1 /* Test of getcwd() function.
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/>. */
32 #if ! HAVE_GETPAGESIZE
33 # define getpagesize() 0
36 /* This size is chosen to be larger than PATH_MAX (4k), yet smaller than
37 the 16kB pagesize on ia64 linux. Those conditions make the code below
38 trigger a bug in glibc's getcwd implementation before 2.4.90-10. */
39 #define TARGET_LEN (5 * 1024)
41 /* Keep this test in sync with m4/getcwd-abort-bug.m4. */
45 char const *dir_name = "confdir-14B---";
47 size_t initial_cwd_len;
52 /* The bug is triggered when PATH_MAX < getpagesize (), so skip
53 this relatively expensive and invasive test if that's not true. */
54 if (getpagesize () <= PATH_MAX)
57 cwd = getcwd (NULL, 0);
61 initial_cwd_len = strlen (cwd);
63 desired_depth = ((TARGET_LEN - 1 - initial_cwd_len)
64 / (1 + strlen (dir_name)));
65 for (d = 0; d < desired_depth; d++)
67 if (mkdir (dir_name, S_IRWXU) < 0 || chdir (dir_name) < 0)
69 fail = 3; /* Unable to construct deep hierarchy. */
74 /* If libc has the bug in question, this invocation of getcwd
75 results in a failed assertion. */
76 cwd = getcwd (NULL, 0);
78 fail = 4; /* getcwd failed. This is ok, and expected. */
81 /* Call rmdir first, in case the above chdir failed. */
96 /* The length of this name must be 8. */
97 #define DIR_NAME "confdir3"
98 #define DIR_NAME_LEN 8
99 #define DIR_NAME_SIZE (DIR_NAME_LEN + 1)
101 /* The length of "../". */
102 #define DOTDOTSLASH_LEN 3
104 /* Leftover bytes in the buffer, to work around library or OS bugs. */
107 /* Keep this test in sync with m4/getcwd-path-max.m4. */
109 test_long_name (void)
112 /* The Hurd doesn't define this, so getcwd can't exhibit the bug --
113 at least not on a local file system. And if we were to start worrying
114 about remote file systems, we'd have to enable the wrapper function
115 all of the time, just to be safe. That's not worth the cost. */
117 #elif ((INT_MAX / (DIR_NAME_SIZE / DOTDOTSLASH_LEN + 1) \
118 - DIR_NAME_SIZE - BUF_SLOP) \
120 /* FIXME: Assuming there's a system for which this is true,
121 this should be done in a compile test. */
124 char buf[PATH_MAX * (DIR_NAME_SIZE / DOTDOTSLASH_LEN + 1)
125 + DIR_NAME_SIZE + BUF_SLOP];
126 char *cwd = getcwd (buf, PATH_MAX);
127 size_t initial_cwd_len;
135 cwd_len = initial_cwd_len = strlen (cwd);
139 size_t dotdot_max = PATH_MAX * (DIR_NAME_SIZE / DOTDOTSLASH_LEN);
142 cwd_len += DIR_NAME_SIZE;
143 /* If mkdir or chdir fails, it could be that this system cannot create
144 any file with an absolute name longer than PATH_MAX, such as cygwin.
145 If so, leave fail as 0, because the current working directory can't
146 be too long for getcwd if it can't even be created. For other
147 errors, be pessimistic and consider that as a failure, too. */
148 if (mkdir (DIR_NAME, S_IRWXU) < 0 || chdir (DIR_NAME) < 0)
150 if (! (errno == ERANGE || errno == ENAMETOOLONG))
155 if (PATH_MAX <= cwd_len && cwd_len < PATH_MAX + DIR_NAME_SIZE)
157 c = getcwd (buf, PATH_MAX);
158 if (!c && errno == ENOENT)
163 if (c || ! (errno == ERANGE || errno == ENAMETOOLONG))
170 if (dotdot_max <= cwd_len - initial_cwd_len)
172 if (dotdot_max + DIR_NAME_SIZE < cwd_len - initial_cwd_len)
174 c = getcwd (buf, cwd_len + 1);
177 if (! (errno == ERANGE || errno == ENOENT
178 || errno == ENAMETOOLONG))
183 if (AT_FDCWD || errno == ERANGE || errno == ENOENT)
191 if (c && strlen (c) != cwd_len)
199 /* Leaving behind such a deep directory is not polite.
200 So clean up here, right away, even though the driving
201 shell script would also clean up. */
205 /* Try rmdir first, in case the chdir failed. */
207 for (i = 0; i <= n_chdirs; i++)
209 if (chdir ("..") < 0)
211 if (rmdir (DIR_NAME) != 0)
221 main (int argc, char **argv)
223 return test_abort_bug () + test_long_name ();