1/*-
2 * Copyright (c) 1999 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
7 * NASA Ames Research Center.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 *
30 * Obtained from: $NetBSD: shmtest.c,v 1.3 2002/07/20 08:36:26 grant Exp $
31 * $FreeBSD$
32 */
33
34/*
35 * Test the SVID-compatible Shared Memory facility.
36 */
37
38#include <sys/types.h>
39#include <sys/ipc.h>
40#include <sys/shm.h>
41#include <sys/wait.h>
42
43#include <err.h>
44#include <errno.h>
45#include <signal.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49#include <time.h>
50#include <unistd.h>
51
52int	main __P((int, char *[]));
53void	print_shmid_ds __P((struct shmid_ds *, mode_t));
54void	sigsys_handler __P((int));
55void	sigchld_handler __P((int));
56void	cleanup __P((void));
57void	receiver __P((void));
58void	usage __P((void));
59
60const char *m_str = "The quick brown fox jumped over the lazy dog.";
61
62int	sender_shmid = -1;
63pid_t	child_pid;
64
65key_t	shmkey;
66
67size_t	pgsize;
68
69int
70main(argc, argv)
71	int argc;
72	char *argv[];
73{
74	struct sigaction sa;
75	struct shmid_ds s_ds;
76	sigset_t sigmask;
77	char *shm_buf;
78
79	if (argc != 2)
80		usage();
81
82	/*
83	 * Install a SIGSYS handler so that we can exit gracefully if
84	 * System V Shared Memory support isn't in the kernel.
85	 */
86	sa.sa_handler = sigsys_handler;
87	sigemptyset(&sa.sa_mask);
88	sa.sa_flags = 0;
89	if (sigaction(SIGSYS, &sa, NULL) == -1)
90		err(1, "sigaction SIGSYS");
91
92	/*
93	 * Install and SIGCHLD handler to deal with all possible exit
94	 * conditions of the receiver.
95	 */
96	sa.sa_handler = sigchld_handler;
97	sigemptyset(&sa.sa_mask);
98	sa.sa_flags = 0;
99	if (sigaction(SIGCHLD, &sa, NULL) == -1)
100		err(1, "sigaction SIGCHLD");
101
102	pgsize = sysconf(_SC_PAGESIZE);
103
104	shmkey = ftok(argv[1], 4160);
105
106	/*
107	 * Initialize child_pid to ourselves to that the cleanup function
108	 * works before we create the receiver.
109	 */
110	child_pid = getpid();
111
112	/*
113	 * Make sure that when the sender exits, the message queue is
114	 * removed.
115	 */
116	if (atexit(cleanup) == -1)
117		err(1, "atexit");
118
119	if ((sender_shmid = shmget(shmkey, pgsize, IPC_CREAT | 0640)) == -1)
120		err(1, "shmget");
121
122	if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
123		err(1, "shmctl IPC_STAT");
124
125	print_shmid_ds(&s_ds, 0640);
126
127	s_ds.shm_perm.mode = (s_ds.shm_perm.mode & ~0777) | 0600;
128
129	if (shmctl(sender_shmid, IPC_SET, &s_ds) == -1)
130		err(1, "shmctl IPC_SET");
131
132	memset(&s_ds, 0, sizeof(s_ds));
133
134	if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
135		err(1, "shmctl IPC_STAT");
136
137	if ((s_ds.shm_perm.mode & 0777) != 0600)
138		err(1, "IPC_SET of mode didn't hold");
139
140	print_shmid_ds(&s_ds, 0600);
141
142	if ((shm_buf = shmat(sender_shmid, NULL, 0)) == (void *) -1)
143		err(1, "sender: shmat");
144
145	/*
146	 * Write the test pattern into the shared memory buffer.
147	 */
148	strcpy(shm_buf, m_str);
149
150	switch ((child_pid = fork())) {
151	case -1:
152		err(1, "fork");
153		/* NOTREACHED */
154
155	case 0:
156		receiver();
157		break;
158
159	default:
160		break;
161	}
162
163	/*
164	 * Suspend forever; when we get SIGCHLD, the handler will exit.
165	 */
166	sigemptyset(&sigmask);
167	(void) sigsuspend(&sigmask);
168
169	/*
170	 * ...and any other signal is an unexpected error.
171	 */
172	errx(1, "sender: received unexpected signal");
173}
174
175void
176sigsys_handler(signo)
177	int signo;
178{
179
180	errx(1, "System V Shared Memory support is not present in the kernel");
181}
182
183void
184sigchld_handler(signo)
185	int signo;
186{
187	struct shmid_ds s_ds;
188	int cstatus;
189
190	/*
191	 * Reap the child; if it exited successfully, then the test passed!
192	 */
193	if (waitpid(child_pid, &cstatus, 0) != child_pid)
194		err(1, "waitpid");
195
196	if (WIFEXITED(cstatus) == 0)
197		errx(1, "receiver exited abnormally");
198
199	if (WEXITSTATUS(cstatus) != 0)
200		errx(1, "receiver exited with status %d",
201		    WEXITSTATUS(cstatus));
202
203	/*
204	 * If we get here, the child has exited normally, and thus
205	 * we should exit normally too.  First, tho, we print out
206	 * the final stats for the message queue.
207	 */
208
209	if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
210		err(1, "shmctl IPC_STAT");
211
212	print_shmid_ds(&s_ds, 0600);
213
214	exit(0);
215}
216
217void
218cleanup()
219{
220
221	/*
222	 * If we're the sender, and it exists, remove the shared memory area.
223	 */
224	if (child_pid != 0 && sender_shmid != -1) {
225		if (shmctl(sender_shmid, IPC_RMID, NULL) == -1)
226			warn("shmctl IPC_RMID");
227	}
228}
229
230void
231print_shmid_ds(sp, mode)
232	struct shmid_ds *sp;
233	mode_t mode;
234{
235	uid_t uid = geteuid();
236	gid_t gid = getegid();
237
238	printf("PERM: uid %d, gid %d, cuid %d, cgid %d, mode 0%o\n",
239	    sp->shm_perm.uid, sp->shm_perm.gid,
240	    sp->shm_perm.cuid, sp->shm_perm.cgid,
241	    sp->shm_perm.mode & 0777);
242
243	printf("segsz %lu, lpid %d, cpid %d, nattch %u\n",
244	    (u_long)sp->shm_segsz, sp->shm_lpid, sp->shm_cpid,
245	    sp->shm_nattch);
246
247	printf("atime: %s", ctime(&sp->shm_atime));
248	printf("dtime: %s", ctime(&sp->shm_dtime));
249	printf("ctime: %s", ctime(&sp->shm_ctime));
250
251	/*
252	 * Sanity check a few things.
253	 */
254
255	if (sp->shm_perm.uid != uid || sp->shm_perm.cuid != uid)
256		errx(1, "uid mismatch");
257
258	if (sp->shm_perm.gid != gid || sp->shm_perm.cgid != gid)
259		errx(1, "gid mismatch");
260
261	if ((sp->shm_perm.mode & 0777) != mode)
262		errx(1, "mode mismatch");
263}
264
265void
266usage()
267{
268
269	fprintf(stderr, "usage: %s keypath\n", getprogname());
270	exit(1);
271}
272
273void
274receiver()
275{
276	int shmid;
277	void *shm_buf;
278
279	if ((shmid = shmget(shmkey, pgsize, 0)) == -1)
280		err(1, "receiver: shmget");
281
282	if ((shm_buf = shmat(shmid, NULL, 0)) == (void *) -1)
283		err(1, "receiver: shmat");
284
285	printf("%s\n", (const char *)shm_buf);
286	if (strcmp((const char *)shm_buf, m_str) != 0)
287		err(1, "receiver: data isn't correct");
288
289	exit(0);
290}
291