1 | /* BZ #24024 strerror and errno test. |
2 | |
3 | Copyright (C) 2019-2022 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 <errno.h> |
22 | #include <string.h> |
23 | |
24 | #include <support/check.h> |
25 | #include <support/support.h> |
26 | |
27 | /* malloc is allowed to change errno to a value different than 0, even when |
28 | there is no actual error. This happens for example when the memory |
29 | allocation through sbrk fails. Simulate this by interposing our own |
30 | malloc implementation which sets errno to ENOMEM and calls the original |
31 | malloc. */ |
32 | void |
33 | *malloc (size_t size) |
34 | { |
35 | static void *(*real_malloc) (size_t size); |
36 | |
37 | if (!real_malloc) |
38 | real_malloc = dlsym (RTLD_NEXT, name: "malloc" ); |
39 | |
40 | errno = ENOMEM; |
41 | |
42 | return (*real_malloc) (size); |
43 | } |
44 | |
45 | /* strerror must not change the value of errno. Unfortunately due to GCC bug |
46 | #88576, this happens when -fmath-errno is used. This simple test checks |
47 | that it doesn't happen. */ |
48 | static int |
49 | do_test (void) |
50 | { |
51 | char *msg; |
52 | |
53 | errno = 0; |
54 | msg = strerror (errnum: -3); |
55 | (void) msg; |
56 | TEST_COMPARE (errno, 0); |
57 | |
58 | locale_t l = xnewlocale (LC_ALL_MASK, locale: "C" , NULL); |
59 | msg = strerror_l (errnum: -3, l: l); |
60 | (void) msg; |
61 | TEST_COMPARE (errno, 0); |
62 | |
63 | return 0; |
64 | } |
65 | |
66 | #include <support/test-driver.c> |
67 | |