1 /*
2 *
3 * Copyright (c) International Business Machines Corp., 2001
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program 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
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 /*
21 * Test Name : readlink01
22 *
23 * Test Description :
24 * Verify that, readlink will succeed to read the contents of the symbolic
25 * link created the process.
26 *
27 * Expected Result:
28 * readlink() should return the contents of symbolic link path in the buffer
29 * on success.
30 *
31 * Algorithm:
32 * Setup:
33 * Setup signal handling.
34 * Create temporary directory.
35 * Pause for SIGUSR1 if option specified.
36 *
37 * Test:
38 * Loop if the proper options are given.
39 * Execute system call
40 * Check return code, if system call failed (return=-1)
41 * Issue a FAIL message.
42 * Otherwise,
43 * Verify the Functionality of system call
44 * if successful,
45 * Issue Functionality-Pass message.
46 * Otherwise,
47 * Issue Functionality-Fail message.
48 * Cleanup:
49 * Print errno log and/or timing stats if options given
50 * Delete the temporary directory created.
51 *
52 * Usage: <for command-line>
53 * readlink01 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
54 * where, -c n : Run n copies concurrently.
55 * -f : Turn off functionality Testing.
56 * -i n : Execute test n times.
57 * -I x : Execute test for x seconds.
58 * -P x : Pause for x seconds between iterations.
59 * -t : Turn on syscall timing.
60 *
61 * HISTORY
62 * 07/2001 Ported by Wayne Boyer
63 *
64 * RESTRICTIONS:
65 * This test should be run by 'non-super-user' only.
66 *
67 */
68 #include <unistd.h>
69 #include <fcntl.h>
70 #include <errno.h>
71 #include <sys/stat.h>
72 #include <pwd.h>
73
74 #include "test.h"
75 #include "safe_macros.h"
76
77 #define TESTFILE "testfile"
78 #define SYMFILE "slink_file"
79 #define FILE_MODE S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
80 #define MAX_SIZE 256
81
82 char *TCID = "readlink01";
83 int TST_TOTAL = 1;
84
85 const int exp_val = sizeof(TESTFILE) - 1; /* strlen of testfile */
86
87 void setup();
88 void cleanup();
89
90 char nobody_uid[] = "nobody";
91 struct passwd *ltpuser;
92
main(int ac,char ** av)93 int main(int ac, char **av)
94 {
95 char buffer[MAX_SIZE]; /* temporary buffer to hold symlink contents */
96 int lc;
97
98 tst_parse_opts(ac, av, NULL, NULL);
99
100 setup();
101
102 for (lc = 0; TEST_LOOPING(lc); lc++) {
103
104 tst_count = 0;
105
106 /*
107 * Call readlink(2) to read the contents of
108 * symlink into a buffer.
109 */
110 TEST(readlink(SYMFILE, buffer, sizeof(buffer)));
111
112 if (TEST_RETURN == -1) {
113 tst_resm(TFAIL,
114 "readlink() on %s failed, errno=%d : %s",
115 SYMFILE, TEST_ERRNO, strerror(TEST_ERRNO));
116 continue;
117 }
118
119 /*
120 * Compare the return value of readlink()
121 * with the expected value which is the
122 * strlen() of testfile.
123 */
124 if (TEST_RETURN == exp_val) {
125 /* Check for the contents of buffer */
126 if (memcmp(buffer, TESTFILE, exp_val) != 0) {
127 tst_resm(TFAIL, "Pathname %s and buffer"
128 " contents %s differ",
129 TESTFILE, buffer);
130 } else {
131 tst_resm(TPASS, "readlink() "
132 "functionality on '%s' is "
133 "correct", SYMFILE);
134 }
135 } else {
136 tst_resm(TFAIL, "readlink() return value %ld "
137 "does't match, Expected %d",
138 TEST_RETURN, exp_val);
139 }
140 }
141
142 cleanup();
143 tst_exit();
144 }
145
146 /*
147 * setup() - performs all ONE TIME setup for this test.
148 *
149 * Create a temporary directory and change directory to it.
150 * Create a test file under temporary directory and close it
151 * Create a symbolic link of testfile.
152 */
setup(void)153 void setup(void)
154 {
155 int fd; /* file handle for testfile */
156
157 tst_require_root();
158
159 if ((ltpuser = getpwnam(nobody_uid)) == NULL) {
160 tst_brkm(TBROK, cleanup, "getpwname(nobody_uid) failed ");
161 }
162 SAFE_SETEUID(cleanup, ltpuser->pw_uid);
163
164 tst_sig(NOFORK, DEF_HANDLER, cleanup);
165
166 TEST_PAUSE;
167
168 tst_tmpdir();
169
170 if ((fd = open(TESTFILE, O_RDWR | O_CREAT, FILE_MODE)) == -1) {
171 tst_brkm(TBROK | TERRNO, cleanup,
172 "open(%s, O_RDWR|O_CREAT, %#o) failed",
173 TESTFILE, FILE_MODE);
174 }
175
176 if (close(fd) == -1) {
177 tst_resm(TWARN | TERRNO, "close(%s) failed", TESTFILE);
178 }
179
180 /* Create a symlink of testfile under temporary directory */
181 SAFE_SYMLINK(cleanup, TESTFILE, SYMFILE);
182 }
183
184 /*
185 * cleanup() - performs all ONE TIME cleanup for this test at
186 * completion or premature exit.
187 *
188 * Remove the test directory and testfile created in the setup.
189 */
cleanup(void)190 void cleanup(void)
191 {
192
193 tst_rmdir();
194
195 }
196