t_msgrcv.c revision 314817 
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
57struct msg {
58	long		 mtype;
59	char		 buf[MSG_LEN];
60};
61
62static void		clean(void);
63
64static void
65clean(void)
66{
67	int id;
68
69	if ((id = msgget(MSG_KEY, 0)) != -1)
70		(void)msgctl(id, IPC_RMID, 0);
71}
72
73ATF_TC_WITH_CLEANUP(msgrcv_basic);
74ATF_TC_HEAD(msgrcv_basic, tc)
75{
76	atf_tc_set_md_var(tc, "descr", "A basic test of msgrcv(2)");
77}
78
79ATF_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
98ATF_TC_CLEANUP(msgrcv_basic, tc)
99{
100	clean();
101}
102
103ATF_TC_WITH_CLEANUP(msgrcv_block);
104ATF_TC_HEAD(msgrcv_block, tc)
105{
106	atf_tc_set_md_var(tc, "descr", "Test that msgrcv(2) blocks");
107}
108
109ATF_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
145ATF_TC_CLEANUP(msgrcv_block, tc)
146{
147	clean();
148}
149
150ATF_TC_WITH_CLEANUP(msgrcv_err);
151ATF_TC_HEAD(msgrcv_err, tc)
152{
153	atf_tc_set_md_var(tc, "descr", "Test errors from msgrcv(2)");
154}
155
156ATF_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
196ATF_TC_CLEANUP(msgrcv_err, tc)
197{
198	clean();
199}
200
201
202ATF_TC_WITH_CLEANUP(msgrcv_mtype);
203ATF_TC_HEAD(msgrcv_mtype, tc)
204{
205	atf_tc_set_md_var(tc, "descr", "Test message types with msgrcv(2)");
206}
207
208ATF_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
233ATF_TC_CLEANUP(msgrcv_mtype, tc)
234{
235	clean();
236}
237
238ATF_TC_WITH_CLEANUP(msgrcv_nonblock);
239ATF_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
245ATF_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
291ATF_TC_CLEANUP(msgrcv_nonblock, tc)
292{
293	clean();
294}
295
296ATF_TC_WITH_CLEANUP(msgrcv_truncate);
297ATF_TC_HEAD(msgrcv_truncate, tc)
298{
299	atf_tc_set_md_var(tc, "descr", "Test msgrcv(2) with MSG_NOERROR");
300}
301
302ATF_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
327ATF_TC_CLEANUP(msgrcv_truncate, tc)
328{
329	clean();
330}
331
332ATF_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