/* We run this if we debug the memory allocation. */
static void __libc_freeres_fn_section
do_release_all (void *nodep)
{
struct __gconv_loaded_object *obj = (struct __gconv_loaded_object *) nodep;
/* Unload the shared object. */
if (obj->handle != NULL)
__libc_dlclose (obj->handle);
free (obj);
}
void
__libc_freeres_fn_section
__unwind_freeres (void)
{
void *handle = libgcc_s_handle;
if (handle != NULL)
{
libgcc_s_handle = NULL;
__libc_dlclose (handle);
}
}
int main(int argc, char **argv) {
void *handle;
double (*puts)(char *);
char *error;
handle = __libc_dlopen_mode("libc.so.6", RTLD_LAZY);
if (!handle) {
exit(1);
}
puts = __libc_dlsym(handle, "puts");
(*puts)("Hello World");
__libc_dlclose(handle);
}
free_mem (void)
{
name_database *top = service_table;
name_database_entry *entry;
service_library *library;
if (top == NULL)
/* Maybe we have not read the nsswitch.conf file. */
return;
/* Don't disturb ongoing other threads (if there are any). */
service_table = NULL;
entry = top->entry;
while (entry != NULL)
{
name_database_entry *olde = entry;
service_user *service = entry->service;
while (service != NULL)
{
service_user *olds = service;
if (service->known != NULL)
__tdestroy (service->known, free);
service = service->next;
free (olds);
}
entry = entry->next;
free (olde);
}
library = top->library;
while (library != NULL)
{
service_library *oldl = library;
__libc_dlclose (library->lib_handle);
library = library->next;
free (oldl);
}
free (top);
}
static void
init (void)
{
libgcc_handle = __libc_dlopen ("libgcc_s.so.2");
if (libgcc_handle == NULL)
return;
unwind_backtrace = __libc_dlsym (libgcc_handle, "_Unwind_Backtrace");
unwind_getip = __libc_dlsym (libgcc_handle, "_Unwind_GetIP");
unwind_getcfa = __libc_dlsym (libgcc_handle, "_Unwind_GetCFA");
unwind_getgr = __libc_dlsym (libgcc_handle, "_Unwind_GetGR");
if (unwind_getip == NULL || unwind_getgr == NULL || unwind_getcfa == NULL)
{
unwind_backtrace = NULL;
__libc_dlclose (libgcc_handle);
libgcc_handle = NULL;
}
}
static void
do_release_shlib (void *nodep, VISIT value, int level)
{
struct __gconv_loaded_object *obj = *(struct __gconv_loaded_object **) nodep;
if (value != preorder && value != leaf)
return;
if (obj == release_handle)
{
/* This is the object we want to unload. Now decrement the
reference counter. */
assert (obj->counter > 0);
--obj->counter;
}
else if (obj->counter <= 0 && obj->counter >= -TRIES_BEFORE_UNLOAD
&& --obj->counter < -TRIES_BEFORE_UNLOAD && obj->handle != NULL)
{
/* Unload the shared object. */
__libc_dlclose (obj->handle);
obj->handle = NULL;
}
}
void * threadfunc (void * arg)
{
printf ("in threadfunc\n");
void * handle = __libc_dlopen_mode ("./test_unload.so", RTLD_LAZY | 0x80000000);
printf ("dlopen ok handle: %p\n", handle);
void (*pfn_shared_method)(void) = __libc_dlsym(handle, "shared_method");
printf ("before func\n");
pfn_shared_method ();
printf ("after func\n");
printf ("about to dlclose handle: %p\n", handle);
__libc_dlclose (handle);
printf ("done dlclose\n");
while (!stopping)
sleep (1);
printf ("leaving threadfunc\n");
stopped = 1;
}