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glibc/elf/circleload1.c
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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; | |
} |