mirror of git://sourceware.org/git/glibc.git
141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/* Verify that DSO is unloaded only if its TLS objects are destroyed.
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Copyright (C) 2013-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* For the default case, i.e. NO_DELETE not defined, the test dynamically loads
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a DSO and spawns a thread that subsequently calls into the DSO to register a
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destructor for an object in the DSO and then calls dlclose on the handle for
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the DSO. When the thread exits, the DSO should not be unloaded or else the
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destructor called during thread exit will crash. Further in the main
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thread, the DSO is opened and closed again, at which point the DSO should be
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unloaded.
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When NO_DELETE is defined, the DSO is loaded twice, once with just RTLD_LAZY
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flag and the second time with the RTLD_NODELETE flag set. The thread is
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spawned, destructor registered and then thread exits without closing the
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DSO. In the main thread, the first handle is then closed, followed by the
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second handle. In the end, the DSO should remain loaded due to the
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RTLD_NODELETE flag being set in the second dlopen call. */
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#include <pthread.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <link.h>
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#include <stdbool.h>
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#include <support/xdlfcn.h>
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#ifndef NO_DELETE
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# define LOADED_IS_GOOD false
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#endif
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#ifndef H2_RTLD_FLAGS
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# define H2_RTLD_FLAGS (RTLD_LAZY)
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#endif
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#define DSO_NAME "$ORIGIN/tst-tls-atexit-lib.so"
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/* Walk through the map in the _r_debug structure to see if our lib is still
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loaded. */
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static bool
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is_loaded (void)
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{
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struct link_map *lm = (struct link_map *) _r_debug.r_map;
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for (; lm; lm = lm->l_next)
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if (lm->l_type == lt_loaded && lm->l_name
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&& strcmp (basename (DSO_NAME), basename (lm->l_name)) == 0)
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{
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printf ("%s is still loaded\n", lm->l_name);
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return true;
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}
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return false;
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}
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/* Accept a valid handle returned by DLOPEN, load the reg_dtor symbol to
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register a destructor and then call dlclose on the handle. The dlclose
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should not unload the DSO since the destructor has not been called yet. */
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static void *
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reg_dtor_and_close (void *h)
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{
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void (*reg_dtor) (void) = (void (*) (void)) xdlsym (h, "reg_dtor");
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reg_dtor ();
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#ifndef NO_DELETE
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xdlclose (h);
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#endif
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return NULL;
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}
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static int
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spawn_thread (void *h)
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{
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pthread_t t;
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int ret;
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void *thr_ret;
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if ((ret = pthread_create (&t, NULL, reg_dtor_and_close, h)) != 0)
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{
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printf ("pthread_create failed: %s\n", strerror (ret));
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return 1;
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}
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if ((ret = pthread_join (t, &thr_ret)) != 0)
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{
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printf ("pthread_join failed: %s\n", strerror (ret));
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return 1;
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}
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if (thr_ret != NULL)
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return 1;
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return 0;
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}
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static int
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do_test (void)
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{
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/* Load the DSO. */
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void *h1 = xdlopen (DSO_NAME, RTLD_LAZY);
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#ifndef NO_DELETE
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if (spawn_thread (h1) != 0)
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return 1;
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#endif
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void *h2 = xdlopen (DSO_NAME, H2_RTLD_FLAGS);
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#ifdef NO_DELETE
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if (spawn_thread (h1) != 0)
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return 1;
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xdlclose (h1);
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#endif
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xdlclose (h2);
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/* Check link maps to ensure that the DSO has unloaded. In the normal case,
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the DSO should be unloaded if there are no uses. However, if one of the
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dlopen calls were with RTLD_NODELETE, the DSO should remain loaded. */
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return is_loaded () == LOADED_IS_GOOD ? 0 : 1;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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