1 /* Verify that RTLD_NOLOAD works as expected.
2
3 Copyright (C) 2016-2022 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20 #include <dlfcn.h>
21 #include <stdio.h>
22 #include <gnu/lib-names.h>
23
24 static int
do_test(void)25 do_test (void)
26 {
27 /* Test that no object is loaded with RTLD_NOLOAD. */
28 void *h1 = dlopen (LIBM_SO, RTLD_LAZY | RTLD_NOLOAD);
29 if (h1 != NULL)
30 {
31 printf ("h1: DSO has been loaded while it should have not\n");
32 return 1;
33 }
34
35 /* This used to segfault in some glibc versions. */
36 void *h2 = dlopen (LIBM_SO, RTLD_LAZY | RTLD_NOLOAD | RTLD_NODELETE);
37 if (h2 != NULL)
38 {
39 printf ("h2: DSO has been loaded while it should have not\n");
40 return 1;
41 }
42
43 /* Test that loading an already loaded object returns the same. */
44 void *h3 = dlopen (LIBM_SO, RTLD_LAZY);
45 if (h3 == NULL)
46 {
47 printf ("h3: failed to open DSO: %s\n", dlerror ());
48 return 1;
49 }
50 void *h4 = dlopen (LIBM_SO, RTLD_LAZY | RTLD_NOLOAD);
51 if (h4 == NULL)
52 {
53 printf ("h4: failed to open DSO: %s\n", dlerror ());
54 return 1;
55 }
56 if (h4 != h3)
57 {
58 printf ("h4: should return the same object\n");
59 return 1;
60 }
61
62 /* Cleanup */
63 if (dlclose (h3) != 0)
64 {
65 printf ("h3: dlclose failed: %s\n", dlerror ());
66 return 1;
67 }
68
69 return 0;
70 }
71
72 #include <support/test-driver.c>
73