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600d9e0c | 1 | /* Test that --glibc-hwcaps-prepend works, using dlopen and /etc/ld.so.cache. |
2b778ceb | 2 | Copyright (C) 2020-2021 Free Software Foundation, Inc. |
600d9e0c FW |
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 | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <dlfcn.h> | |
20 | #include <stddef.h> | |
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <support/check.h> | |
25 | #include <support/support.h> | |
26 | #include <support/xdlfcn.h> | |
27 | #include <support/xunistd.h> | |
28 | ||
29 | /* Invoke /sbin/ldconfig with some error checking. */ | |
30 | static void | |
31 | run_ldconfig (void) | |
32 | { | |
33 | char *command = xasprintf ("%s/ldconfig", support_install_rootsbindir); | |
34 | TEST_COMPARE (system (command), 0); | |
35 | free (command); | |
36 | } | |
37 | ||
38 | /* The library under test. */ | |
39 | #define SONAME "libmarkermod1.so" | |
40 | ||
41 | static int | |
42 | do_test (void) | |
43 | { | |
44 | if (dlopen (SONAME, RTLD_NOW) != NULL) | |
45 | FAIL_EXIT1 (SONAME " is already on the search path"); | |
46 | ||
47 | /* Install the default implementation of libmarkermod1.so. */ | |
48 | xmkdirp ("/etc", 0777); | |
49 | support_write_file_string ("/etc/ld.so.conf", "/glibc-test/lib\n"); | |
50 | xmkdirp ("/glibc-test/lib/glibc-hwcaps/prepend2", 0777); | |
51 | xmkdirp ("/glibc-test/lib/glibc-hwcaps/prepend3", 0777); | |
52 | { | |
53 | char *src = xasprintf ("%s/elf/libmarkermod1-1.so", support_objdir_root); | |
54 | support_copy_file (src, "/glibc-test/lib/" SONAME); | |
55 | free (src); | |
56 | } | |
57 | run_ldconfig (); | |
58 | { | |
59 | /* The default implementation can now be loaded. */ | |
60 | void *handle = xdlopen (SONAME, RTLD_NOW); | |
61 | int (*marker1) (void) = xdlsym (handle, "marker1"); | |
62 | TEST_COMPARE (marker1 (), 1); | |
63 | xdlclose (handle); | |
64 | } | |
65 | ||
66 | /* Add the first override to the directory that is searched last. */ | |
67 | { | |
68 | char *src = xasprintf ("%s/elf/libmarkermod1-2.so", support_objdir_root); | |
69 | support_copy_file (src, "/glibc-test/lib/glibc-hwcaps/prepend2/" | |
70 | SONAME); | |
71 | free (src); | |
72 | } | |
73 | { | |
74 | /* This is still the first implementation. The cache has not been | |
75 | updated. */ | |
76 | void *handle = xdlopen (SONAME, RTLD_NOW); | |
77 | int (*marker1) (void) = xdlsym (handle, "marker1"); | |
78 | TEST_COMPARE (marker1 (), 1); | |
79 | xdlclose (handle); | |
80 | } | |
81 | run_ldconfig (); | |
82 | { | |
83 | /* After running ldconfig, it is the second implementation. */ | |
84 | void *handle = xdlopen (SONAME, RTLD_NOW); | |
85 | int (*marker1) (void) = xdlsym (handle, "marker1"); | |
86 | TEST_COMPARE (marker1 (), 2); | |
87 | xdlclose (handle); | |
88 | } | |
89 | ||
90 | /* Add the second override to the directory that is searched first. */ | |
91 | { | |
92 | char *src = xasprintf ("%s/elf/libmarkermod1-3.so", support_objdir_root); | |
93 | support_copy_file (src, "/glibc-test/lib/glibc-hwcaps/prepend3/" | |
94 | SONAME); | |
95 | free (src); | |
96 | } | |
97 | { | |
98 | /* This is still the second implementation. */ | |
99 | void *handle = xdlopen (SONAME, RTLD_NOW); | |
100 | int (*marker1) (void) = xdlsym (handle, "marker1"); | |
101 | TEST_COMPARE (marker1 (), 2); | |
102 | xdlclose (handle); | |
103 | } | |
104 | run_ldconfig (); | |
105 | { | |
106 | /* After running ldconfig, it is the third implementation. */ | |
107 | void *handle = xdlopen (SONAME, RTLD_NOW); | |
108 | int (*marker1) (void) = xdlsym (handle, "marker1"); | |
109 | TEST_COMPARE (marker1 (), 3); | |
110 | xdlclose (handle); | |
111 | } | |
112 | ||
113 | /* Remove the second override again, without running ldconfig. | |
114 | Ideally, this would revert to implementation 2. However, in the | |
115 | current implementation, the cache returns exactly one file name | |
116 | which does not exist after unlinking, so the dlopen fails. */ | |
117 | xunlink ("/glibc-test/lib/glibc-hwcaps/prepend3/" SONAME); | |
118 | TEST_VERIFY (dlopen (SONAME, RTLD_NOW) == NULL); | |
119 | run_ldconfig (); | |
120 | { | |
121 | /* After running ldconfig, the second implementation is available | |
122 | once more. */ | |
123 | void *handle = xdlopen (SONAME, RTLD_NOW); | |
124 | int (*marker1) (void) = xdlsym (handle, "marker1"); | |
125 | TEST_COMPARE (marker1 (), 2); | |
126 | xdlclose (handle); | |
127 | } | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | static void | |
133 | prepare (int argc, char **argv) | |
134 | { | |
135 | const char *no_restart = "no-restart"; | |
136 | if (argc == 2 && strcmp (argv[1], no_restart) == 0) | |
137 | return; | |
138 | /* Re-execute the test with an explicit loader invocation. */ | |
139 | execl (support_objdir_elf_ldso, | |
140 | support_objdir_elf_ldso, | |
141 | "--glibc-hwcaps-prepend", "prepend3:prepend2", | |
142 | argv[0], no_restart, | |
143 | NULL); | |
144 | printf ("error: execv of %s failed: %m\n", argv[0]); | |
145 | _exit (1); | |
146 | } | |
147 | ||
148 | #define PREPARE prepare | |
149 | #include <support/test-driver.c> |