1/*-
2 * Copyright (c) 2008 Peter Holm <pho@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28/* Test shared memory */
29
30#include <sys/param.h>
31#include <sys/ipc.h>
32#include <sys/msg.h>
33#include <sys/sem.h>
34#include <sys/shm.h>
35#include <err.h>
36#include <errno.h>
37#include <signal.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <unistd.h>
41
42#include "stress.h"
43
44static int	shmid = -1;
45static key_t	shmkey;
46static char	*shm_buf;
47
48static int	semid = -1;
49static key_t	semkey;
50static struct	sembuf sop[2];
51
52static size_t	pgsize;
53static pid_t	pid;
54
55int
56setup(int nb __unused)
57{
58	int seed;
59
60	pgsize = sysconf(_SC_PAGESIZE);
61
62	seed = getpid();
63	shmkey = ftok("/tmp", seed);
64	if ((shmid = shmget(shmkey, 10 * pgsize, IPC_CREAT | IPC_EXCL | 0640)) == -1) {
65		if (errno == ENOSPC) {
66			fprintf(stderr, "Max number of semaphores reached.\n");
67			exit(1);
68		}
69		err(1, "shmget (%s:%d)", __FILE__, __LINE__);
70	}
71
72	shm_buf = 0;
73	if ((shm_buf = shmat(shmid, NULL, 0)) == (void *) -1)
74		err(1, "sender: shmat (%s:%d)", __FILE__, __LINE__);
75
76	semkey = ftok("/var", seed);
77	if ((semid = semget(semkey, 2, IPC_CREAT | IPC_EXCL | 0640)) == -1) {
78		if (errno == ENOSPC) {
79			fprintf(stderr, "Max number of semaphores reached.\n");
80			exit(1);
81		}
82		err(1, "semget (%s:%d)", __FILE__, __LINE__);
83	}
84        /* Initialize the semaphore. */
85        sop[0].sem_num = 0;
86        sop[0].sem_op  = 0;  /* This is the number of runs without queuing. */
87        sop[0].sem_flg = 0;
88        sop[1].sem_num = 1;
89        sop[1].sem_op  = 0;  /* This is the number of runs without queuing. */
90        sop[1].sem_flg = 0;
91        if (semop(semid, sop, 2) == -1)
92            err(1, "init: semop (%s:%d)", __FILE__, __LINE__);
93        return (0);
94}
95
96void
97cleanup(void)
98{
99	if (shmid != -1)
100		if (shmctl(shmid, IPC_RMID, NULL) == -1 && errno != EINVAL)
101			warn("shmctl IPC_RMID (%s:%d)", __FILE__, __LINE__);
102	if (semid != -1)
103		if (semctl(semid, 0, IPC_RMID, 0) == -1 && errno != EINVAL)
104			warn("shmctl IPC_RMID (%s:%d)", __FILE__, __LINE__);
105}
106
107static void
108Wait(int i) {
109		sop[0].sem_num = i;
110		sop[0].sem_op = -1;
111		if (semop(semid, sop, 1) == -1) {
112			if (errno != EINTR && errno != EIDRM && errno != EINVAL)
113				warn("Wait: semop (%s:%d)", __FILE__, __LINE__);
114			done_testing = 1;
115		}
116}
117
118static void
119Sig(int i) {
120		sop[0].sem_num = i;
121		sop[0].sem_op = 1;
122		if (semop(semid, sop, 1) == -1) {
123			if (errno != EINTR && errno != EIDRM && errno != EINVAL)
124			warn("Sig: semop (%s:%d)", __FILE__, __LINE__);
125			done_testing = 1;
126		}
127}
128
129int
130test(void)
131{
132	int i = 0;
133
134	pid = fork();
135	if (pid == -1) {
136		perror("fork");
137		exit(2);
138	}
139
140	if (pid == 0) {	/* child */
141		i = 0;
142		for (;;) {
143			Wait(1);
144			if (done_testing == 1)
145				break;
146			if (shm_buf[i] != (i % 128)) {
147				fprintf(stderr,
148					"child %d: expected %d, got %d\n",
149					getpid(), i % 128, shm_buf[i]);
150				break;
151			}
152			shm_buf[i] = 0;
153			i = (i + 1) % (10 * pgsize);
154			shm_buf[i] = (i % 128);
155			i = (i + 1) % (10 * pgsize);
156			Sig(0);
157		}
158		_exit(0);
159
160	} else {	/* parent */
161		i = 0;
162		for (;;) {
163			shm_buf[i] = (i % 128);
164			Sig(1);
165			i = (i + 1) % (10 * pgsize);
166			Wait(0);
167			if (done_testing == 1)
168				break;
169			if (shm_buf[i] != (i % 128)) {
170				fprintf(stderr,
171					"parent(%d): expected %d, got %d\n",
172					getpid(), i % 128, shm_buf[i]);
173				break;
174			}
175			shm_buf[i] = 0;
176			i = (i + 1) % (10 * pgsize);
177		}
178		kill(pid, SIGHUP);
179		kill(pid, SIGKILL);
180	}
181        return (0);
182}
183