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 * NAME
22 * write03.c
23 *
24 * DESCRIPTION
25 * Testcase to check that write(2) doesn't corrupt a file when it fails
26 *
27 * ALGORITHM
28 * Create a file for writing, write 100 bytes to it. Then make write(2)
29 * fail with some erroneous parameter, close the fd. Then reopen the
30 * file in RDONLY mode, and read the contents of the file. Compare the
31 * buffers, to see whether they are same.
32 *
33 * USAGE: <for command-line>
34 * write03 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
35 * where, -c n : Run n copies concurrently.
36 * -e : Turn on errno logging.
37 * -i n : Execute test n times.
38 * -I x : Execute test for x seconds.
39 * -P x : Pause for x seconds between iterations.
40 * -t : Turn on syscall timing.
41 *
42 * History
43 * 07/2001 John George
44 * -Ported
45 *
46 * Restrictions
47 * NONE
48 */
49
50 #include <unistd.h>
51 #include <string.h>
52 #include <fcntl.h>
53 #include <errno.h>
54 #include "test.h"
55 #include <sys/mman.h>
56
57 char *TCID = "write03";
58 int TST_TOTAL = 1;
59
60 char *bad_addr = 0;
61
62 void setup(void);
63 void cleanup(void);
64
65 char filename[100];
66
67 #if !defined(UCLINUX)
68
main(int argc,char ** argv)69 int main(int argc, char **argv)
70 {
71 int lc;
72
73 char wbuf[BUFSIZ], rbuf[BUFSIZ];
74 int fd;
75
76 tst_parse_opts(argc, argv, NULL, NULL);
77
78 /* global setup */
79 setup();
80
81 /* The following loop checks looping state if -i option given */
82 for (lc = 0; TEST_LOOPING(lc); lc++) {
83
84 /* reset tst_count in case we are looping */
85 tst_count = 0;
86
87 //block1:
88 tst_resm(TINFO, "Enter Block 1: test to check if write "
89 "corrupts the file when write fails");
90
91 fd = creat(filename, 0644);
92 if (fd < 0) {
93 tst_resm(TBROK, "creating a new file failed");
94 cleanup();
95 }
96
97 (void)memset(wbuf, '0', 100);
98
99 if (write(fd, wbuf, 100) == -1) {
100 tst_resm(TFAIL, "failed to write to %s", filename);
101 cleanup();
102 }
103
104 if (write(fd, bad_addr, 100) != -1) {
105 tst_resm(TFAIL, "write(2) failed to fail");
106 cleanup();
107 }
108 close(fd);
109
110 if ((fd = open(filename, O_RDONLY)) == -1) {
111 tst_resm(TBROK, "open(2) failed, errno: %d", errno);
112 cleanup();
113 }
114
115 if (read(fd, rbuf, 100) == -1) {
116 tst_resm(TBROK, "read(2) failed, errno: %d", errno);
117 cleanup();
118 }
119
120 if (memcmp(wbuf, rbuf, 100) == 0) {
121 tst_resm(TPASS, "failure of write(2) didnot corrupt "
122 "the file");
123 } else {
124 tst_resm(TFAIL, "failure of write(2) corrupted the "
125 "file");
126 }
127 tst_resm(TINFO, "Exit block 1");
128 close(fd);
129 }
130 cleanup();
131 tst_exit();
132 }
133
134 #else
135
main(void)136 int main(void)
137 {
138 tst_resm(TINFO, "test is not available on uClinux");
139 tst_exit();
140 }
141
142 #endif /* if !defined(UCLINUX) */
143
144 /*
145 * setup() - performs all ONE TIME setup for this test
146 */
setup(void)147 void setup(void)
148 {
149
150 tst_sig(FORK, DEF_HANDLER, cleanup);
151
152 /* Pause if that option was specified
153 * TEST_PAUSE contains the code to fork the test with the -i option.
154 * You want to make sure you do this before you create your temporary
155 * directory.
156 */
157 TEST_PAUSE;
158
159 /* Create a unique temporary directory and chdir() to it. */
160 tst_tmpdir();
161
162 sprintf(filename, "./write03.%d", getpid());
163
164 bad_addr = mmap(0, 1, PROT_NONE,
165 MAP_PRIVATE_EXCEPT_UCLINUX | MAP_ANONYMOUS, 0, 0);
166 if (bad_addr == MAP_FAILED) {
167 printf("mmap failed\n");
168 }
169
170 }
171
172 /*
173 * cleanup() - performs all ONE TIME cleanup for this test at
174 * completion or premature exit
175 */
cleanup(void)176 void cleanup(void)
177 {
178
179 unlink(filename);
180 tst_rmdir();
181
182 }
183