1 /* $NetBSD: t_msgrcv.c,v 1.4 2017/01/13 20:44:45 christos Exp $ */
2 
3 /*-
4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Jukka Ruohonen.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 #include <sys/cdefs.h>
32 __RCSID("$NetBSD: t_msgrcv.c,v 1.4 2017/01/13 20:44:45 christos Exp $");
33 
34 #include <sys/msg.h>
35 #include <sys/stat.h>
36 #include <sys/sysctl.h>
37 #include <sys/wait.h>
38 
39 #include <atf-c.h>
40 #include <errno.h>
41 #include <limits.h>
42 #include <pwd.h>
43 #include <signal.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <string.h>
47 #include <sysexits.h>
48 #include <time.h>
49 #include <unistd.h>
50 
51 #define MSG_KEY		1234
52 #define MSG_MTYPE_1	0x41
53 #define	MSG_MTYPE_2	0x42
54 #define MSG_MTYPE_3	0x43
55 #define MSG_LEN		3
56 
57 struct msg {
58 	long		 mtype;
59 	char		 buf[MSG_LEN];
60 };
61 
62 static void		clean(void);
63 
64 static void
65 clean(void)
66 {
67 	int id;
68 
69 	if ((id = msgget(MSG_KEY, 0)) != -1)
70 		(void)msgctl(id, IPC_RMID, 0);
71 }
72 
73 ATF_TC_WITH_CLEANUP(msgrcv_basic);
74 ATF_TC_HEAD(msgrcv_basic, tc)
75 {
76 	atf_tc_set_md_var(tc, "descr", "A basic test of msgrcv(2)");
77 }
78 
79 ATF_TC_BODY(msgrcv_basic, tc)
80 {
81 	struct msg msg1 = { MSG_MTYPE_1, { 'a', 'b', 'c' } };
82 	struct msg msg2 = { MSG_MTYPE_1, { 'x', 'y', 'z' } };
83 	int id;
84 
85 	id = msgget(MSG_KEY, IPC_CREAT | 0600);
86 	ATF_REQUIRE(id != -1);
87 
88 	(void)msgsnd(id, &msg1, MSG_LEN, IPC_NOWAIT);
89 	(void)msgrcv(id, &msg2, MSG_LEN, MSG_MTYPE_1, IPC_NOWAIT);
90 
91 	ATF_CHECK(msg1.buf[0] == msg2.buf[0]);
92 	ATF_CHECK(msg1.buf[1] == msg2.buf[1]);
93 	ATF_CHECK(msg1.buf[2] == msg2.buf[2]);
94 
95 	ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0);
96 }
97 
98 ATF_TC_CLEANUP(msgrcv_basic, tc)
99 {
100 	clean();
101 }
102 
103 ATF_TC_WITH_CLEANUP(msgrcv_block);
104 ATF_TC_HEAD(msgrcv_block, tc)
105 {
106 	atf_tc_set_md_var(tc, "descr", "Test that msgrcv(2) blocks");
107 }
108 
109 ATF_TC_BODY(msgrcv_block, tc)
110 {
111 	struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } };
112 	int id, sta;
113 	pid_t pid;
114 
115 	id = msgget(MSG_KEY, IPC_CREAT | 0600);
116 	ATF_REQUIRE(id != -1);
117 
118 	pid = fork();
119 	ATF_REQUIRE(pid >= 0);
120 
121 	if (pid == 0) {
122 
123 		if (msgrcv(id, &msg, MSG_LEN, MSG_MTYPE_1, 0) < 0)
124 			_exit(EXIT_FAILURE);
125 
126 		_exit(EXIT_SUCCESS);
127 	}
128 
129 	/*
130 	 * Below msgsnd(2) should unblock the child,
131 	 * and hence kill(2) should fail with ESRCH.
132 	 */
133 	(void)sleep(1);
134 	(void)msgsnd(id, &msg, MSG_LEN, IPC_NOWAIT);
135 	(void)sleep(1);
136 	(void)kill(pid, SIGKILL);
137 	(void)wait(&sta);
138 
139 	if (WIFEXITED(sta) == 0 || WIFSIGNALED(sta) != 0)
140 		atf_tc_fail("msgrcv(2) did not block");
141 
142 	ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0);
143 }
144 
145 ATF_TC_CLEANUP(msgrcv_block, tc)
146 {
147 	clean();
148 }
149 
150 ATF_TC_WITH_CLEANUP(msgrcv_err);
151 ATF_TC_HEAD(msgrcv_err, tc)
152 {
153 	atf_tc_set_md_var(tc, "descr", "Test errors from msgrcv(2)");
154 }
155 
156 ATF_TC_BODY(msgrcv_err, tc)
157 {
158 	struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } };
159 	int id, r = 0;
160 
161 	id = msgget(MSG_KEY, IPC_CREAT | 0600);
162 	ATF_REQUIRE(id != -1);
163 
164 	errno = 0;
165 
166 	ATF_REQUIRE_ERRNO(ENOMSG, msgrcv(id, &msg,
167 		MSG_LEN, MSG_MTYPE_1, IPC_NOWAIT) == -1);
168 
169 	ATF_REQUIRE(msgsnd(id, &msg, MSG_LEN, IPC_NOWAIT) == 0);
170 
171 	errno = 0;
172 
173 	ATF_REQUIRE_ERRNO(EFAULT, msgrcv(id, (void *)-1,
174 		MSG_LEN, MSG_MTYPE_1, IPC_NOWAIT) == -1);
175 
176 	errno = 0;
177 
178 	ATF_REQUIRE_ERRNO(EINVAL, msgrcv(-1, &msg,
179 		MSG_LEN, MSG_MTYPE_1, IPC_NOWAIT) == -1);
180 
181 	errno = 0;
182 
183 	ATF_REQUIRE_ERRNO(EINVAL, msgrcv(-1, &msg,
184 		SSIZE_MAX, MSG_MTYPE_1, IPC_NOWAIT) == -1);
185 
186 	ATF_REQUIRE(msgsnd(id, &msg, MSG_LEN, IPC_NOWAIT) == 0);
187 
188 	errno = 0;
189 
190 	ATF_REQUIRE_ERRNO(E2BIG, msgrcv(id, &r,
191 		MSG_LEN - 1, MSG_MTYPE_1, IPC_NOWAIT) == -1);
192 
193 	ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0);
194 }
195 
196 ATF_TC_CLEANUP(msgrcv_err, tc)
197 {
198 	clean();
199 }
200 
201 
202 ATF_TC_WITH_CLEANUP(msgrcv_mtype);
203 ATF_TC_HEAD(msgrcv_mtype, tc)
204 {
205 	atf_tc_set_md_var(tc, "descr", "Test message types with msgrcv(2)");
206 }
207 
208 ATF_TC_BODY(msgrcv_mtype, tc)
209 {
210 	struct msg msg1 = { MSG_MTYPE_1, { 'a', 'b', 'c' } };
211 	struct msg msg2 = { MSG_MTYPE_3, { 'x', 'y', 'z' } };
212 	int id;
213 
214 	id = msgget(MSG_KEY, IPC_CREAT | 0600);
215 	ATF_REQUIRE(id != -1);
216 
217 	(void)msgsnd(id, &msg1, MSG_LEN, IPC_NOWAIT);
218 	(void)msgrcv(id, &msg2, MSG_LEN, MSG_MTYPE_2, IPC_NOWAIT);
219 
220 	ATF_CHECK(msg1.buf[0] != msg2.buf[0]);	/* Different mtype. */
221 	ATF_CHECK(msg1.buf[1] != msg2.buf[1]);
222 	ATF_CHECK(msg1.buf[2] != msg2.buf[2]);
223 
224 	(void)msgrcv(id, &msg2, MSG_LEN, MSG_MTYPE_1, IPC_NOWAIT);
225 
226 	ATF_CHECK(msg1.buf[0] == msg2.buf[0]);	/* Same mtype. */
227 	ATF_CHECK(msg1.buf[1] == msg2.buf[1]);
228 	ATF_CHECK(msg1.buf[2] == msg2.buf[2]);
229 
230 	ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0);
231 }
232 
233 ATF_TC_CLEANUP(msgrcv_mtype, tc)
234 {
235 	clean();
236 }
237 
238 ATF_TC_WITH_CLEANUP(msgrcv_nonblock);
239 ATF_TC_HEAD(msgrcv_nonblock, tc)
240 {
241 	atf_tc_set_md_var(tc, "descr", "Test msgrcv(2) with IPC_NOWAIT");
242 	atf_tc_set_md_var(tc, "timeout", "10");
243 }
244 
245 ATF_TC_BODY(msgrcv_nonblock, tc)
246 {
247 	struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } };
248 	const ssize_t n = 10;
249 	int id, sta;
250 	ssize_t i;
251 	pid_t pid;
252 
253 	id = msgget(MSG_KEY, IPC_CREAT | 0600);
254 	ATF_REQUIRE(id != -1);
255 
256 	for (i = 0; i < n; i++) {
257 
258 		ATF_REQUIRE(msgsnd(id, &msg, MSG_LEN, IPC_NOWAIT) == 0);
259 	}
260 
261 	pid = fork();
262 	ATF_REQUIRE(pid >= 0);
263 
264 	if (pid == 0) {
265 
266 		while (i != 0) {
267 
268 			if (msgrcv(id, &msg, MSG_LEN, MSG_MTYPE_1,
269 			    IPC_NOWAIT) == -1)
270 				_exit(EXIT_FAILURE);
271 
272 			i--;
273 		}
274 
275 		_exit(EXIT_SUCCESS);
276 	}
277 
278 	(void)sleep(2);
279 	(void)kill(pid, SIGKILL);
280 	(void)wait(&sta);
281 
282 	if (WIFSIGNALED(sta) != 0 || WTERMSIG(sta) == SIGKILL)
283 		atf_tc_fail("msgrcv(2) blocked with IPC_NOWAIT");
284 
285 	if (WIFEXITED(sta) == 0 && WEXITSTATUS(sta) != EXIT_SUCCESS)
286 		atf_tc_fail("msgrcv(2) failed");
287 
288 	ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0);
289 }
290 
291 ATF_TC_CLEANUP(msgrcv_nonblock, tc)
292 {
293 	clean();
294 }
295 
296 ATF_TC_WITH_CLEANUP(msgrcv_truncate);
297 ATF_TC_HEAD(msgrcv_truncate, tc)
298 {
299 	atf_tc_set_md_var(tc, "descr", "Test msgrcv(2) with MSG_NOERROR");
300 }
301 
302 ATF_TC_BODY(msgrcv_truncate, tc)
303 {
304 #define	MSG_SMALLLEN	2
305 	struct msgsmall {
306 		long		 mtype;
307 		char		 buf[MSG_SMALLLEN];
308 	};
309 
310 	struct msg msg1 = { MSG_MTYPE_1, { 'a', 'b', 'c' } };
311 	struct msgsmall msg2 = { MSG_MTYPE_1, { 'x', 'y' } };
312 	int id;
313 
314 	id = msgget(MSG_KEY, IPC_CREAT | 0600);
315 	ATF_REQUIRE(id != -1);
316 
317 	(void)msgsnd(id, &msg1, MSG_LEN, IPC_NOWAIT);
318 	(void)msgrcv(id, &msg2, MSG_SMALLLEN,
319 	    MSG_MTYPE_1, IPC_NOWAIT | MSG_NOERROR);
320 
321 	ATF_CHECK(msg1.buf[0] == msg2.buf[0]);
322 	ATF_CHECK(msg1.buf[1] == msg2.buf[1]);
323 
324 	ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0);
325 }
326 
327 ATF_TC_CLEANUP(msgrcv_truncate, tc)
328 {
329 	clean();
330 }
331 
332 ATF_TP_ADD_TCS(tp)
333 {
334 
335 	ATF_TP_ADD_TC(tp, msgrcv_basic);
336 	ATF_TP_ADD_TC(tp, msgrcv_block);
337 	ATF_TP_ADD_TC(tp, msgrcv_err);
338 	ATF_TP_ADD_TC(tp, msgrcv_mtype);
339 	ATF_TP_ADD_TC(tp, msgrcv_nonblock);
340 	ATF_TP_ADD_TC(tp, msgrcv_truncate);
341 
342 	return atf_no_error();
343 }
344