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 * msgsnd06.c
23 *
24 * DESCRIPTION
25 * msgsnd06 - test for EIDRM error
26 *
27 * ALGORITHM
28 * loop if that option was specified
29 * create a message queue with read/write permissions
30 * initialize a message buffer with a known message and type
31 * enqueue messages in a loop until the queue is full
32 * fork a child process
33 * child attempts to enqueue a message to the full queue and sleeps
34 * parent removes the queue and then exits
35 * child get a return from msgsnd()
36 * check the errno value
37 * issue a PASS message if we get EIDRM
38 * otherwise, the tests fails
39 * issue a FAIL message
40 * call cleanup
41 *
42 * USAGE: <for command-line>
43 * msgsnd06 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
44 * where, -c n : Run n copies concurrently.
45 * -e : Turn on errno logging.
46 * -i n : Execute test n times.
47 * -I x : Execute test for x seconds.
48 * -P x : Pause for x seconds between iterations.
49 * -t : Turn on syscall timing.
50 *
51 * HISTORY
52 * 03/2001 - Written by Wayne Boyer
53 * 14/03/2008 Matthieu Fertré (Matthieu.Fertre@irisa.fr)
54 * - Fix concurrency issue. Due to the use of usleep function to
55 * synchronize processes, synchronization issues can occur on a loaded
56 * system. Fix this by using pipes to synchronize processes.
57 *
58 * RESTRICTIONS
59 * none
60 */
61
62 #include <sys/wait.h>
63 #include "test.h"
64
65 #include "ipcmsg.h"
66
67 void cleanup(void);
68 void setup(void);
69 void do_child(void);
70
71 char *TCID = "msgsnd06";
72 int TST_TOTAL = 1;
73
74 int msg_q_1 = -1; /* The message queue id created in setup */
75
76 MSGBUF msg_buf;
77
main(int ac,char ** av)78 int main(int ac, char **av)
79 {
80 int lc;
81 pid_t c_pid;
82 int status, e_code;
83
84 tst_parse_opts(ac, av, NULL, NULL);
85
86 #ifdef UCLINUX
87 #define PIPE_NAME "msgsnd06"
88 maybe_run_child(&do_child, "d", &msg_q_1);
89 #endif
90
91 setup(); /* global setup */
92
93 /* The following loop checks looping state if -i option given */
94
95 for (lc = 0; TEST_LOOPING(lc); lc++) {
96 /* reset tst_count in case we are looping */
97 tst_count = 0;
98
99 msgkey = getipckey();
100
101 /* create a message queue with read/write permission */
102 if ((msg_q_1 = msgget(msgkey, IPC_CREAT | IPC_EXCL | MSG_RW))
103 == -1) {
104 tst_brkm(TBROK, cleanup, "Can't create message queue");
105 }
106
107 /* initialize the message buffer */
108 init_buf(&msg_buf, MSGTYPE, MSGSIZE);
109
110 /* write messages to the queue until it is full */
111 while (msgsnd(msg_q_1, &msg_buf, MSGSIZE, IPC_NOWAIT) != -1) {
112 msg_buf.mtype += 1;
113 }
114
115 /*
116 * fork a child that will attempt to write a message
117 * to the queue without IPC_NOWAIT
118 */
119 if ((c_pid = FORK_OR_VFORK()) == -1) {
120 tst_brkm(TBROK, cleanup, "could not fork");
121 }
122
123 if (c_pid == 0) { /* child */
124
125 #ifdef UCLINUX
126 if (self_exec(av[0], "d", msg_q_1) < 0) {
127 tst_brkm(TBROK, cleanup, "could not self_exec");
128 }
129 #else
130 do_child();
131 #endif
132 } else {
133 TST_PROCESS_STATE_WAIT(cleanup, c_pid, 'S');
134
135 /* remove the queue */
136 rm_queue(msg_q_1);
137
138 /* wait for the child to finish */
139 wait(&status);
140 /* make sure the child returned a good exit status */
141 e_code = status >> 8;
142 if (e_code != 0) {
143 tst_resm(TFAIL, "Failures reported above");
144 }
145 }
146 }
147
148 cleanup();
149
150 tst_exit();
151 }
152
153 /*
154 * do_child()
155 */
do_child(void)156 void do_child(void)
157 {
158 int retval = 0;
159
160 #ifdef UCLINUX
161 /* initialize the message buffer */
162 init_buf(&msg_buf, MSGTYPE, MSGSIZE);
163
164 #endif
165 /*
166 * Attempt to write another message to the full queue.
167 * Without the IPC_NOWAIT flag, the child sleeps
168 */
169 TEST(msgsnd(msg_q_1, &msg_buf, MSGSIZE, 0));
170
171 if (TEST_RETURN != -1) {
172 retval = 1;
173 tst_resm(TFAIL, "call succeeded when error expected");
174 exit(retval);
175 }
176
177 switch (TEST_ERRNO) {
178 case EIDRM:
179 tst_resm(TPASS, "expected failure - errno = %d : %s",
180 TEST_ERRNO, strerror(TEST_ERRNO));
181
182 /* mark the queue as invalid as it was removed */
183 msg_q_1 = -1;
184 break;
185 default:
186 retval = 1;
187 tst_resm(TFAIL,
188 "call failed with an unexpected error - %d : %s",
189 TEST_ERRNO, strerror(TEST_ERRNO));
190 break;
191 }
192 exit(retval);
193 }
194
195 /*
196 * setup() - performs all the ONE TIME setup for this test.
197 */
setup(void)198 void setup(void)
199 {
200
201 tst_sig(FORK, DEF_HANDLER, cleanup);
202
203 TEST_PAUSE;
204
205 /*
206 * Create a temporary directory and cd into it.
207 * This helps to ensure that a unique msgkey is created.
208 * See ../lib/libipc.c for more information.
209 */
210 tst_tmpdir();
211 }
212
213 /*
214 * cleanup() - performs all the ONE TIME cleanup for this test at completion
215 * or premature exit.
216 */
cleanup(void)217 void cleanup(void)
218 {
219
220 tst_rmdir();
221
222 }
223