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ba384f6e | 1 | /* Verify that DSO is unloaded only if its TLS objects are destroyed. |
581c785b | 2 | Copyright (C) 2013-2022 Free Software Foundation, Inc. |
ba384f6e SP |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
ba384f6e | 18 | |
90b37cac SP |
19 | /* For the default case, i.e. NO_DELETE not defined, the test dynamically loads |
20 | a DSO and spawns a thread that subsequently calls into the DSO to register a | |
21 | destructor for an object in the DSO and then calls dlclose on the handle for | |
22 | the DSO. When the thread exits, the DSO should not be unloaded or else the | |
23 | destructor called during thread exit will crash. Further in the main | |
24 | thread, the DSO is opened and closed again, at which point the DSO should be | |
25 | unloaded. | |
26 | ||
27 | When NO_DELETE is defined, the DSO is loaded twice, once with just RTLD_LAZY | |
28 | flag and the second time with the RTLD_NODELETE flag set. The thread is | |
29 | spawned, destructor registered and then thread exits without closing the | |
30 | DSO. In the main thread, the first handle is then closed, followed by the | |
31 | second handle. In the end, the DSO should remain loaded due to the | |
32 | RTLD_NODELETE flag being set in the second dlopen call. */ | |
ba384f6e | 33 | |
ba384f6e SP |
34 | #include <pthread.h> |
35 | #include <stdio.h> | |
36 | #include <unistd.h> | |
37 | #include <string.h> | |
38 | #include <errno.h> | |
d72c2763 | 39 | #include <link.h> |
ceaa9889 | 40 | #include <stdbool.h> |
1cc9e59a | 41 | #include <support/xdlfcn.h> |
ba384f6e | 42 | |
90b37cac SP |
43 | #ifndef NO_DELETE |
44 | # define LOADED_IS_GOOD false | |
45 | #endif | |
46 | ||
47 | #ifndef H2_RTLD_FLAGS | |
48 | # define H2_RTLD_FLAGS (RTLD_LAZY) | |
49 | #endif | |
50 | ||
d72c2763 | 51 | #define DSO_NAME "$ORIGIN/tst-tls-atexit-lib.so" |
ba384f6e | 52 | |
d72c2763 SP |
53 | /* Walk through the map in the _r_debug structure to see if our lib is still |
54 | loaded. */ | |
55 | static bool | |
56 | is_loaded (void) | |
ba384f6e | 57 | { |
d72c2763 | 58 | struct link_map *lm = (struct link_map *) _r_debug.r_map; |
ba384f6e | 59 | |
d72c2763 SP |
60 | for (; lm; lm = lm->l_next) |
61 | if (lm->l_type == lt_loaded && lm->l_name | |
62 | && strcmp (basename (DSO_NAME), basename (lm->l_name)) == 0) | |
90b37cac SP |
63 | { |
64 | printf ("%s is still loaded\n", lm->l_name); | |
65 | return true; | |
66 | } | |
d72c2763 SP |
67 | return false; |
68 | } | |
69 | ||
70 | /* Accept a valid handle returned by DLOPEN, load the reg_dtor symbol to | |
71 | register a destructor and then call dlclose on the handle. The dlclose | |
72 | should not unload the DSO since the destructor has not been called yet. */ | |
73 | static void * | |
74 | reg_dtor_and_close (void *h) | |
75 | { | |
1cc9e59a | 76 | void (*reg_dtor) (void) = (void (*) (void)) xdlsym (h, "reg_dtor"); |
ba384f6e | 77 | |
d72c2763 | 78 | reg_dtor (); |
ba384f6e | 79 | |
90b37cac | 80 | #ifndef NO_DELETE |
1cc9e59a | 81 | xdlclose (h); |
90b37cac | 82 | #endif |
ba384f6e SP |
83 | |
84 | return NULL; | |
85 | } | |
86 | ||
29955b5d | 87 | static int |
d72c2763 | 88 | spawn_thread (void *h) |
ba384f6e SP |
89 | { |
90 | pthread_t t; | |
91 | int ret; | |
92 | void *thr_ret; | |
93 | ||
d72c2763 | 94 | if ((ret = pthread_create (&t, NULL, reg_dtor_and_close, h)) != 0) |
ba384f6e SP |
95 | { |
96 | printf ("pthread_create failed: %s\n", strerror (ret)); | |
97 | return 1; | |
98 | } | |
99 | ||
100 | if ((ret = pthread_join (t, &thr_ret)) != 0) | |
101 | { | |
38b75949 | 102 | printf ("pthread_join failed: %s\n", strerror (ret)); |
ba384f6e SP |
103 | return 1; |
104 | } | |
105 | ||
106 | if (thr_ret != NULL) | |
107 | return 1; | |
108 | ||
d72c2763 SP |
109 | return 0; |
110 | } | |
ba384f6e | 111 | |
d72c2763 SP |
112 | static int |
113 | do_test (void) | |
114 | { | |
115 | /* Load the DSO. */ | |
1cc9e59a | 116 | void *h1 = xdlopen (DSO_NAME, RTLD_LAZY); |
ba384f6e | 117 | |
90b37cac | 118 | #ifndef NO_DELETE |
d72c2763 SP |
119 | if (spawn_thread (h1) != 0) |
120 | return 1; | |
90b37cac | 121 | #endif |
d72c2763 | 122 | |
1cc9e59a | 123 | void *h2 = xdlopen (DSO_NAME, H2_RTLD_FLAGS); |
d72c2763 | 124 | |
90b37cac SP |
125 | #ifdef NO_DELETE |
126 | if (spawn_thread (h1) != 0) | |
d72c2763 | 127 | return 1; |
ba384f6e | 128 | |
1cc9e59a | 129 | xdlclose (h1); |
90b37cac | 130 | #endif |
1cc9e59a | 131 | xdlclose (h2); |
90b37cac SP |
132 | |
133 | /* Check link maps to ensure that the DSO has unloaded. In the normal case, | |
134 | the DSO should be unloaded if there are no uses. However, if one of the | |
135 | dlopen calls were with RTLD_NODELETE, the DSO should remain loaded. */ | |
136 | return is_loaded () == LOADED_IS_GOOD ? 0 : 1; | |
ba384f6e | 137 | } |
29955b5d AS |
138 | |
139 | #define TEST_FUNCTION do_test () | |
140 | #include "../test-skeleton.c" |