elf/reldep5.c

   1 #include <dlfcn.h>
   2 #include <mcheck.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5
   6 int
   7 main (void)
   8 {
   9   void *h1;
  10   void *h2;
  11   int (*fp) (void);
  12
  13   mtrace ();
  14
  15   /* Open the two objects.  */
  16   h1 = dlopen ("reldepmod5.so", RTLD_LAZY);
  17   if (h1 == NULL)
  18     {
  19       printf ("cannot open reldepmod5.so: %s\n", dlerror ());
  20       exit (1);
  21     }
  22   h2 = dlopen ("reldepmod6.so", RTLD_LAZY);
  23   if (h2 == NULL)
  24     {
  25       printf ("cannot open reldepmod6.so: %s\n", dlerror ());
  26       exit (1);
  27     }
  28
  29   /* Get the address of the variable in reldepmod1.so.  */
  30   fp = dlsym (h2, "bar");
  31   if (fp == NULL)
  32     {
  33       printf ("cannot get address of \"bar\": %s\n", dlerror ());
  34       exit (1);
  35     }
  36
  37   /* Call the function.  */
  38   puts ("calling fp for the first time");
  39   if (fp () != 0)
  40     {
  41       puts ("function \"call_me\" returned wrong result");
  42       exit (1);
  43     }
  44
  45   /* Now close the first object.  It must still be around since we have
  46      an implicit dependency.  */
  47   if (dlclose (h1) != 0)
  48     {
  49       printf ("closing h1 failed: %s\n", dlerror ());
  50       exit (1);
  51     }
  52
  53   /* Calling the function must still work.  */
  54   puts ("calling fp for the second time");
  55   if (fp () != 0)
  56     {
  57       puts ("function \"call_me\" the second time returned wrong result");
  58       exit (1);
  59     }
  60   puts ("second call succeeded as well");
  61
  62   /* Close the second object, we are done.  */
  63   if (dlclose (h2) != 0)
  64     {
  65       printf ("closing h2 failed: %s\n", dlerror ());
  66       exit (1);
  67     }
  68
  69   return 0;
  70 }