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;
53 /* The bug is triggered when PATH_MAX < getpagesize (), so skip
54 this relatively expensive and invasive test if that's not true. */
55 if (getpagesize () <= PATH_MAX)
59 cwd = getcwd (NULL, 0);
63 initial_cwd_len = strlen (cwd);
65 desired_depth = ((TARGET_LEN - 1 - initial_cwd_len)
66 / (1 + strlen (dir_name)));
67 for (d = 0; d < desired_depth; d++)
69 if (mkdir (dir_name, S_IRWXU) < 0 || chdir (dir_name) < 0)
71 fail = 3; /* Unable to construct deep hierarchy. */
76 /* If libc has the bug in question, this invocation of getcwd
77 results in a failed assertion. */
78 cwd = getcwd (NULL, 0);
80 fail = 4; /* getcwd failed. This is ok, and expected. */
83 /* Call rmdir first, in case the above chdir failed. */
98 /* The length of this name must be 8. */
99 #define DIR_NAME "confdir3"
100 #define DIR_NAME_LEN 8
101 #define DIR_NAME_SIZE (DIR_NAME_LEN + 1)
103 /* The length of "../". */
104 #define DOTDOTSLASH_LEN 3
106 /* Leftover bytes in the buffer, to work around library or OS bugs. */
109 /* Keep this test in sync with m4/getcwd-path-max.m4. */
111 test_long_name (void)
114 /* The Hurd doesn't define this, so getcwd can't exhibit the bug --
115 at least not on a local file system. And if we were to start worrying
116 about remote file systems, we'd have to enable the wrapper function
117 all of the time, just to be safe. That's not worth the cost. */
119 #elif ((INT_MAX / (DIR_NAME_SIZE / DOTDOTSLASH_LEN + 1) \
120 - DIR_NAME_SIZE - BUF_SLOP) \
122 /* FIXME: Assuming there's a system for which this is true,
123 this should be done in a compile test. */
126 char buf[PATH_MAX * (DIR_NAME_SIZE / DOTDOTSLASH_LEN + 1)
127 + DIR_NAME_SIZE + BUF_SLOP];
128 char *cwd = getcwd (buf, PATH_MAX);
129 size_t initial_cwd_len;
137 cwd_len = initial_cwd_len = strlen (cwd);
141 size_t dotdot_max = PATH_MAX * (DIR_NAME_SIZE / DOTDOTSLASH_LEN);
144 cwd_len += DIR_NAME_SIZE;
145 /* If mkdir or chdir fails, it could be that this system cannot create
146 any file with an absolute name longer than PATH_MAX, such as cygwin.
147 If so, leave fail as 0, because the current working directory can't
148 be too long for getcwd if it can't even be created. For other
149 errors, be pessimistic and consider that as a failure, too. */
150 if (mkdir (DIR_NAME, S_IRWXU) < 0 || chdir (DIR_NAME) < 0)
152 if (! (errno == ERANGE || errno == ENAMETOOLONG))
157 if (PATH_MAX <= cwd_len && cwd_len < PATH_MAX + DIR_NAME_SIZE)
159 c = getcwd (buf, PATH_MAX);
160 if (!c && errno == ENOENT)
165 if (c || ! (errno == ERANGE || errno == ENAMETOOLONG))
172 if (dotdot_max <= cwd_len - initial_cwd_len)
174 if (dotdot_max + DIR_NAME_SIZE < cwd_len - initial_cwd_len)
176 c = getcwd (buf, cwd_len + 1);
179 if (! (errno == ERANGE || errno == ENOENT
180 || errno == ENAMETOOLONG))
185 if (AT_FDCWD || errno == ERANGE || errno == ENOENT)
193 if (c && strlen (c) != cwd_len)
201 /* Leaving behind such a deep directory is not polite.
202 So clean up here, right away, even though the driving
203 shell script would also clean up. */
207 /* Try rmdir first, in case the chdir failed. */
209 for (i = 0; i <= n_chdirs; i++)
211 if (chdir ("..") < 0)
213 if (rmdir (DIR_NAME) != 0)
223 main (int argc, char **argv)
225 return test_abort_bug () + test_long_name ();