elf/neededtest4.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 #define MAPS ((struct link_map *) _r_debug.r_map)
   9
  10 static int
  11 check_loaded_objects (const char **loaded)
  12 {
  13   struct link_map *lm;
  14   int n;
  15   int *found = NULL;
  16   int errors = 0;
  17
  18   for (n = 0; loaded[n]; n++)
  19     /* NOTHING */;
  20
  21   if (n)
  22     {
  23       found = (int *) alloca (sizeof (int) * n);
  24       memset (found, 0, sizeof (int) * n);
  25     }
  26
  27   printf("   Name\n");
  28   printf(" --------------------------------------------------------\n");
  29   for (lm = MAPS; lm; lm = lm->l_next)
  30     {
  31       if (lm->l_name && lm->l_name[0])
  32         printf(" %s, count = %d\n", lm->l_name, (int) lm->l_direct_opencount);
  33       if (lm->l_type == lt_loaded && lm->l_name)
  34         {
  35           int match = 0;
  36           for (n = 0; loaded[n] != NULL; n++)
  37             {
  38               if (strcmp (basename (loaded[n]), basename (lm->l_name)) == 0)
  39                 {
  40                   found[n] = 1;
  41                   match = 1;
  42                   break;
  43                 }
  44             }
  45
  46           if (match == 0)
  47             {
  48               ++errors;
  49               printf ("ERRORS: %s is not unloaded\n", lm->l_name);
  50             }
  51         }
  52     }
  53
  54   for (n = 0; loaded[n] != NULL; n++)
  55     {
  56       if (found[n] == 0)
  57         {
  58           ++errors;
  59           printf ("ERRORS: %s is not loaded\n", loaded[n]);
  60         }
  61     }
  62
  63   return errors;
  64 }
  65
  66 extern void c_function (void);
  67 extern char *dirname (const char *__filename);
  68
  69 int
  70 main (int argc, char **argv)
  71 {
  72   void *obj;
  73   const char *loaded[] = { NULL, NULL, NULL};
  74   int errors = 0;
  75   void (*f) (void);
  76   const char *dir = dirname (argv [0]);
  77   char *oldfilename;
  78   char *newfilename;
  79
  80   c_function ();
  81
  82   printf ("\nThis is what is in memory now:\n");
  83   errors += check_loaded_objects (loaded);
  84
  85   printf( "Loading shared object neededobj6.so\n");
  86   obj = dlopen( "neededobj6.so", RTLD_LAZY);
  87   if (obj == NULL)
  88     {
  89       printf ("%s\n", dlerror ());
  90       exit (1);
  91     }
  92   f = dlsym (obj, "a2_function");
  93   if (f == NULL)
  94     {
  95       printf ("%s\n", dlerror ());
  96       exit (1);
  97     }
  98   f ();
  99   loaded[0] = "neededobj5.so";
 100   loaded[1] = "neededobj6.so";
 101   errors += check_loaded_objects (loaded);
 102
 103   printf ("Closing neededobj6.so\n");
 104   dlclose (obj);
 105   loaded[0] = NULL;
 106   errors += check_loaded_objects (loaded);
 107
 108   printf ("Rename neededobj5.so\n");
 109   oldfilename = alloca (strlen (dir) + 1 + sizeof ("neededobj5.so"));
 110   strcpy (oldfilename, dir);
 111   strcat (oldfilename, "/");
 112   strcat (oldfilename, "neededobj5.so");
 113   newfilename = alloca (strlen (oldfilename) + sizeof (".renamed"));
 114   strcpy (newfilename, oldfilename);
 115   strcat (newfilename, ".renamed");
 116   if (rename (oldfilename, newfilename))
 117     {
 118       perror ("rename");
 119       exit (1);
 120     }
 121
 122   printf( "Loading shared object neededobj6.so\n");
 123   obj = dlopen( "neededobj6.so", RTLD_LAZY);
 124   if (obj == NULL)
 125     printf ("%s\n", dlerror ());
 126   else
 127     {
 128       printf ("neededobj6.so should fail to load\n");
 129       exit (1);
 130     }
 131
 132   printf( "Loading shared object neededobj1.so\n");
 133   obj = dlopen( "neededobj1.so", RTLD_LAZY);
 134   if (obj == NULL)
 135     {
 136       printf ("%s\n", dlerror ());
 137       exit (1);
 138     }
 139   errors += check_loaded_objects (loaded);
 140   f = dlsym (obj, "c_function");
 141   if (f == NULL)
 142     {
 143       printf ("%s\n", dlerror ());
 144       exit (1);
 145     }
 146   f ();
 147
 148   printf ("Restore neededobj5.so\n");
 149   if (rename (newfilename, oldfilename))
 150     {
 151       perror ("rename");
 152       exit (1);
 153     }
 154
 155   if (errors != 0)
 156     printf ("%d errors found\n", errors);
 157   return errors;
 158 }