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112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
/* Verify that DSO is unloaded only if its TLS objects are destroyed.
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Copyright (C) 2013 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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/* There are two tests in this test case. The first is implicit where it is
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assumed that the destructor call on exit of the LOAD function does not
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segfault. The other is a verification that after the thread has exited, a
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dlclose will unload the DSO. */
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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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void *handle;
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pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
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void *
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load (void *u)
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{
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pthread_mutex_lock (&m);
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handle = dlopen ("$ORIGIN/tst-tls-atexit-lib.so", RTLD_LAZY);
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if (!handle)
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{
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printf ("Unable to load DSO: %s\n", dlerror ());
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return (void *) (uintptr_t) 1;
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}
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void (*foo) (void) = (void (*) (void)) dlsym(handle, "do_foo");
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if (!foo)
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{
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printf ("Unable to find symbol: %s\n", dlerror ());
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exit (1);
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}
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foo ();
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/* This should not unload the DSO. If it does, then the thread exit will
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result in a segfault. */
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dlclose (handle);
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pthread_mutex_unlock (&m);
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return NULL;
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}
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int
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main (void)
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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, load, NULL)) != 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_create 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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/* Now this should unload the DSO. */
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dlclose (handle);
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/* Run through our maps and ensure that the DSO is unloaded. */
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FILE *f = fopen ("/proc/self/maps", "r");
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if (f == NULL)
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{
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perror ("Failed to open /proc/self/maps");
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fprintf (stderr, "Skipping verification of DSO unload\n");
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return 0;
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}
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char *line = NULL;
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size_t s = 0;
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while (getline (&line, &s, f) > 0)
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{
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if (strstr (line, "tst-tls-atexit-lib.so"))
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{
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printf ("DSO not unloaded yet:\n%s", line);
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return 1;
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}
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}
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free (line);
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return 0;
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}
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