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
44 static int shmid = -1;
45 static key_t shmkey;
46 static char *shm_buf;
47
48 static int semid = -1;
49 static key_t semkey;
50 static struct sembuf sop[2];
51
52 static size_t pgsize;
53 static pid_t pid;
54
55 int
setup(int nb __unused)56 setup(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
96 void
cleanup(void)97 cleanup(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
107 static void
Wait(int i)108 Wait(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
118 static void
Sig(int i)119 Sig(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
129 int
test(void)130 test(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