elf/multiload.c

   1 #include <dlfcn.h>
   2 #include <errno.h>
   3 #include <mcheck.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <unistd.h>
   8
   9 int
  10 main (void)
  11 {
  12   void *a;
  13   void *b;
  14   void *c;
  15   void *d;
  16   char *wd;
  17   char *base;
  18   char *buf;
  19
  20   mtrace ();
  21
  22   /* Change to the binary directory.  */
  23   if (chdir (OBJDIR) != 0)
  24     {
  25       printf ("cannot change to `%s': %m", OBJDIR);
  26       exit (EXIT_FAILURE);
  27     }
  28
  29   wd = getcwd (NULL, 0);
  30   base = basename (wd);
  31   buf = alloca (strlen (wd) + strlen (base) + 5 + sizeof "testobj1.so");
  32
  33   printf ("loading `%s'\n", "./testobj1.so");
  34   a = dlopen ("./testobj1.so", RTLD_NOW);
  35   if (a == NULL)
  36     {
  37       printf ("cannot load `./testobj1.so': %s\n", dlerror ());
  38       exit (EXIT_FAILURE);
  39     }
  40
  41   stpcpy (stpcpy (stpcpy (buf, "../"), base), "/testobj1.so");
  42   printf ("loading `%s'\n", buf);
  43   b = dlopen (buf, RTLD_NOW);
  44   if (b == NULL)
  45     {
  46       printf ("cannot load `%s': %s\n", buf, dlerror ());
  47       exit (EXIT_FAILURE);
  48     }
  49
  50   stpcpy (stpcpy (buf, wd), "/testobj1.so");
  51   printf ("loading `%s'\n", buf);
  52   c = dlopen (buf, RTLD_NOW);
  53   if (c == NULL)
  54     {
  55       printf ("cannot load `%s': %s\n", buf, dlerror ());
  56       exit (EXIT_FAILURE);
  57     }
  58
  59   stpcpy (stpcpy (stpcpy (stpcpy (buf, wd), "/../"), base), "/testobj1.so");
  60   printf ("loading `%s'\n", buf);
  61   d = dlopen (buf, RTLD_NOW);
  62   if (d == NULL)
  63     {
  64       printf ("cannot load `%s': %s\n", buf, dlerror ());
  65       exit (EXIT_FAILURE);
  66     }
  67
  68   if (a != b || b != c || c != d)
  69     {
  70       puts ("shared object loaded more than once");
  71       exit (EXIT_FAILURE);
  72     }
  73
  74   if (dlclose (a) != 0)
  75     {
  76       puts ("closing `a' failed");
  77       exit (EXIT_FAILURE);
  78     }
  79   if (dlclose (b) != 0)
  80     {
  81       puts ("closing `a' failed");
  82       exit (EXIT_FAILURE);
  83     }
  84   if (dlclose (c) != 0)
  85     {
  86       puts ("closing `a' failed");
  87       exit (EXIT_FAILURE);
  88     }
  89   if (dlclose (d) != 0)
  90     {
  91       puts ("closing `a' failed");
  92       exit (EXIT_FAILURE);
  93     }
  94
  95   free (wd);
  96
  97   return 0;
  98 }
  99
 100 extern int foo (int a);
 101 int
 102 foo (int a)
 103 {
 104   return a;
 105 }