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#include <dlfcn.h>
#include <libintl.h>
#include <link.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAPS ((struct link_map *) _r_debug.r_map)
static int
check_loaded_objects (const char **loaded)
{
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;
}
static int
load_dso (const char **loading, int undef, int flag)
{
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;
}
int
main (void)
{
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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