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
76 #define TESTFILE "testfile"
77 #define SYMFILE "slink_file"
78 #define FILE_MODE S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
79 #define MAX_SIZE 256
80
81 char *TCID = "readlink01";
82 int TST_TOTAL = 1;
83
84 const int exp_val = sizeof(TESTFILE) - 1; /* strlen of testfile */
85
86 void setup();
87 void cleanup();
88
89 char nobody_uid[] = "nobody";
90 struct passwd *ltpuser;
91
main(int ac,char ** av)92 int main(int ac, char **av)
93 {
94 char buffer[MAX_SIZE]; /* temporary buffer to hold symlink contents */
95 int lc;
96
97 tst_parse_opts(ac, av, NULL, NULL);
98
99 setup();
100
101 for (lc = 0; TEST_LOOPING(lc); lc++) {
102
103 tst_count = 0;
104
105 /*
106 * Call readlink(2) to read the contents of
107 * symlink into a buffer.
108 */
109 TEST(readlink(SYMFILE, buffer, sizeof(buffer)));
110
111 if (TEST_RETURN == -1) {
112 tst_resm(TFAIL,
113 "readlink() on %s failed, errno=%d : %s",
114 SYMFILE, TEST_ERRNO, strerror(TEST_ERRNO));
115 continue;
116 }
117
118 /*
119 * Compare the return value of readlink()
120 * with the expected value which is the
121 * strlen() of testfile.
122 */
123 if (TEST_RETURN == exp_val) {
124 /* Check for the contents of buffer */
125 if (memcmp(buffer, TESTFILE, exp_val) != 0) {
126 tst_resm(TFAIL, "Pathname %s and buffer"
127 " contents %s differ",
128 TESTFILE, buffer);
129 } else {
130 tst_resm(TPASS, "readlink() "
131 "functionality on '%s' is "
132 "correct", SYMFILE);
133 }
134 } else {
135 tst_resm(TFAIL, "readlink() return value %ld "
136 "does't match, Expected %d",
137 TEST_RETURN, exp_val);
138 }
139 }
140
141 cleanup();
142 tst_exit();
143 }
144
145 /*
146 * setup() - performs all ONE TIME setup for this test.
147 *
148 * Create a temporary directory and change directory to it.
149 * Create a test file under temporary directory and close it
150 * Create a symbolic link of testfile.
151 */
setup(void)152 void setup(void)
153 {
154 int fd; /* file handle for testfile */
155
156 tst_require_root();
157
158 if ((ltpuser = getpwnam(nobody_uid)) == NULL) {
159 tst_brkm(TBROK, cleanup, "getpwname(nobody_uid) failed ");
160 }
161 if (seteuid(ltpuser->pw_uid) == -1) {
162 tst_brkm(TBROK | TERRNO, cleanup, "seteuid to nobody failed");
163 }
164
165 tst_sig(NOFORK, DEF_HANDLER, cleanup);
166
167 TEST_PAUSE;
168
169 tst_tmpdir();
170
171 if ((fd = open(TESTFILE, O_RDWR | O_CREAT, FILE_MODE)) == -1) {
172 tst_brkm(TBROK | TERRNO, cleanup,
173 "open(%s, O_RDWR|O_CREAT, %#o) failed",
174 TESTFILE, FILE_MODE);
175 }
176
177 if (close(fd) == -1) {
178 tst_resm(TWARN | TERRNO, "close(%s) failed", TESTFILE);
179 }
180
181 /* Create a symlink of testfile under temporary directory */
182 if (symlink(TESTFILE, SYMFILE) < 0) {
183 tst_brkm(TBROK | TERRNO, cleanup, "symlink(%s, %s) failed",
184 TESTFILE, SYMFILE);
185 }
186 }
187
188 /*
189 * cleanup() - performs all ONE TIME cleanup for this test at
190 * completion or premature exit.
191 *
192 * Remove the test directory and testfile created in the setup.
193 */
cleanup(void)194 void cleanup(void)
195 {
196
197 tst_rmdir();
198
199 }
200