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: pread02
22 *
23 * Test Description:
24 * Verify that,
25 * 1) pread() fails when attempted to read from an unnamed pipe.
26 * 2) pread() fails if the specified offset position was invalid.
27 *
28 * Expected Result:
29 * 1) pread() should return -1 and set errno to ESPIPE.
30 * 2) pread() should return -1 and set errno to EINVAL.
31 *
32 * Algorithm:
33 * Setup:
34 * Setup signal handling.
35 * Create a 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 * if errno set == expected errno
43 * Issue sys call fails with expected return value and errno.
44 * Otherwise,
45 * Issue sys call fails with unexpected errno.
46 * Otherwise,
47 * Issue sys call returns unexpected value.
48 *
49 * Cleanup:
50 * Print errno log and/or timing stats if options given
51 * Delete the temporary directory(s)/file(s) created.
52 *
53 * Usage: <for command-line>
54 * pread02 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
55 * where, -c n : Run n copies concurrently.
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 * None.
66 */
67
68 #define _XOPEN_SOURCE 500
69
70 #include <errno.h>
71 #include <unistd.h>
72 #include <fcntl.h>
73
74 #include "test.h"
75
76 #define TEMPFILE "pread_file"
77 #define K1 1024
78 #define NBUFS 4
79
80 char *TCID = "pread02";
81 int TST_TOTAL = 2;
82
83 char *write_buf[NBUFS]; /* buffer to hold data to be written */
84 char *read_buf[NBUFS]; /* buffer to hold data read from file */
85 int pfd[2]; /* pair of file descriptors */
86 int fd1;
87
88 void setup(); /* Main setup function of test */
89 void cleanup(); /* cleanup function for the test */
90 int setup1(); /* setup function for test #1 */
91 int setup2(); /* setup function for test #2 */
92 int no_setup();
93 void init_buffers(); /* function to initialize/allocate buffers */
94
95 struct test_case_t { /* test case struct. to hold ref. test cond's */
96 int fd;
97 size_t nb;
98 off_t offst;
99 char *desc;
100 int exp_errno;
101 int (*setupfunc) ();
102 } Test_cases[] = {
103 {
104 1, K1, 0, "file descriptor is a PIPE or FIFO", ESPIPE, setup1}, {
105 2, K1, -1, "specified offset is -ve or invalid", EINVAL, setup2}, {
106 0, 0, 0, NULL, 0, no_setup}
107 };
108
main(int ac,char ** av)109 int main(int ac, char **av)
110 {
111 int lc;
112 int i;
113 int fildes; /* file descriptor of test file */
114 size_t nbytes; /* no. of bytes to be written */
115 off_t offset; /* offset position in the specified file */
116 char *test_desc; /* test specific error message */
117
118 tst_parse_opts(ac, av, NULL, NULL);
119
120 setup();
121
122 for (lc = 0; TEST_LOOPING(lc); lc++) {
123
124 tst_count = 0;
125
126 /* loop through the test cases */
127 for (i = 0; Test_cases[i].desc != NULL; i++) {
128 fildes = Test_cases[i].fd;
129 test_desc = Test_cases[i].desc;
130 nbytes = Test_cases[i].nb;
131 offset = Test_cases[i].offst;
132
133 if (fildes == 1) {
134 fildes = pfd[0];
135 } else if (fildes == 2) {
136 fildes = fd1;
137 }
138
139 /*
140 * Call pread() with the specified file descriptor,
141 * no. of bytes to be read from specified offset.
142 * and verify that call should fail with appropriate
143 * errno set.
144 */
145 TEST(pread(fildes, read_buf[0], nbytes, offset));
146
147 /* Check for the return code of pread() */
148 if (TEST_RETURN != -1) {
149 tst_brkm(TFAIL, cleanup, "pread() returned "
150 "%ld, expected -1, errno:%d",
151 TEST_RETURN, Test_cases[i].exp_errno);
152 }
153
154 /*
155 * Verify whether expected errno is set.
156 */
157 if (TEST_ERRNO == Test_cases[i].exp_errno) {
158 tst_resm(TPASS, "pread() fails, %s, errno:%d",
159 test_desc, TEST_ERRNO);
160 } else {
161 tst_resm(TFAIL, "pread() fails, %s, unexpected "
162 "errno:%d, expected:%d", test_desc,
163 TEST_ERRNO, Test_cases[i].exp_errno);
164 }
165 }
166 }
167
168 cleanup();
169
170 tst_exit();
171 }
172
173 /*
174 * setup() - performs all ONE TIME setup for this test.
175 * Initialize/allocate write buffer.
176 * Call individual setup function.
177 */
setup(void)178 void setup(void)
179 {
180 int i;
181
182 tst_sig(FORK, DEF_HANDLER, cleanup);
183
184 TEST_PAUSE;
185
186 /* Allocate/Initialize the read/write buffer with known data */
187 init_buffers();
188
189 /* Call individual setup functions */
190 for (i = 0; Test_cases[i].desc != NULL; i++) {
191 Test_cases[i].setupfunc();
192 }
193 }
194
195 /*
196 * no_setup() - This function simply returns.
197 */
no_setup(void)198 int no_setup(void)
199 {
200 return 0;
201 }
202
203 /*
204 * setup1() - setup function for a test condition for which pread()
205 * returns -ve value and sets errno to ESPIPE.
206 *
207 * Create an unnamed pipe using pipe().
208 * Write some known data to the write end of the pipe.
209 * return 0.
210 */
setup1(void)211 int setup1(void)
212 {
213 /* Create a pair of unnamed pipe */
214 if (pipe(pfd) < 0) {
215 tst_brkm(TBROK, cleanup, "pipe() failed to create pair of "
216 "pipe, error:%d", errno);
217 }
218
219 /* Write known data (0's) of K1 bytes */
220 if (write(pfd[1], write_buf[0], K1) != K1) {
221 tst_brkm(TBROK, cleanup, "write to pipe failed: errno=%d : %s",
222 errno, strerror(errno));
223 }
224
225 return 0;
226 }
227
228 /*
229 * setup2 - setup function for a test condition for which pread()
230 * returns -ve value and sets errno to EINVAL.
231 *
232 * Create a temporary directory and a file under it.
233 * return 0.
234 */
setup2(void)235 int setup2(void)
236 {
237
238 tst_tmpdir();
239
240 /* Creat a temporary file used for mapping */
241 if ((fd1 = open(TEMPFILE, O_RDWR | O_CREAT, 0666)) < 0) {
242 tst_brkm(TBROK, cleanup, "open() on %s Failed, errno=%d : %s",
243 TEMPFILE, errno, strerror(errno));
244 }
245
246 return 0;
247 }
248
249 /*
250 * init_buffers() - allocate/Initialize write_buf array.
251 *
252 * Allocate read/write buffer.
253 * Fill the write buffer with the following data like,
254 * write_buf[0] has 0's, write_buf[1] has 1's, write_buf[2] has 2's
255 * write_buf[3] has 3's.
256 */
init_buffers(void)257 void init_buffers(void)
258 {
259 int count; /* counter variable for loop */
260
261 /* Allocate and Initialize write buffer with known data */
262 for (count = 0; count < NBUFS; count++) {
263 write_buf[count] = malloc(K1);
264 read_buf[count] = malloc(K1);
265
266 if ((write_buf[count] == NULL) || (read_buf[count] == NULL)) {
267 tst_brkm(TBROK, NULL,
268 "malloc() failed on read/write buffers");
269 }
270 memset(write_buf[count], count, K1);
271 }
272 }
273
274 /*
275 * cleanup() - performs all ONE TIME cleanup for this test at
276 * completion or premature exit.
277 *
278 * Deallocate the memory allocated to read/write buffers.
279 * Close the temporary file.
280 * Remove the temporary directory created.
281 */
cleanup(void)282 void cleanup(void)
283 {
284 int count;
285
286 /* Free the memory allocated for the read/write buffer */
287 for (count = 0; count < NBUFS; count++) {
288 free(write_buf[count]);
289 free(read_buf[count]);
290 }
291
292 /* Close the temporary file created in setup2 */
293 if (close(fd1) < 0) {
294 tst_brkm(TBROK, NULL, "close() on %s Failed, errno=%d : %s",
295 TEMPFILE, errno, strerror(errno));
296 }
297
298 tst_rmdir();
299
300 }
301