1 | /* Check if internal buffer reallocation work for large paths (BZ #28126) |
2 | Copyright (C) 2021-2022 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 <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 (path: ".." ); |
45 | for (int i = 0; i < nsubfolders; i++) |
46 | { |
47 | remove (folder); |
48 | xchdir (path: ".." ); |
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: path, mode: 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 (base: "tst-bz28126" ); |
74 | |
75 | /* Create path with various subfolders to force an internal buffer |
76 | reallocation within ntfw. */ |
77 | char *path = xasprintf (format: "%s/%s" , tempdir, folder); |
78 | check_mkdir (path); |
79 | xchdir (path); |
80 | free (ptr: path); |
81 | for (int i = 0; i < NSUBFOLDERS - 1; i++) |
82 | { |
83 | check_mkdir (path: folder); |
84 | xchdir (path: folder); |
85 | nsubfolders++; |
86 | } |
87 | |
88 | TEST_COMPARE (ftw (tempdir, my_func, 20), 0); |
89 | |
90 | free (ptr: tempdir); |
91 | |
92 | do_cleanup (); |
93 | |
94 | return 0; |
95 | } |
96 | |
97 | #include <support/test-driver.c> |
98 | |