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 * msgrcv05.c
23 *
24 * DESCRIPTION
25 * msgrcv05 - test for EINTR error
26 *
27 * ALGORITHM
28 * create a message queue with read/write permissions
29 * loop if that option was specified
30 * fork a child who attempts to read a non-existent message with msgrcv()
31 * parent sends a SIGHUP to the child, then waits for the child to complete
32 * check the errno value
33 * issue a PASS message if we get EINTR
34 * otherwise, the tests fails
35 * issue a FAIL message
36 * child exits, parent calls cleanup
37 *
38 * USAGE: <for command-line>
39 * msgrcv05 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
40 * where, -c n : Run n copies concurrently.
41 * -e : Turn on errno logging.
42 * -i n : Execute test n times.
43 * -I x : Execute test for x seconds.
44 * -P x : Pause for x seconds between iterations.
45 * -t : Turn on syscall timing.
46 *
47 * HISTORY
48 * 03/2001 - Written by Wayne Boyer
49 * 14/03/2008 Matthieu Fertré (Matthieu.Fertre@irisa.fr)
50 * - Fix concurrency issue. Due to the use of usleep function to
51 * synchronize processes, synchronization issues can occur on a loaded
52 * system. Fix this by using pipes to synchronize processes.
53 *
54 * RESTRICTIONS
55 * none
56 */
57
58 #include "test.h"
59
60 #include "ipcmsg.h"
61
62 #include <sys/types.h>
63 #include <sys/wait.h>
64
65 void do_child(void);
66 void cleanup(void);
67 void setup(void);
68 #ifdef UCLINUX
69 #define PIPE_NAME "msgrcv05"
70 void do_child_uclinux(void);
71 #endif
72
73 char *TCID = "msgrcv05";
74 int TST_TOTAL = 1;
75
76 int msg_q_1 = -1; /* The message queue id created in setup */
77
78 MSGBUF rcv_buf;
79 pid_t c_pid;
80
main(int ac,char ** av)81 int main(int ac, char **av)
82 {
83 int lc;
84
85 tst_parse_opts(ac, av, NULL, NULL);
86
87 #ifdef UCLINUX
88 maybe_run_child(&do_child_uclinux, "d", &msg_q_1);
89 #endif
90
91 setup(); /* global setup */
92
93 for (lc = 0; TEST_LOOPING(lc); lc++) {
94 tst_count = 0;
95
96 /*
97 * fork a child that will attempt to read a non-existent
98 * message from the queue
99 */
100 if ((c_pid = FORK_OR_VFORK()) == -1)
101 tst_brkm(TBROK, cleanup, "could not fork");
102
103 if (c_pid == 0) {
104 /*
105 * Attempt to read a message without IPC_NOWAIT.
106 * With no message to read, the child sleeps.
107 */
108
109 #ifdef UCLINUX
110 if (self_exec(av[0], "d", msg_q_1) < 0)
111 tst_brkm(TBROK, cleanup, "could not self_exec");
112 #else
113 do_child();
114 #endif
115 } else {
116 TST_PROCESS_STATE_WAIT(cleanup, c_pid, 'S');
117
118 /* send a signal that must be caught to the child */
119 if (kill(c_pid, SIGHUP) == -1)
120 tst_brkm(TBROK, cleanup, "kill failed");
121
122 waitpid(c_pid, NULL, 0);
123 }
124 }
125
126 cleanup();
127
128 tst_exit();
129 }
130
do_child(void)131 void do_child(void)
132 {
133 TEST(msgrcv(msg_q_1, &rcv_buf, MSGSIZE, 1, 0));
134
135 if (TEST_RETURN != -1)
136 tst_brkm(TFAIL, NULL, "call succeeded unexpectedly");
137
138 switch (TEST_ERRNO) {
139 case EINTR:
140 tst_resm(TPASS, "got EINTR as expected");
141 break;
142 default:
143 tst_resm(TFAIL | TTERRNO,
144 "call failed with an unexpected error");
145 break;
146 }
147
148 exit(0);
149 }
150
sighandler(int sig)151 void sighandler(int sig)
152 {
153 if (sig == SIGHUP)
154 return;
155 else
156 tst_brkm(TBROK, NULL, "unexpected signal %d received", sig);
157 }
158
159 #ifdef UCLINUX
160 /*
161 * do_child_uclinux() - capture signals again, then run do_child()
162 */
do_child_uclinux(void)163 void do_child_uclinux(void)
164 {
165 tst_sig(FORK, sighandler, cleanup);
166
167 do_child();
168 }
169 #endif
170
171 /*
172 * setup() - performs all the ONE TIME setup for this test.
173 */
setup(void)174 void setup(void)
175 {
176
177 tst_sig(FORK, sighandler, cleanup);
178
179 TEST_PAUSE;
180
181 /*
182 * Create a temporary directory and cd into it.
183 * This helps to ensure that a unique msgkey is created.
184 * See ../lib/libipc.c for more information.
185 */
186 tst_tmpdir();
187
188 msgkey = getipckey();
189
190 /* create a message queue with read/write permission */
191 if ((msg_q_1 = msgget(msgkey, IPC_CREAT | IPC_EXCL | MSG_RW)) == -1)
192 tst_brkm(TBROK, cleanup, "Can't create message queue");
193 }
194
195 /*
196 * cleanup() - performs all the ONE TIME cleanup for this test at completion
197 * or premature exit.
198 */
cleanup(void)199 void cleanup(void)
200 {
201 /* if it exists, remove the message queue that was created */
202 rm_queue(msg_q_1);
203
204 tst_rmdir();
205
206 }
207