1 | /* Test the xreadlink function. |
2 | Copyright (C) 2017-2022 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 <fcntl.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/temp_file.h> |
27 | #include <support/xunistd.h> |
28 | |
29 | static int |
30 | do_test (void) |
31 | { |
32 | char *dir = support_create_temp_directory (base: "tst-xreadlink-" ); |
33 | char *symlink_name = xasprintf (format: "%s/symlink" , dir); |
34 | add_temp_file (name: symlink_name); |
35 | |
36 | /* The limit 10000 is arbitrary and simply there to prevent an |
37 | attempt to exhaust all available disk space. */ |
38 | for (int size = 1; size < 10000; ++size) |
39 | { |
40 | char *contents = xmalloc (n: size + 1); |
41 | for (int i = 0; i < size; ++i) |
42 | contents[i] = 'a' + (rand () % 26); |
43 | contents[size] = '\0'; |
44 | if (symlink (from: contents, to: symlink_name) != 0) |
45 | { |
46 | if (errno == ENAMETOOLONG) |
47 | { |
48 | printf (format: "info: ENAMETOOLONG failure at %d bytes\n" , size); |
49 | free (ptr: contents); |
50 | break; |
51 | } |
52 | FAIL_EXIT1 ("symlink (%d bytes): %m" , size); |
53 | } |
54 | |
55 | char *readlink_result = xreadlink (path: symlink_name); |
56 | TEST_VERIFY (strcmp (readlink_result, contents) == 0); |
57 | free (ptr: readlink_result); |
58 | xunlink (path: symlink_name); |
59 | free (ptr: contents); |
60 | } |
61 | |
62 | /* Create an empty file to suppress the temporary file deletion |
63 | warning. */ |
64 | xclose (xopen (path: symlink_name, O_WRONLY | O_CREAT, 0)); |
65 | |
66 | free (ptr: symlink_name); |
67 | free (ptr: dir); |
68 | |
69 | return 0; |
70 | } |
71 | |
72 | #include <support/test-driver.c> |
73 | |