1/* Test error reporting for dlsym, dlvsym failures.
2 Copyright (C) 2016-2024 Free Software Foundation, Inc.
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 <gnu/lib-names.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24
25/* Used to disambiguate symbol names. */
26static int counter;
27
28static void
29test_one (void *handle, const char *name, void *(func) (void *, const char *),
30 const char *suffix)
31{
32 ++counter;
33 char symbol[32];
34 snprintf (s: symbol, maxlen: sizeof (symbol), format: "no_such_symbol_%d", counter);
35 char *expected_message;
36 if (asprintf (ptr: &expected_message, fmt: ": undefined symbol: %s%s",
37 symbol, suffix) < 0)
38 {
39 printf (format: "error: asprintf: %m\n");
40 abort ();
41 }
42
43 void *addr = func (handle, symbol);
44 if (addr != NULL)
45 {
46 printf (format: "error: %s: found symbol \"no_such_symbol\"\n", name);
47 abort ();
48 }
49 const char *message = dlerror ();
50 if (message == NULL)
51 {
52 printf (format: "error: %s: missing error message\n", name);
53 abort ();
54 }
55 const char *message_without_path = strchrnul (s: message, c: ':');
56 if (strcmp (s1: message_without_path, s2: expected_message) != 0)
57 {
58 printf (format: "error: %s: unexpected error message: %s\n", name, message);
59 abort ();
60 }
61 free (ptr: expected_message);
62
63 message = dlerror ();
64 if (message != NULL)
65 {
66 printf (format: "error: %s: unexpected error message: %s\n", name, message);
67 abort ();
68 }
69}
70
71static void
72test_handles (const char *name, void *(func) (void *, const char *),
73 const char *suffix)
74{
75 test_one (RTLD_DEFAULT, name, func, suffix);
76 test_one (RTLD_NEXT, name, func, suffix);
77
78 void *handle = dlopen (LIBC_SO, RTLD_LAZY);
79 if (handle == NULL)
80 {
81 printf (format: "error: cannot dlopen %s: %s\n", LIBC_SO, dlerror ());
82 abort ();
83 }
84 test_one (handle, name, func, suffix);
85 dlclose (handle: handle);
86}
87
88static void *
89dlvsym_no_such_version (void *handle, const char *name)
90{
91 return dlvsym (handle: handle, name: name, version: "NO_SUCH_VERSION");
92}
93
94static void *
95dlvsym_glibc_private (void *handle, const char *name)
96{
97 return dlvsym (handle: handle, name: name, version: "GLIBC_PRIVATE");
98}
99
100static int
101do_test (void)
102{
103 test_handles (name: "dlsym", func: dlsym, suffix: "");
104 test_handles (name: "dlvsym", func: dlvsym_no_such_version,
105 suffix: ", version NO_SUCH_VERSION");
106 test_handles (name: "dlvsym", func: dlvsym_glibc_private,
107 suffix: ", version GLIBC_PRIVATE");
108
109 return 0;
110}
111
112
113#include <support/test-driver.c>
114

source code of glibc/elf/tst-dlsym-error.c