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d72c276305
The tst-tls-atexit test case searches for its module in /proc/PID/maps to verify that it is unloaded, which is a Linux-specific test. This patch makes the test generic by looking for the library in the link map list in the _r_debug structure. Verified that the test continues to succeed on x86_64. There is a bug in the test case where it calls dlclose once again, which is actually incorrect but still manages to unload the DSO thanks to an existing bug in __tls_call_dtors. This will be fixed in a later patch which also fixes up the __cxa_thread_atexit_impl implementation. I have added a FIXME comment to that call momentarily, which I will remove when I fix the problem. * stdlib/tst-tls-atexit-lib.c (do_foo): Rename to reg_dtor. * stdlib/tst-tls-atexit.c: (is_loaded): New function. (spawn_thread): New function. (load): Rename to reg_dtor_and_close. Move dlopen to... (do_test): ... here. Use IS_LOADED to test for its availability.
124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
/* Verify that DSO is unloaded only if its TLS objects are destroyed.
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Copyright (C) 2013-2015 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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<http://www.gnu.org/licenses/>. */
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/* This test dynamically loads a DSO and spawns a thread that subsequently
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calls into the DSO to register a destructor for an object in the DSO and
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then calls dlclose on the handle for the DSO. When the thread exits, the
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DSO should not be unloaded or else the destructor called during thread exit
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will crash. Further in the main thread, the DSO is opened and closed again,
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at which point the DSO should be unloaded. */
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#include <dlfcn.h>
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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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#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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return true;
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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)) dlsym (h, "reg_dtor");
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if (reg_dtor == NULL)
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{
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printf ("Unable to find symbol: %s\n", dlerror ());
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return (void *) (uintptr_t) 1;
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}
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reg_dtor ();
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dlclose (h);
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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 = dlopen (DSO_NAME, RTLD_LAZY);
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if (h1 == NULL)
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{
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printf ("h1: Unable to load DSO: %s\n", dlerror ());
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return 1;
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}
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if (spawn_thread (h1) != 0)
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return 1;
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/* Now this should unload the DSO. FIXME: This is a bug, calling dlclose
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like this is actually wrong, but it works because cxa_thread_atexit_impl
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has a bug which results in dlclose allowing this to work. */
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dlclose (h1);
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/* Check link maps to ensure that the DSO has unloaded. */
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if (is_loaded ())
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return 1;
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return 0;
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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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