2 Copyright (C) 2009-2011 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* Written by Eric Blake <ebb9@byu.net>, 2009. */
23 #include "signature.h"
24 SIGNATURE_CHECK (linkat, int, (int, char const *, int, char const *, int));
34 #include "areadlink.h"
35 #include "filenamecat.h"
36 #include "same-inode.h"
37 #include "ignore-value.h"
40 #define BASE "test-linkat.t"
42 #include "test-link.h"
44 static int dfd1 = AT_FDCWD;
45 static int dfd2 = AT_FDCWD;
46 static int flag = AT_SYMLINK_FOLLOW;
48 /* Wrapper to test linkat like link. */
50 do_link (char const *name1, char const *name2)
52 return linkat (dfd1, name1, dfd2, name2, flag);
55 /* Can we expect that link() and linkat(), when called on a symlink,
56 increment the link count of that symlink? */
57 #if LINK_FOLLOWS_SYMLINKS == 0
58 # define EXPECT_LINK_HARDLINKS_SYMLINKS 1
59 #elif LINK_FOLLOWS_SYMLINKS == -1
61 # define EXPECT_LINK_HARDLINKS_SYMLINKS (__xpg4 == 0)
63 # define EXPECT_LINK_HARDLINKS_SYMLINKS 0
66 /* Wrapper to see if two symlinks act the same. */
68 check_same_link (char const *name1, char const *name2)
74 ASSERT (lstat (name1, &st1) == 0);
75 ASSERT (lstat (name2, &st2) == 0);
76 contents1 = areadlink_with_size (name1, st1.st_size);
77 contents2 = areadlink_with_size (name2, st2.st_size);
80 ASSERT (strcmp (contents1, contents2) == 0);
81 if (EXPECT_LINK_HARDLINKS_SYMLINKS)
82 ASSERT (SAME_INODE (st1, st2));
95 /* Clean up any trash from prior testsuite runs. */
96 ignore_value (system ("rm -rf " BASE "*"));
98 /* Test basic link functionality, without mentioning symlinks. */
99 result = test_link (do_link, true);
100 dfd1 = open (".", O_RDONLY);
102 ASSERT (test_link (do_link, false) == result);
104 ASSERT (test_link (do_link, false) == result);
106 ASSERT (test_link (do_link, false) == result);
108 ASSERT (test_link (do_link, false) == result);
110 ASSERT (test_link (do_link, false) == result);
112 ASSERT (test_link (do_link, false) == result);
113 ASSERT (close (dfd1) == 0);
115 ASSERT (test_link (do_link, false) == result);
117 /* Create locations to manipulate. */
118 ASSERT (mkdir (BASE "sub1", 0700) == 0);
119 ASSERT (mkdir (BASE "sub2", 0700) == 0);
120 ASSERT (close (creat (BASE "00", 0600)) == 0);
121 cwd = getcwd (NULL, 0);
124 dfd = open (BASE "sub1", O_RDONLY);
126 ASSERT (chdir (BASE "sub2") == 0);
128 /* There are 16 possible scenarios, based on whether an fd is
129 AT_FDCWD or real, whether a file is absolute or relative, coupled
130 with whether flag is set for 32 iterations.
132 To ensure that we test all of the code paths (rather than
133 triggering early normalization optimizations), we use a loop to
134 repeatedly rename a file in the parent directory, use an fd open
135 on subdirectory 1, all while executing in subdirectory 2; all
136 relative names are thus given with a leading "../". Finally, the
137 last scenario (two relative paths given, neither one AT_FDCWD)
138 has two paths, based on whether the two fds are equivalent, so we
139 do the other variant after the loop. */
140 for (i = 0; i < 32; i++)
142 int fd1 = (i & 8) ? dfd : AT_FDCWD;
143 char *file1 = mfile_name_concat ((i & 4) ? ".." : cwd, BASE "xx", NULL);
144 int fd2 = (i & 2) ? dfd : AT_FDCWD;
145 char *file2 = mfile_name_concat ((i & 1) ? ".." : cwd, BASE "xx", NULL);
148 flag = (i & 0x10 ? AT_SYMLINK_FOLLOW : 0);
150 ASSERT (sprintf (strchr (file1, '\0') - 2, "%02d", i) == 2);
151 ASSERT (sprintf (strchr (file2, '\0') - 2, "%02d", i + 1) == 2);
152 ASSERT (linkat (fd1, file1, fd2, file2, flag) == 0);
153 ASSERT (unlinkat (fd1, file1, 0) == 0);
157 dfd2 = open ("..", O_RDONLY);
159 ASSERT (linkat (dfd, "../" BASE "32", dfd2, BASE "33", 0) == 0);
160 ASSERT (linkat (dfd, "../" BASE "33", dfd2, BASE "34",
161 AT_SYMLINK_FOLLOW) == 0);
162 ASSERT (close (dfd2) == 0);
164 /* Now we change back to the parent directory, and set dfd to ".",
165 in order to test behavior on symlinks. */
166 ASSERT (chdir ("..") == 0);
167 ASSERT (close (dfd) == 0);
168 if (symlink (BASE "sub1", BASE "link1"))
170 ASSERT (unlink (BASE "32") == 0);
171 ASSERT (unlink (BASE "33") == 0);
172 ASSERT (unlink (BASE "34") == 0);
173 ASSERT (rmdir (BASE "sub1") == 0);
174 ASSERT (rmdir (BASE "sub2") == 0);
177 fputs ("skipping test: symlinks not supported on this file system\n",
181 dfd = open (".", O_RDONLY);
183 ASSERT (symlink (BASE "34", BASE "link2") == 0);
184 ASSERT (symlink (BASE "link3", BASE "link3") == 0);
185 ASSERT (symlink (BASE "nowhere", BASE "link4") == 0);
187 /* Link cannot overwrite existing files. */
189 ASSERT (linkat (dfd, BASE "link1", dfd, BASE "sub1", 0) == -1);
190 ASSERT (errno == EEXIST);
192 ASSERT (linkat (dfd, BASE "link1/", dfd, BASE "sub1", 0) == -1);
193 ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES);
195 ASSERT (linkat (dfd, BASE "link1", dfd, BASE "sub1/", 0) == -1);
196 ASSERT (errno == EEXIST || errno == ENOTDIR);
198 ASSERT (linkat (dfd, BASE "link1", dfd, BASE "sub1",
199 AT_SYMLINK_FOLLOW) == -1);
200 ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES);
202 ASSERT (linkat (dfd, BASE "link1/", dfd, BASE "sub1",
203 AT_SYMLINK_FOLLOW) == -1);
204 ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES);
206 ASSERT (linkat (dfd, BASE "link1", dfd, BASE "sub1/",
207 AT_SYMLINK_FOLLOW) == -1);
208 ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES);
210 ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link2", 0) == -1);
211 ASSERT (errno == EEXIST);
213 ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link2",
214 AT_SYMLINK_FOLLOW) == -1);
215 ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES);
217 ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link3", 0) == -1);
218 ASSERT (errno == EEXIST || errno == ELOOP);
220 ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link3",
221 AT_SYMLINK_FOLLOW) == -1);
222 ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES
225 ASSERT (linkat (dfd, BASE "link2", dfd, BASE "link3", 0) == -1);
226 ASSERT (errno == EEXIST || errno == ELOOP);
228 ASSERT (linkat (dfd, BASE "link2", dfd, BASE "link3",
229 AT_SYMLINK_FOLLOW) == -1);
230 ASSERT (errno == EEXIST || errno == ELOOP);
232 /* AT_SYMLINK_FOLLOW only follows first argument, not second. */
234 ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link4", 0) == -1);
235 ASSERT (errno == EEXIST);
236 ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link4",
237 AT_SYMLINK_FOLLOW) == -1);
238 ASSERT (errno == EEXIST || errno == EPERM || errno == EACCES);
240 ASSERT (linkat (dfd, BASE "34", dfd, BASE "link4", 0) == -1);
241 ASSERT (errno == EEXIST);
243 ASSERT (linkat (dfd, BASE "34", dfd, BASE "link4", AT_SYMLINK_FOLLOW) == -1);
244 ASSERT (errno == EEXIST);
246 /* Trailing slash handling. */
248 ASSERT (linkat (dfd, BASE "link2/", dfd, BASE "link5", 0) == -1);
249 ASSERT (errno == ENOTDIR);
251 ASSERT (linkat (dfd, BASE "link2/", dfd, BASE "link5",
252 AT_SYMLINK_FOLLOW) == -1);
253 ASSERT (errno == ENOTDIR);
255 ASSERT (linkat (dfd, BASE "link3/", dfd, BASE "link5", 0) == -1);
256 ASSERT (errno == ELOOP);
258 ASSERT (linkat (dfd, BASE "link3/", dfd, BASE "link5",
259 AT_SYMLINK_FOLLOW) == -1);
260 ASSERT (errno == ELOOP);
262 ASSERT (linkat (dfd, BASE "link4/", dfd, BASE "link5", 0) == -1);
263 ASSERT (errno == ENOENT);
265 ASSERT (linkat (dfd, BASE "link4/", dfd, BASE "link5",
266 AT_SYMLINK_FOLLOW) == -1);
267 ASSERT (errno == ENOENT);
269 /* Check for hard links to symlinks. */
270 ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link5", 0) == 0);
271 check_same_link (BASE "link1", BASE "link5");
272 ASSERT (unlink (BASE "link5") == 0);
274 ASSERT (linkat (dfd, BASE "link1", dfd, BASE "link5",
275 AT_SYMLINK_FOLLOW) == -1);
276 ASSERT (errno == EPERM || errno == EACCES);
277 ASSERT (linkat (dfd, BASE "link2", dfd, BASE "link5", 0) == 0);
278 check_same_link (BASE "link2", BASE "link5");
279 ASSERT (unlink (BASE "link5") == 0);
280 ASSERT (linkat (dfd, BASE "link2", dfd, BASE "file", AT_SYMLINK_FOLLOW) == 0);
282 ASSERT (areadlink (BASE "file") == NULL);
283 ASSERT (errno == EINVAL);
284 ASSERT (unlink (BASE "file") == 0);
285 ASSERT (linkat (dfd, BASE "link3", dfd, BASE "link5", 0) == 0);
286 check_same_link (BASE "link3", BASE "link5");
287 ASSERT (unlink (BASE "link5") == 0);
289 ASSERT (linkat (dfd, BASE "link3", dfd, BASE "link5",
290 AT_SYMLINK_FOLLOW) == -1);
291 ASSERT (errno == ELOOP);
292 ASSERT (linkat (dfd, BASE "link4", dfd, BASE "link5", 0) == 0);
293 check_same_link (BASE "link4", BASE "link5");
294 ASSERT (unlink (BASE "link5") == 0);
296 ASSERT (linkat (dfd, BASE "link4", dfd, BASE "link5",
297 AT_SYMLINK_FOLLOW) == -1);
298 ASSERT (errno == ENOENT);
300 /* Check that symlink to symlink to file is followed all the way. */
301 ASSERT (symlink (BASE "link2", BASE "link5") == 0);
302 ASSERT (linkat (dfd, BASE "link5", dfd, BASE "link6", 0) == 0);
303 check_same_link (BASE "link5", BASE "link6");
304 ASSERT (unlink (BASE "link6") == 0);
305 ASSERT (linkat (dfd, BASE "link5", dfd, BASE "file", AT_SYMLINK_FOLLOW) == 0);
307 ASSERT (areadlink (BASE "file") == NULL);
308 ASSERT (errno == EINVAL);
309 ASSERT (unlink (BASE "file") == 0);
310 ASSERT (unlink (BASE "link5") == 0);
311 ASSERT (symlink (BASE "link3", BASE "link5") == 0);
313 ASSERT (linkat (dfd, BASE "link5", dfd, BASE "file",
314 AT_SYMLINK_FOLLOW) == -1);
315 ASSERT (errno == ELOOP);
316 ASSERT (unlink (BASE "link5") == 0);
317 ASSERT (symlink (BASE "link4", BASE "link5") == 0);
319 ASSERT (linkat (dfd, BASE "link5", dfd, BASE "file",
320 AT_SYMLINK_FOLLOW) == -1);
321 ASSERT (errno == ENOENT);
323 /* Now for some real fun with directory crossing. */
324 ASSERT (symlink (cwd, BASE "sub1/link") == 0);
325 ASSERT (symlink (".././/" BASE "sub1/link/" BASE "link2",
326 BASE "sub2/link") == 0);
327 ASSERT (close (dfd) == 0);
328 dfd = open (BASE "sub1", O_RDONLY);
330 dfd2 = open (BASE "sub2", O_RDONLY);
332 ASSERT (linkat (dfd, "../" BASE "sub2/link", dfd2, "./..//" BASE "sub1/file",
333 AT_SYMLINK_FOLLOW) == 0);
335 ASSERT (areadlink (BASE "sub1/file") == NULL);
336 ASSERT (errno == EINVAL);
339 ASSERT (close (dfd) == 0);
340 ASSERT (close (dfd2) == 0);
341 ASSERT (unlink (BASE "sub1/file") == 0);
342 ASSERT (unlink (BASE "sub1/link") == 0);
343 ASSERT (unlink (BASE "sub2/link") == 0);
344 ASSERT (unlink (BASE "32") == 0);
345 ASSERT (unlink (BASE "33") == 0);
346 ASSERT (unlink (BASE "34") == 0);
347 ASSERT (rmdir (BASE "sub1") == 0);
348 ASSERT (rmdir (BASE "sub2") == 0);
349 ASSERT (unlink (BASE "link1") == 0);
350 ASSERT (unlink (BASE "link2") == 0);
351 ASSERT (unlink (BASE "link3") == 0);
352 ASSERT (unlink (BASE "link4") == 0);
353 ASSERT (unlink (BASE "link5") == 0);