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1ffe1ccb | 1 | /* Test the xreadlink function. |
d614a753 | 2 | Copyright (C) 2017-2020 Free Software Foundation, Inc. |
1ffe1ccb FW |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
1ffe1ccb FW |
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 | { | |
8adfb0ee | 32 | char *dir = support_create_temp_directory ("tst-xreadlink-"); |
1ffe1ccb FW |
33 | char *symlink_name = xasprintf ("%s/symlink", dir); |
34 | add_temp_file (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 (size + 1); | |
41 | for (int i = 0; i < size; ++i) | |
42 | contents[i] = 'a' + (rand () % 26); | |
43 | contents[size] = '\0'; | |
44 | if (symlink (contents, symlink_name) != 0) | |
45 | { | |
46 | if (errno == ENAMETOOLONG) | |
47 | { | |
48 | printf ("info: ENAMETOOLONG failure at %d bytes\n", size); | |
49 | free (contents); | |
50 | break; | |
51 | } | |
52 | FAIL_EXIT1 ("symlink (%d bytes): %m", size); | |
53 | } | |
54 | ||
55 | char *readlink_result = xreadlink (symlink_name); | |
56 | TEST_VERIFY (strcmp (readlink_result, contents) == 0); | |
57 | free (readlink_result); | |
58 | xunlink (symlink_name); | |
59 | free (contents); | |
60 | } | |
61 | ||
62 | /* Create an empty file to suppress the temporary file deletion | |
63 | warning. */ | |
64 | xclose (xopen (symlink_name, O_WRONLY | O_CREAT, 0)); | |
65 | ||
66 | free (symlink_name); | |
67 | free (dir); | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | #include <support/test-driver.c> |