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7
   8 static int
   9 check_loaded_objects (const char **loaded)
  10 {
  11   struct link_map *lm;
  12   int n;
  13   int *found = NULL;
  14   int errors = 0;
  15
  16   for (n = 0; loaded[n]; n++)
  17     /* NOTHING */;
  18
  19   if (n)
  20     {
  21       found = (int *) alloca (sizeof (int) * n);
  22       memset (found, 0, sizeof (int) * n);
  23     }
  24
  25   printf("   Name\n");
  26   printf(" --------------------------------------------------------\n");
  27   for (lm = _r_debug.r_map; lm; lm = lm->l_next)
  28     {
  29       if (lm->l_name && lm->l_name[0])
  30         printf(" %s, count = %d\n", lm->l_name, (int) lm->l_direct_opencount);
  31       if (lm->l_type == lt_loaded && lm->l_name)
  32         {
  33           int match = 0;
  34           for (n = 0; loaded[n] != NULL; n++)
  35             {
  36               if (strcmp (basename (loaded[n]), basename (lm->l_name)) == 0)
  37                 {
  38                   found[n] = 1;
  39                   match = 1;
  40                   break;
  41                 }
  42             }
  43
  44           if (match == 0)
  45             {
  46               ++errors;
  47               printf ("ERRORS: %s is not unloaded\n", lm->l_name);
  48             }
  49         }
  50     }
  51
  52   for (n = 0; loaded[n] != NULL; n++)
  53     {
  54       if (found[n] == 0)
  55         {
  56           ++errors;
  57           printf ("ERRORS: %s is not loaded\n", loaded[n]);
  58         }
  59     }
  60
  61   return errors;
  62 }
  63
  64 int
  65 main (void)
  66 {
  67   void *obj2[2];
  68   void *obj3;
  69   const char *loaded[] = { NULL, NULL, NULL, NULL };
  70   int errors = 0;
  71
  72   printf ("\nThis is what is in memory now:\n");
  73   errors += check_loaded_objects (loaded);
  74
  75   printf( "Loading shared object neededobj3.so\n");
  76   obj3 = dlopen( "neededobj3.so", RTLD_LAZY);
  77   if (obj3 == NULL)
  78     {
  79       printf ("%s\n", dlerror ());
  80       exit (1);
  81     }
  82   loaded[0] = "neededobj1.so";
  83   loaded[1] = "neededobj2.so";
  84   loaded[2] = "neededobj3.so";
  85   errors += check_loaded_objects (loaded);
  86
  87   printf ("Now loading shared object neededobj2.so\n");
  88   obj2[0] = dlopen ("neededobj2.so", RTLD_LAZY);
  89   if (obj2[0] == NULL)
  90     {
  91       printf ("%s\n", dlerror ());
  92       exit (1);
  93     }
  94   errors += check_loaded_objects (loaded);
  95
  96   printf ("And loading shared object neededobj2.so again\n");
  97   obj2[1] = dlopen ("neededobj2.so", RTLD_LAZY);
  98   if (obj2[1] == NULL)
  99     {
 100       printf ("%s\n", dlerror ());
 101       exit (1);
 102     }
 103   errors += check_loaded_objects (loaded);
 104
 105   printf ("Closing neededobj2.so for the first time\n");
 106   dlclose (obj2[0]);
 107   errors += check_loaded_objects (loaded);
 108
 109   printf ("Closing neededobj3.so\n");
 110   dlclose (obj3);
 111   loaded[2] = NULL;
 112   errors += check_loaded_objects (loaded);
 113
 114   printf ("Closing neededobj2.so for the second time\n");
 115   dlclose (obj2[1]);
 116   loaded[0] = NULL;
 117   loaded[1] = NULL;
 118   errors += check_loaded_objects (loaded);
 119
 120   if (errors != 0)
 121     printf ("%d errors found\n", errors);
 122   return errors;
 123 }