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1836bb2e | 1 | /* Check if internal buffer reallocation work for large paths (BZ #28126) |
dff8da6b | 2 | Copyright (C) 2021-2024 Free Software Foundation, Inc. |
1836bb2e AZ |
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 <errno.h> | |
20 | #include <ftw.h> | |
21 | #include <limits.h> | |
22 | #include <string.h> | |
23 | #include <stdlib.h> | |
24 | #include <support/check.h> | |
25 | #include <support/support.h> | |
26 | #include <support/temp_file.h> | |
27 | #include <support/xunistd.h> | |
28 | #include <stdio.h> | |
29 | ||
30 | static int | |
31 | my_func (const char *file, const struct stat *sb, int flag) | |
32 | { | |
33 | return 0; | |
34 | } | |
35 | ||
36 | static const char folder[NAME_MAX] = { [0 ... 253] = 'a', [254] = '\0' }; | |
37 | ||
38 | #define NSUBFOLDERS 16 | |
39 | static int nsubfolders; | |
40 | ||
41 | static void | |
42 | do_cleanup (void) | |
43 | { | |
44 | xchdir (".."); | |
45 | for (int i = 0; i < nsubfolders; i++) | |
46 | { | |
47 | remove (folder); | |
48 | xchdir (".."); | |
49 | } | |
50 | remove (folder); | |
51 | } | |
52 | #define CLEANUP_HANDLER do_cleanup | |
53 | ||
54 | static void | |
55 | check_mkdir (const char *path) | |
56 | { | |
57 | int r = mkdir (path, 0777); | |
58 | /* Some filesystem such as overlayfs does not support larger path required | |
59 | to trigger the internal buffer reallocation. */ | |
60 | if (r != 0) | |
61 | { | |
62 | if (errno == ENAMETOOLONG) | |
63 | FAIL_UNSUPPORTED ("the filesystem does not support the required" | |
64 | "large path"); | |
65 | else | |
66 | FAIL_EXIT1 ("mkdir (\"%s\", 0%o): %m", folder, 0777); | |
67 | } | |
68 | } | |
69 | ||
70 | static int | |
71 | do_test (void) | |
72 | { | |
73 | char *tempdir = support_create_temp_directory ("tst-bz28126"); | |
74 | ||
75 | /* Create path with various subfolders to force an internal buffer | |
76 | reallocation within ntfw. */ | |
77 | char *path = xasprintf ("%s/%s", tempdir, folder); | |
78 | check_mkdir (path); | |
79 | xchdir (path); | |
80 | free (path); | |
81 | for (int i = 0; i < NSUBFOLDERS - 1; i++) | |
82 | { | |
83 | check_mkdir (folder); | |
84 | xchdir (folder); | |
85 | nsubfolders++; | |
86 | } | |
87 | ||
88 | TEST_COMPARE (ftw (tempdir, my_func, 20), 0); | |
89 | ||
90 | free (tempdir); | |
91 | ||
92 | do_cleanup (); | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | #include <support/test-driver.c> |