| /* Test the xreadlink function. |
| Copyright (C) 2017-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <support/check.h> |
| #include <support/support.h> |
| #include <support/temp_file.h> |
| #include <support/xunistd.h> |
| |
| static int |
| do_test (void) |
| { |
| char *dir = support_create_temp_directory ("tst-xreadlink-"); |
| char *symlink_name = xasprintf ("%s/symlink", dir); |
| add_temp_file (symlink_name); |
| |
| /* The limit 10000 is arbitrary and simply there to prevent an |
| attempt to exhaust all available disk space. */ |
| for (int size = 1; size < 10000; ++size) |
| { |
| char *contents = xmalloc (size + 1); |
| for (int i = 0; i < size; ++i) |
| contents[i] = 'a' + (rand () % 26); |
| contents[size] = '\0'; |
| if (symlink (contents, symlink_name) != 0) |
| { |
| if (errno == ENAMETOOLONG) |
| { |
| printf ("info: ENAMETOOLONG failure at %d bytes\n", size); |
| free (contents); |
| break; |
| } |
| FAIL_EXIT1 ("symlink (%d bytes): %m", size); |
| } |
| |
| char *readlink_result = xreadlink (symlink_name); |
| TEST_VERIFY (strcmp (readlink_result, contents) == 0); |
| free (readlink_result); |
| xunlink (symlink_name); |
| free (contents); |
| } |
| |
| /* Create an empty file to suppress the temporary file deletion |
| warning. */ |
| xclose (xopen (symlink_name, O_WRONLY | O_CREAT, 0)); |
| |
| free (symlink_name); |
| free (dir); |
| |
| return 0; |
| } |
| |
| #include <support/test-driver.c> |