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glibc  2.9
Defines | Functions
circleload1.c File Reference
#include <dlfcn.h>
#include <libintl.h>
#include <link.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

Go to the source code of this file.

Defines

#define MAPS   ((struct link_map *) _r_debug.r_map)

Functions

static int check_loaded_objects (const char **loaded)
static int load_dso (const char **loading, int undef, int flag)
int main (void)

Define Documentation

#define MAPS   ((struct link_map *) _r_debug.r_map)

Definition at line 8 of file circleload1.c.


Function Documentation

static int check_loaded_objects ( const char **  loaded) [static]

Definition at line 11 of file circleload1.c.

{
  struct link_map *lm;
  int n;
  int *found = NULL;
  int errors = 0;

  for (n = 0; loaded[n]; n++)
    /* NOTHING */;

  if (n)
    {
      found = (int *) alloca (sizeof (int) * n);
      memset (found, 0, sizeof (int) * n);
    }

  printf("   Name\n");
  printf(" --------------------------------------------------------\n");
  for (lm = MAPS; lm; lm = lm->l_next)
    {
      if (lm->l_name && lm->l_name[0])
       printf(" %s, count = %d\n", lm->l_name, (int) lm->l_direct_opencount);
      if (lm->l_type == lt_loaded && lm->l_name)
       {
         int match = 0;
         for (n = 0; loaded[n] != NULL; n++)
           {
             if (strcmp (basename (loaded[n]), basename (lm->l_name)) == 0)
               {
                found[n] = 1;
                match = 1;
                break;
              }
           }

         if (match == 0)
           {
             ++errors;
             printf ("ERRORS: %s is not unloaded\n", lm->l_name);
           }
       }
    }

  for (n = 0; loaded[n] != NULL; n++)
    {
      if (found[n] == 0)
        {
         ++errors;
         printf ("ERRORS: %s is not loaded\n", loaded[n]);
       }
    }

  return errors;
}

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static int load_dso ( const char **  loading,
int  undef,
int  flag 
) [static]

Definition at line 67 of file circleload1.c.

{
  void *obj;
  const char *loaded[] = { NULL, NULL, NULL, NULL };
  int errors = 0;
  const char *errstring;

  printf ("\nThis is what is in memory now:\n");
  errors += check_loaded_objects (loaded);

  printf ("Loading shared object %s: %s\n", loading[0],
        flag == RTLD_LAZY ? "RTLD_LAZY" : "RTLD_NOW");
  obj = dlopen (loading[0], flag);
  if (obj == NULL)
    {
      if (flag == RTLD_LAZY)
       {
         ++errors;
         printf ("ERRORS: dlopen shouldn't fail for RTLD_LAZY\n");
       }

      errstring = dlerror ();
      if (strstr (errstring, "undefined symbol") == 0
         || strstr (errstring, "circlemod2_undefined") == 0)
       {
         ++errors;
         printf ("ERRORS: dlopen: `%s': Invalid error string\n",
                errstring);
       }
      else
       printf ("dlopen: %s\n", errstring);
    }
  else
    {
      if (undef && flag == RTLD_NOW)
       {
         ++errors;
         printf ("ERRORS: dlopen shouldn't work for RTLD_NOW\n");
       }

      if (!undef)
       {
         int (*func) (void);

         func = dlsym (obj, "circlemod1");
         if (func == NULL)
           {
             ++errors;
             printf ("ERRORS: cannot get address of \"circlemod1\": %s\n",
                    dlerror ());
           }
         else if (func () != 3)
           {
             ++errors;
             printf ("ERRORS: function \"circlemod1\" returned wrong result\n");
           }
       }

      loaded[0] = loading[0];
      loaded[1] = loading[1];
      loaded[2] = loading[2];
    }
  errors += check_loaded_objects (loaded);

  if (obj)
    {
      printf ("UnLoading shared object %s\n", loading[0]);
      dlclose (obj);
      loaded[0] = NULL;
      loaded[1] = NULL;
      loaded[2] = NULL;
      errors += check_loaded_objects (loaded);
    }

  return errors;
}

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int main ( void  )

Definition at line 145 of file circleload1.c.

{
  int errors = 0;
  const char *loading[3];

  loading[0] = "circlemod1a.so";
  loading[1] = "circlemod2a.so";
  loading[2] = "circlemod3a.so";
  errors += load_dso (loading, 0, RTLD_LAZY);
  errors += load_dso (loading, 0, RTLD_NOW);

  loading[0] = "circlemod1.so";
  loading[1] = "circlemod2.so";
  loading[2] = "circlemod3.so";
  errors += load_dso (loading, 1, RTLD_LAZY);
  errors += load_dso (loading, 1, RTLD_NOW);

  if (errors != 0)
    printf ("%d errors found\n", errors);

  return errors;
}

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