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: lseek08
22 *
23 * Test Description:
24 * Verify that, lseek() call succeeds to set the file pointer position
25 * to the end of the file when 'whence' value set to SEEK_END and any
26 * attempts to read from that position should fail.
27 *
28 * Expected Result:
29 * lseek() should return the offset which is set to the file size measured
30 * in bytes. read() attempt should fail with -1 return value.
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 * lseek08 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
55 * where, -c n : Run n copies concurrently.
56 * -f : Turn off functionality Testing.
57 * -i n : Execute test n times.
58 * -I x : Execute test for x seconds.
59 * -P x : Pause for x seconds between iterations.
60 * -t : Turn on syscall timing.
61 *
62 * HISTORY
63 * 07/2001 Ported by Wayne Boyer
64 *
65 * RESTRICTIONS:
66 * None.
67 */
68
69 #include <stdio.h>
70 #include <unistd.h>
71 #include <sys/types.h>
72 #include <errno.h>
73 #include <fcntl.h>
74 #include <utime.h>
75 #include <string.h>
76 #include <sys/stat.h>
77 #include <signal.h>
78
79 #include "test.h"
80
81 #define TEMP_FILE "tmp_file"
82 #define FILE_MODE S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
83
84 char *TCID = "lseek08";
85 int TST_TOTAL = 1;
86 int fildes; /* file handle for temp file */
87 size_t file_size; /* size of the temporary file */
88
89 void setup(); /* Main setup function of test */
90 void cleanup(); /* cleanup function for the test */
91
main(int ac,char ** av)92 int main(int ac, char **av)
93 {
94 int lc;
95 char read_buf[1]; /* data read from temp. file */
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 * Invoke lseek(2) to move the read/write file
107 * pointer/handle to the END of the file.
108 */
109 TEST(lseek(fildes, 0, SEEK_END));
110
111 if (TEST_RETURN == -1) {
112 tst_resm(TFAIL | TTERRNO,
113 "lseek of %s failed", TEMP_FILE);
114 continue;
115 }
116 /*
117 * Check if the return value from lseek(2)
118 * is equal to the file_size.
119 */
120 if (TEST_RETURN != file_size) {
121 tst_resm(TFAIL, "lseek() returned incorrect "
122 "value %ld, expected %zu",
123 TEST_RETURN, file_size);
124 continue;
125 }
126 /*
127 * The return value is okay, now attempt to read data
128 * from the file. This should fail as the file pointer
129 * should be pointing to END OF FILE.
130 */
131 read_buf[0] = '\0';
132 if (read(fildes, &read_buf, sizeof(read_buf)) > 0) {
133 tst_resm(TFAIL, "read() successful on %s",
134 TEMP_FILE);
135 } else {
136 tst_resm(TPASS, "Functionality of lseek() on "
137 "%s successful", TEMP_FILE);
138 }
139 }
140
141 cleanup();
142 tst_exit();
143 }
144
145 /*
146 * setup() - performs all ONE TIME setup for this test.
147 * Create a temporary directory and change directory to it.
148 * Create a test file under temporary directory and write some
149 * data into it.
150 * Get the size of the file using fstat().
151 */
setup(void)152 void setup(void)
153 {
154 struct stat stat_buf; /* struct. buffer for stat(2) */
155 char write_buf[BUFSIZ]; /* buffer to hold data */
156
157 tst_sig(NOFORK, DEF_HANDLER, cleanup);
158
159 TEST_PAUSE;
160
161 tst_tmpdir();
162
163 /* Get the data to be written to temporary file */
164 strcpy(write_buf, "abcdefg\n");
165
166 /* Creat/open a temporary file under above directory */
167 if ((fildes = open(TEMP_FILE, O_RDWR | O_CREAT, FILE_MODE)) == -1) {
168 tst_brkm(TBROK | TERRNO, cleanup,
169 "open(%s, O_RDWR|O_CREAT, %#o) failed",
170 TEMP_FILE, FILE_MODE);
171 }
172
173 /* Write data into temporary file */
174 if (write(fildes, write_buf, strlen(write_buf)) <= 0) {
175 tst_brkm(TBROK | TERRNO, cleanup,
176 "writing to %s failed", TEMP_FILE);
177 }
178
179 /* Get the size of the file using fstat */
180 if (fstat(fildes, &stat_buf) < 0) {
181 tst_brkm(TBROK | TERRNO, cleanup,
182 "fstat of %s failed", TEMP_FILE);
183 }
184
185 file_size = stat_buf.st_size;
186 }
187
188 /*
189 * cleanup() - performs all ONE TIME cleanup for this test at
190 * completion or premature exit.
191 * Remove the test directory and testfile created in the setup.
192 */
cleanup(void)193 void cleanup(void)
194 {
195
196 /* Close the temporary file created */
197 if (close(fildes) < 0) {
198 tst_brkm(TFAIL, NULL,
199 "close(%s) Failed, errno=%d : %s:",
200 TEMP_FILE, errno, strerror(errno));
201 }
202
203 tst_rmdir();
204
205 }
206