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: truncate02
22 *
23 * Test Description:
24 * Verify that, truncate(2) succeeds to truncate a file to a certain length,
25 * but the attempt to read past the truncated length will fail.$
26 *
27 * Expected Result:
28 * truncate(2) should return a value 0 and the attempt to read past the
29 * truncated length will fail. In case where the file before truncation was
30 * shorter, the bytes between the old and new should be all zeroes.
31 *
32 * Algorithm:
33 * Setup:
34 * Setup signal handling.
35 * Create temporary directory.
36 * Pause for SIGUSR1 if option specified.
37 *
38 * Test:
39 * Loop if the proper options are given.
40 * Execute system call
41 * Check return code, if system call failed (return=-1)
42 * Log the errno and Issue a FAIL message.
43 * Otherwise,
44 * Verify the Functionality of system call
45 * if successful,
46 * Issue Functionality-Pass message.
47 * Otherwise,
48 * Issue Functionality-Fail message.
49 * Cleanup:
50 * Print errno log and/or timing stats if options given
51 * Delete the temporary directory created.
52 *
53 * Usage: <for command-line>
54 * truncate02 [-c n] [-e] [-f] [-i n] [-I x] [-p x] [-t]
55 * where, -c n : Run n copies concurrently.
56 * -e : Turn on errno logging.
57 * -f : Turn off functionality Testing.
58 * -i n : Execute test n times.
59 * -I x : Execute test for x seconds.
60 * -P x : Pause for x seconds between iterations.
61 * -t : Turn on syscall timing.
62 *
63 * History
64 * 07/2001 John George
65 * -Ported
66 *
67 * Restrictions:
68 * This test should be run by 'non-super-user' only.
69 *
70 */
71
72 #include <sys/types.h>
73 #include <sys/stat.h>
74 #include <fcntl.h>
75 #include <errno.h>
76 #include <string.h>
77 #include <signal.h>
78
79 #include "test.h"
80
81 #define TESTFILE "testfile" /* file under test */
82 #define FILE_MODE S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
83 #define BUF_SIZE 256 /* buffer size */
84 #define FILE_SIZE 1024 /* test file size */
85 #define TRUNC_LEN1 256 /* truncation length */
86 #define TRUNC_LEN2 512 /* truncation length */
87
88 TCID_DEFINE(truncate02);
89 int TST_TOTAL = 1; /* Total number of test conditions */
90 int fd; /* file descriptor of testfile */
91 char tst_buff[BUF_SIZE]; /* buffer to hold testfile contents */
92
93 void setup(); /* setup function for the test */
94 void cleanup(); /* cleanup function for the test */
95
main(int ac,char ** av)96 int main(int ac, char **av)
97 {
98 struct stat stat_buf; /* stat(2) struct contents */
99 int lc, i;
100 off_t file_length2; /* test file length */
101 off_t file_length1; /* test file length */
102 int rbytes; /* bytes read from testfile */
103 int read_len; /* total no. of bytes read from testfile */
104 int err_flag = 0; /* error indicator flag */
105
106 tst_parse_opts(ac, av, NULL, NULL);
107
108 setup();
109
110 for (lc = 0; TEST_LOOPING(lc); lc++) {
111
112 tst_count = 0;
113 read_len = 0;
114
115 /*
116 * Call truncate(2) to truncate a test file to a
117 * specified length (TRUNC_LEN1).
118 */
119 TEST(truncate(TESTFILE, TRUNC_LEN1));
120
121 if (TEST_RETURN == -1) {
122 tst_resm(TFAIL,
123 "truncate(%s, %d) Failed, errno=%d : %s",
124 TESTFILE, TRUNC_LEN1, TEST_ERRNO,
125 strerror(TEST_ERRNO));
126 } else {
127 /*
128 * Get the testfile information using
129 * stat(2).
130 */
131 if (stat(TESTFILE, &stat_buf) < 0) {
132 tst_brkm(TFAIL, cleanup, "stat(2) of "
133 "%s failed after 1st truncate, "
134 "error:%d", TESTFILE, errno);
135 }
136 file_length1 = stat_buf.st_size;
137
138 /*
139 * Set the file pointer of testfile to the
140 * beginning of the file.
141 */
142 if (lseek(fd, 0, SEEK_SET) < 0) {
143 tst_brkm(TFAIL, cleanup, "lseek(2) on "
144 "%s failed after 1st truncate, "
145 "error:%d", TESTFILE, errno);
146 }
147
148 /* Read the testfile from the beginning. */
149 while ((rbytes = read(fd, tst_buff,
150 sizeof(tst_buff))) > 0) {
151 read_len += rbytes;
152 }
153
154 /*
155 * Execute truncate(2) again to truncate
156 * testfile to a size TRUNC_LEN2.
157 */
158 TEST(truncate(TESTFILE, TRUNC_LEN2));
159
160 if (TEST_RETURN == -1) {
161 tst_resm(TFAIL, "truncate of %s to "
162 "size %d Failed, errno=%d : %s",
163 TESTFILE, TRUNC_LEN2,
164 TEST_ERRNO,
165 strerror(TEST_ERRNO));
166 }
167
168 /*
169 * Get the testfile information using
170 * stat(2)
171 */
172 if (stat(TESTFILE, &stat_buf) < 0) {
173 tst_brkm(TFAIL, cleanup, "stat(2) of "
174 "%s failed after 2nd truncate, "
175 "error:%d", TESTFILE, errno);
176 }
177 file_length2 = stat_buf.st_size;
178
179 /*
180 * Set the file pointer of testfile to the
181 * offset TRUNC_LEN1 of testfile.
182 */
183 if (lseek(fd, TRUNC_LEN1, SEEK_SET) < 0) {
184 tst_brkm(TFAIL, cleanup, "lseek(2) on "
185 "%s failed after 2nd truncate, "
186 "error:%d", TESTFILE, errno);
187 }
188
189 /* Read the testfile contents till EOF */
190 while ((rbytes = read(fd, tst_buff,
191 sizeof(tst_buff))) > 0) {
192 for (i = 0; i < rbytes; i++) {
193 if (tst_buff[i] != 0) {
194 err_flag++;
195 }
196 }
197 }
198
199 /*
200 * Check for expected size of testfile after
201 * issuing truncate(2) on it.
202 */
203 if ((file_length1 != TRUNC_LEN1) ||
204 (file_length2 != TRUNC_LEN2) ||
205 (read_len != TRUNC_LEN1) ||
206 (err_flag != 0)) {
207 tst_resm(TFAIL, "Functionality of "
208 "truncate(2) on %s Failed",
209 TESTFILE);
210 } else {
211 tst_resm(TPASS,
212 "Functionality of truncate(2) "
213 "on %s successful", TESTFILE);
214 }
215 }
216 tst_count++; /* incr. TEST_LOOP counter */
217 }
218
219 cleanup();
220 tst_exit();
221 }
222
223 /*
224 * void
225 * setup() - performs all ONE TIME setup for this test.
226 * Create a temporary directory and change directory to it.
227 * Create a test file under temporary directory and write some
228 * data into it.
229 */
setup(void)230 void setup(void)
231 {
232 int i;
233 int wbytes; /* bytes written to testfile */
234 int write_len = 0; /* total no. of bytes written to testfile */
235
236 tst_sig(FORK, DEF_HANDLER, cleanup);
237
238 /* Pause if that option was specified
239 * TEST_PAUSE contains the code to fork the test with the -i option.
240 * You want to make sure you do this before you create your temporary
241 * directory.
242 */
243 TEST_PAUSE;
244
245 tst_tmpdir();
246
247 /* Fill the test buffer with the known data */
248 for (i = 0; i < BUF_SIZE; i++) {
249 tst_buff[i] = 'a';
250 }
251
252 /* Creat a testfile and write some data into it */
253 if ((fd = open(TESTFILE, O_RDWR | O_CREAT, FILE_MODE)) == -1) {
254 tst_brkm(TBROK, cleanup,
255 "open(%s, O_RDWR|O_CREAT, %o) Failed, errno=%d : %s",
256 TESTFILE, FILE_MODE, errno, strerror(errno));
257 }
258
259 /* Write to the file 1k data from the buffer */
260 while (write_len < FILE_SIZE) {
261 if ((wbytes = write(fd, tst_buff, sizeof(tst_buff))) <= 0) {
262 tst_brkm(TBROK, cleanup,
263 "write(2) on %s Failed, errno=%d : %s",
264 TESTFILE, errno, strerror(errno));
265 } else {
266 write_len += wbytes;
267 }
268 }
269 }
270
271 /*
272 * void
273 * cleanup() - performs all ONE TIME cleanup for this test at
274 * completion or premature exit.
275 * Close the temporary file opened for reading/writing.
276 * Remove the test directory and testfile created in the setup.
277 */
cleanup(void)278 void cleanup(void)
279 {
280
281 /* Close the testfile after writing data into it */
282 if (close(fd) == -1) {
283 tst_brkm(TFAIL, NULL,
284 "close(%s) Failed, errno=%d : %s",
285 TESTFILE, errno, strerror(errno));
286 }
287
288 tst_rmdir();
289
290 }
291