diff options
Diffstat (limited to 'REORG.TODO/stdlib/tst-tls-atexit.c')
| -rw-r--r-- | REORG.TODO/stdlib/tst-tls-atexit.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/REORG.TODO/stdlib/tst-tls-atexit.c b/REORG.TODO/stdlib/tst-tls-atexit.c new file mode 100644 index 0000000000..6dbf49d460 --- /dev/null +++ b/REORG.TODO/stdlib/tst-tls-atexit.c @@ -0,0 +1,156 @@ +/* Verify that DSO is unloaded only if its TLS objects are destroyed. + Copyright (C) 2013-2017 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 <dlfcn.h> +#include <pthread.h> +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <link.h> +#include <stdbool.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)) dlsym (h, "reg_dtor"); + + if (reg_dtor == NULL) + { + printf ("Unable to find symbol: %s\n", dlerror ()); + return (void *) (uintptr_t) 1; + } + + reg_dtor (); + +#ifndef NO_DELETE + dlclose (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 = dlopen (DSO_NAME, RTLD_LAZY); + if (h1 == NULL) + { + printf ("h1: Unable to load DSO: %s\n", dlerror ()); + return 1; + } + +#ifndef NO_DELETE + if (spawn_thread (h1) != 0) + return 1; +#endif + + void *h2 = dlopen (DSO_NAME, H2_RTLD_FLAGS); + if (h2 == NULL) + { + printf ("h2: Unable to load DSO: %s\n", dlerror ()); + return 1; + } + +#ifdef NO_DELETE + if (spawn_thread (h1) != 0) + return 1; + + dlclose (h1); +#endif + dlclose (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" |