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 * write05.c
23 *
24 * DESCRIPTION
25 * Check the return value, and errnos of write(2)
26 * - when the file descriptor is invalid - EBADF
27 * - when the buf parameter is invalid - EFAULT
28 * - on an attempt to write to a pipe that is not open for reading - EPIPE
29 *
30 * ALGORITHM
31 * Attempt to write on a file with negative file descriptor, check for -1
32 * Attempt to write on a file with invalid buffer, check for -1
33 * Open a pipe and close the read end, attempt to write to the write
34 * end, check for -1.
35 *
36 * USAGE: <for command-line>
37 * write05 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
38 * where, -c n : Run n copies concurrently.
39 * -e : Turn on errno logging.
40 * -i n : Execute test n times.
41 * -I x : Execute test for x seconds.
42 * -P x : Pause for x seconds between iterations.
43 * -t : Turn on syscall timing.
44 *
45 * History
46 * 07/2001 John George
47 * -Ported
48 * 04/2002 wjhuie sigset cleanups
49 * 08/2007 Ricardo Salveti de Araujo <rsalveti@linux.vnet.ibm.com>
50 * - Closing the fd before removing the file
51 *
52 * Restrictions
53 * None
54 */
55 #include <sys/types.h>
56 #include <sys/stat.h>
57 #include <fcntl.h>
58 #include <errno.h>
59 #include <stdio.h>
60 #include <wait.h>
61 #include <sys/mman.h>
62 #include "test.h"
63
64 void setup(void);
65 void cleanup(void);
66
67 char *TCID = "write05";
68 int TST_TOTAL = 1;
69 char filename[100];
70 int fd;
71
72 char *bad_addr = 0;
73
main(int argc,char ** argv)74 int main(int argc, char **argv)
75 {
76 int lc;
77
78 char pbuf[BUFSIZ];
79 int pipefildes[2];
80 int status, pid;
81
82 tst_parse_opts(argc, argv, NULL, NULL);
83
84 /* global setup */
85 setup();
86
87 /* The following loop checks looping state if -i option given */
88 for (lc = 0; TEST_LOOPING(lc); lc++) {
89
90 /* reset tst_count in case we are looping */
91 tst_count = 0;
92
93 //block1:
94 tst_resm(TINFO, "Enter Block 1: test with bad fd");
95 if (write(-1, pbuf, 1) != -1) {
96 tst_resm(TFAIL, "write of invalid fd passed");
97 } else {
98 if (errno != EBADF) {
99 tst_resm(TFAIL, "expected EBADF got %d", errno);
100 }
101 tst_resm(TPASS, "received EBADF as expected.");
102 }
103 tst_resm(TINFO, "Exit Block 1");
104
105 //block2:
106 tst_resm(TINFO, "Enter Block 2: test with a bad address");
107 fd = creat(filename, 0644);
108 if (fd < 0) {
109 tst_resm(TFAIL, "creating a new file failed");
110 cleanup();
111 }
112 if (write(fd, bad_addr, 10) != -1) {
113 tst_resm(TFAIL, "write() on an invalid buffer "
114 "succeeded, but should have failed");
115 cleanup();
116 } else {
117 if (errno != EFAULT) {
118 tst_resm(TFAIL, "write() returned illegal "
119 "errno: expected EFAULT, got %d",
120 errno);
121 cleanup();
122 }
123 tst_resm(TPASS, "received EFAULT as expected.");
124 }
125 tst_resm(TINFO, "Exit Block 2");
126
127 //block3:
128 tst_resm(TINFO, "Enter Block 3: test with invalid pipe");
129 if ((pid = FORK_OR_VFORK()) == 0) { /* child */
130 if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
131 tst_resm(TINFO, "signal failed");
132 }
133 if (pipe(pipefildes) == -1) {
134 tst_brkm(TBROK, NULL, "can't open pipe");
135 exit(errno);
136 }
137 close(pipefildes[0]);
138 if (write(pipefildes[1], pbuf, 1) != -1) {
139 tst_resm(TFAIL, "write on read-closed"
140 "pipe succeeded");
141 exit(-1);
142 } else {
143 if (errno != EPIPE) {
144 tst_resm(TFAIL, "write() failed to set"
145 " errno to EPIPE, got: %d",
146 errno);
147 exit(errno);
148 }
149 exit(0);
150 }
151 } else {
152 if (pid < 0) {
153 tst_resm(TFAIL, "Fork failed");
154 }
155 wait(&status);
156 if (WIFSIGNALED(status) &&
157 WTERMSIG(status) == SIGPIPE) {
158 tst_resm(TFAIL, "child set SIGPIPE in exit");
159 } else if (WEXITSTATUS(status) != 0) {
160 tst_resm(TFAIL, "exit status from child "
161 "expected 0 got %d", status >> 8);
162 } else {
163 tst_resm(TPASS, "received EPIPE as expected.");
164 }
165 tst_resm(TINFO, "Exit Block 3");
166 }
167 close(fd);
168 }
169 cleanup();
170 tst_exit();
171 }
172
173 /*
174 * setup()
175 * performs all ONE TIME setup for this test
176 */
setup(void)177 void setup(void)
178 {
179
180 tst_sig(FORK, DEF_HANDLER, cleanup);
181
182 /* Pause if that option was specified
183 * TEST_PAUSE contains the code to fork the test with the -i option.
184 * You want to make sure you do this before you create your temporary
185 * directory.
186 */
187 TEST_PAUSE;
188
189 /* Create a unique temporary directory and chdir() to it. */
190 tst_tmpdir();
191
192 sprintf(filename, "write05.%d", getpid());
193
194 bad_addr = mmap(0, 1, PROT_NONE,
195 MAP_PRIVATE_EXCEPT_UCLINUX | MAP_ANONYMOUS, 0, 0);
196 if (bad_addr == MAP_FAILED) {
197 printf("mmap failed\n");
198 }
199
200 }
201
202 /*
203 * cleanup()
204 * performs all ONE TIME cleanup for this test at
205 * completion or premature exit
206 */
cleanup(void)207 void cleanup(void)
208 {
209
210 /* Close the file descriptor befor removing the file */
211 close(fd);
212
213 unlink(filename);
214 tst_rmdir();
215
216 }
217