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 <sys/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 = 0; /* 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
114 /*
115 * Call truncate(2) to truncate a test file to a
116 * specified length (TRUNC_LEN1).
117 */
118 TEST(truncate(TESTFILE, TRUNC_LEN1));
119
120 if (TEST_RETURN == -1) {
121 tst_resm(TFAIL,
122 "truncate(%s, %d) Failed, errno=%d : %s",
123 TESTFILE, TRUNC_LEN1, TEST_ERRNO,
124 strerror(TEST_ERRNO));
125 } else {
126 /*
127 * Get the testfile information using
128 * stat(2).
129 */
130 if (stat(TESTFILE, &stat_buf) < 0) {
131 tst_brkm(TFAIL, cleanup, "stat(2) of "
132 "%s failed after 1st truncate, "
133 "error:%d", TESTFILE, errno);
134 }
135 file_length1 = stat_buf.st_size;
136
137 /*
138 * Set the file pointer of testfile to the
139 * beginning of the file.
140 */
141 if (lseek(fd, 0, SEEK_SET) < 0) {
142 tst_brkm(TFAIL, cleanup, "lseek(2) on "
143 "%s failed after 1st truncate, "
144 "error:%d", TESTFILE, errno);
145 }
146
147 /* Read the testfile from the beginning. */
148 while ((rbytes = read(fd, tst_buff,
149 sizeof(tst_buff))) > 0) {
150 read_len += rbytes;
151 }
152
153 /*
154 * Execute truncate(2) again to truncate
155 * testfile to a size TRUNC_LEN2.
156 */
157 TEST(truncate(TESTFILE, TRUNC_LEN2));
158
159 if (TEST_RETURN == -1) {
160 tst_resm(TFAIL, "truncate of %s to "
161 "size %d Failed, errno=%d : %s",
162 TESTFILE, TRUNC_LEN2,
163 TEST_ERRNO,
164 strerror(TEST_ERRNO));
165 }
166
167 /*
168 * Get the testfile information using
169 * stat(2)
170 */
171 if (stat(TESTFILE, &stat_buf) < 0) {
172 tst_brkm(TFAIL, cleanup, "stat(2) of "
173 "%s failed after 2nd truncate, "
174 "error:%d", TESTFILE, errno);
175 }
176 file_length2 = stat_buf.st_size;
177
178 /*
179 * Set the file pointer of testfile to the
180 * offset TRUNC_LEN1 of testfile.
181 */
182 if (lseek(fd, TRUNC_LEN1, SEEK_SET) < 0) {
183 tst_brkm(TFAIL, cleanup, "lseek(2) on "
184 "%s failed after 2nd truncate, "
185 "error:%d", TESTFILE, errno);
186 }
187
188 /* Read the testfile contents till EOF */
189 while ((rbytes = read(fd, tst_buff,
190 sizeof(tst_buff))) > 0) {
191 for (i = 0; i < rbytes; i++) {
192 if (tst_buff[i] != 0) {
193 err_flag++;
194 }
195 }
196 }
197
198 /*
199 * Check for expected size of testfile after
200 * issuing truncate(2) on it.
201 */
202 if ((file_length1 != TRUNC_LEN1) ||
203 (file_length2 != TRUNC_LEN2) ||
204 (read_len != TRUNC_LEN1) ||
205 (err_flag != 0)) {
206 tst_resm(TFAIL, "Functionality of "
207 "truncate(2) on %s Failed",
208 TESTFILE);
209 } else {
210 tst_resm(TPASS,
211 "Functionality of truncate(2) "
212 "on %s successful", TESTFILE);
213 }
214 }
215 tst_count++; /* incr. TEST_LOOP counter */
216 }
217
218 cleanup();
219 tst_exit();
220 }
221
222 /*
223 * void
224 * setup() - performs all ONE TIME setup for this test.
225 * Create a temporary directory and change directory to it.
226 * Create a test file under temporary directory and write some
227 * data into it.
228 */
setup(void)229 void setup(void)
230 {
231 int i;
232 int wbytes; /* bytes written to testfile */
233 int write_len = 0; /* total no. of bytes written to testfile */
234
235 tst_sig(FORK, DEF_HANDLER, cleanup);
236
237 /* Pause if that option was specified
238 * TEST_PAUSE contains the code to fork the test with the -i option.
239 * You want to make sure you do this before you create your temporary
240 * directory.
241 */
242 TEST_PAUSE;
243
244 tst_tmpdir();
245
246 /* Fill the test buffer with the known data */
247 for (i = 0; i < BUF_SIZE; i++) {
248 tst_buff[i] = 'a';
249 }
250
251 /* Creat a testfile and write some data into it */
252 if ((fd = open(TESTFILE, O_RDWR | O_CREAT, FILE_MODE)) == -1) {
253 tst_brkm(TBROK, cleanup,
254 "open(%s, O_RDWR|O_CREAT, %o) Failed, errno=%d : %s",
255 TESTFILE, FILE_MODE, errno, strerror(errno));
256 }
257
258 /* Write to the file 1k data from the buffer */
259 while (write_len < FILE_SIZE) {
260 if ((wbytes = write(fd, tst_buff, sizeof(tst_buff))) <= 0) {
261 tst_brkm(TBROK, cleanup,
262 "write(2) on %s Failed, errno=%d : %s",
263 TESTFILE, errno, strerror(errno));
264 } else {
265 write_len += wbytes;
266 }
267 }
268 }
269
270 /*
271 * void
272 * cleanup() - performs all ONE TIME cleanup for this test at
273 * completion or premature exit.
274 * Close the temporary file opened for reading/writing.
275 * Remove the test directory and testfile created in the setup.
276 */
cleanup(void)277 void cleanup(void)
278 {
279
280 /* Close the testfile after writing data into it */
281 if (close(fd) == -1) {
282 tst_brkm(TFAIL, NULL,
283 "close(%s) Failed, errno=%d : %s",
284 TESTFILE, errno, strerror(errno));
285 }
286
287 tst_rmdir();
288
289 }
290