int
do_test (void)
{
void *handle;
int (*sym) (void); /* We load ref1 from glreflib1.c. */
Dl_info info;
int ret;
handle = dlopen ("glreflib1.so", RTLD_NOW);
if (handle == NULL)
error (EXIT_FAILURE, 0, "cannot load: glreflib1.so");
sym = dlsym (handle, "ref1");
if (sym == NULL)
error (EXIT_FAILURE, 0, "dlsym failed");
memset (&info, 0, sizeof (info));
ret = dladdr (sym, &info);
if (ret == 0)
error (EXIT_FAILURE, 0, "dladdr failed");
printf ("address of ref1 = %lx\n",
(unsigned long int) DL_LOOKUP_ADDRESS (sym));
printf ("ret = %d\n", ret);
printf ("info.dli_fname = %p (\"%s\")\n", info.dli_fname, info.dli_fname);
printf ("info.dli_fbase = %p\n", info.dli_fbase);
printf ("info.dli_sname = %p (\"%s\")\n", info.dli_sname, info.dli_sname);
printf ("info.dli_saddr = %p\n", info.dli_saddr);
if (info.dli_fname == NULL)
error (EXIT_FAILURE, 0, "dli_fname is NULL");
if (info.dli_fbase == NULL)
error (EXIT_FAILURE, 0, "dli_fbase is NULL");
if (info.dli_sname == NULL)
error (EXIT_FAILURE, 0, "dli_sname is NULL");
if (info.dli_saddr == NULL)
error (EXIT_FAILURE, 0, "dli_saddr is NULL");
dlclose (handle);
return 0;
}
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <dlfcn.h>
#include <stddef.h>
#include <ldsodefs.h>
int
internal_function
_dl_addr (const void *address, Dl_info *info,
struct link_map **mapp, const ElfW(Sym) **symbolp)
{
const ElfW(Addr) addr = DL_LOOKUP_ADDRESS (address);
struct link_map *match;
const ElfW(Sym) *symtab, *matchsym, *symtabend;
const char *strtab;
ElfW(Word) strtabsize;
/* Protect against concurrent loads and unloads. */
__rtld_lock_lock_recursive (GL(dl_load_lock));
/* Find the highest-addressed object that ADDRESS is not below. */
match = NULL;
for (Lmid_t ns = 0; ns < DL_NNS; ++ns)
for (struct link_map *l = GL(dl_ns)[ns]._ns_loaded; l; l = l->l_next)
if (addr >= l->l_map_start && addr < l->l_map_end)
{
/* We know ADDRESS lies within L if in any shared object.