mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-08 22:30:07 +00:00
688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/* Verify that DSO is unloaded only if its TLS objects are destroyed.
|
|
Copyright (C) 2013-2018 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/* For the default case, i.e. NO_DELETE not defined, the test dynamically loads
|
|
a DSO and spawns a thread that subsequently calls into the DSO to register a
|
|
destructor for an object in the DSO and then calls dlclose on the handle for
|
|
the DSO. When the thread exits, the DSO should not be unloaded or else the
|
|
destructor called during thread exit will crash. Further in the main
|
|
thread, the DSO is opened and closed again, at which point the DSO should be
|
|
unloaded.
|
|
|
|
When NO_DELETE is defined, the DSO is loaded twice, once with just RTLD_LAZY
|
|
flag and the second time with the RTLD_NODELETE flag set. The thread is
|
|
spawned, destructor registered and then thread exits without closing the
|
|
DSO. In the main thread, the first handle is then closed, followed by the
|
|
second handle. In the end, the DSO should remain loaded due to the
|
|
RTLD_NODELETE flag being set in the second dlopen call. */
|
|
|
|
#include <pthread.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <link.h>
|
|
#include <stdbool.h>
|
|
#include <support/xdlfcn.h>
|
|
|
|
#ifndef NO_DELETE
|
|
# define LOADED_IS_GOOD false
|
|
#endif
|
|
|
|
#ifndef H2_RTLD_FLAGS
|
|
# define H2_RTLD_FLAGS (RTLD_LAZY)
|
|
#endif
|
|
|
|
#define DSO_NAME "$ORIGIN/tst-tls-atexit-lib.so"
|
|
|
|
/* Walk through the map in the _r_debug structure to see if our lib is still
|
|
loaded. */
|
|
static bool
|
|
is_loaded (void)
|
|
{
|
|
struct link_map *lm = (struct link_map *) _r_debug.r_map;
|
|
|
|
for (; lm; lm = lm->l_next)
|
|
if (lm->l_type == lt_loaded && lm->l_name
|
|
&& strcmp (basename (DSO_NAME), basename (lm->l_name)) == 0)
|
|
{
|
|
printf ("%s is still loaded\n", lm->l_name);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* Accept a valid handle returned by DLOPEN, load the reg_dtor symbol to
|
|
register a destructor and then call dlclose on the handle. The dlclose
|
|
should not unload the DSO since the destructor has not been called yet. */
|
|
static void *
|
|
reg_dtor_and_close (void *h)
|
|
{
|
|
void (*reg_dtor) (void) = (void (*) (void)) xdlsym (h, "reg_dtor");
|
|
|
|
reg_dtor ();
|
|
|
|
#ifndef NO_DELETE
|
|
xdlclose (h);
|
|
#endif
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
spawn_thread (void *h)
|
|
{
|
|
pthread_t t;
|
|
int ret;
|
|
void *thr_ret;
|
|
|
|
if ((ret = pthread_create (&t, NULL, reg_dtor_and_close, h)) != 0)
|
|
{
|
|
printf ("pthread_create failed: %s\n", strerror (ret));
|
|
return 1;
|
|
}
|
|
|
|
if ((ret = pthread_join (t, &thr_ret)) != 0)
|
|
{
|
|
printf ("pthread_join failed: %s\n", strerror (ret));
|
|
return 1;
|
|
}
|
|
|
|
if (thr_ret != NULL)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
/* Load the DSO. */
|
|
void *h1 = xdlopen (DSO_NAME, RTLD_LAZY);
|
|
|
|
#ifndef NO_DELETE
|
|
if (spawn_thread (h1) != 0)
|
|
return 1;
|
|
#endif
|
|
|
|
void *h2 = xdlopen (DSO_NAME, H2_RTLD_FLAGS);
|
|
|
|
#ifdef NO_DELETE
|
|
if (spawn_thread (h1) != 0)
|
|
return 1;
|
|
|
|
xdlclose (h1);
|
|
#endif
|
|
xdlclose (h2);
|
|
|
|
/* Check link maps to ensure that the DSO has unloaded. In the normal case,
|
|
the DSO should be unloaded if there are no uses. However, if one of the
|
|
dlopen calls were with RTLD_NODELETE, the DSO should remain loaded. */
|
|
return is_loaded () == LOADED_IS_GOOD ? 0 : 1;
|
|
}
|
|
|
|
#define TEST_FUNCTION do_test ()
|
|
#include "../test-skeleton.c"
|