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 <stdio.h>
31 #include <stdlib.h>
32 #include <unistd.h>
33 #include <sys/types.h>
34 #include <sys/param.h>
35 #include <sys/ipc.h>
36 #include <sys/msg.h>
37 #include <sys/shm.h>
38 #include <sys/sem.h>
39 #include <signal.h>
40 #include <errno.h>
41 #include <err.h>
42
43 #include "stress.h"
44
45 int shmid = -1;
46 key_t shmkey;
47 char *shm_buf;
48
49 int semid = -1;
50 key_t semkey;
51 struct sembuf sop[2];
52
53 size_t pgsize;
54 pid_t pid;
55
56 int
setup(int nb)57 setup(int nb)
58 {
59 int seed;
60
61 pgsize = sysconf(_SC_PAGESIZE);
62
63 seed = getpid();
64 // printf("seed(%d) = %d\n", getpid(), seed);
65 shmkey = ftok("/tmp", seed);
66 if ((shmid = shmget(shmkey, 10 * pgsize, IPC_CREAT | IPC_EXCL | 0640)) == -1) {
67 if (errno == ENOSPC) {
68 fprintf(stderr, "Max number of semaphores reached.\n");
69 exit(1);
70 }
71 err(1, "shmget (%s:%d)", __FILE__, __LINE__);
72 }
73
74 shm_buf = NULL;
75 if ((shm_buf = shmat(shmid, NULL, 0)) == (void *) -1)
76 err(1, "sender: shmat (%s:%d)", __FILE__, __LINE__);
77
78 // printf("seed(%d) = %d\n", getpid(), seed);
79 semkey = ftok("/var", seed);
80 if ((semid = semget(semkey, 2, IPC_CREAT | IPC_EXCL | 0640)) == -1) {
81 if (errno == ENOSPC) {
82 fprintf(stderr, "Max number of semaphores reached.\n");
83 exit(1);
84 }
85 err(1, "semget (%s:%d)", __FILE__, __LINE__);
86 }
87 /* Initialize the semaphore. */
88 sop[0].sem_num = 0;
89 sop[0].sem_op = 0; /* This is the number of runs without queuing. */
90 sop[0].sem_flg = 0;
91 sop[1].sem_num = 1;
92 sop[1].sem_op = 0; /* This is the number of runs without queuing. */
93 sop[1].sem_flg = 0;
94 if (semop(semid, sop, 2) == -1)
95 err(1, "init: semop (%s:%d)", __FILE__, __LINE__);
96 return (0);
97 }
98
99 void
cleanup(void)100 cleanup(void)
101 {
102 if (shmid != -1)
103 if (shmctl(shmid, IPC_RMID, NULL) == -1 && errno != EINVAL)
104 warn("shmctl IPC_RMID (%s:%d)", __FILE__, __LINE__);
105 if (semid != -1)
106 if (semctl(semid, 0, IPC_RMID, 0) == -1 && errno != EINVAL)
107 warn("shmctl IPC_RMID (%s:%d)", __FILE__, __LINE__);
108 }
109
110 static void
Wait(int i)111 Wait(int i) {
112 sop[0].sem_num = i;
113 sop[0].sem_op = -1;
114 if (semop(semid, sop, 1) == -1) {
115 if (errno != EINTR && errno != EIDRM && errno != EINVAL)
116 warn("Wait: semop (%s:%d)", __FILE__, __LINE__);
117 done_testing = 1;
118 }
119 }
120
121 static void
Sig(int i)122 Sig(int i) {
123 sop[0].sem_num = i;
124 sop[0].sem_op = 1;
125 if (semop(semid, sop, 1) == -1) {
126 if (errno != EINTR && errno != EIDRM && errno != EINVAL)
127 warn("Sig: semop (%s:%d)", __FILE__, __LINE__);
128 done_testing = 1;
129 }
130 }
131
132 int
test(void)133 test(void)
134 {
135 int i = 0;
136
137 pid = fork();
138 if (pid == -1) {
139 perror("fork");
140 exit(2);
141 }
142
143 if (pid == 0) { /* child */
144 i = 0;
145 for (;;) {
146 Wait(1);
147 if (done_testing == 1)
148 break;
149 if (shm_buf[i] != (i % 128)) {
150 fprintf(stderr,
151 "child %d: expected %d, got %d\n",
152 getpid(), i % 128, shm_buf[i]);
153 break;
154 }
155 shm_buf[i] = 0;
156 i = (i + 1) % (10 * pgsize);
157 shm_buf[i] = (i % 128);
158 i = (i + 1) % (10 * pgsize);
159 Sig(0);
160 }
161 exit(0);
162
163 } else { /* parent */
164 i = 0;
165 for (;;) {
166 shm_buf[i] = (i % 128);
167 Sig(1);
168 i = (i + 1) % (10 * pgsize);
169 Wait(0);
170 if (done_testing == 1)
171 break;
172 if (shm_buf[i] != (i % 128)) {
173 fprintf(stderr,
174 "parent(%d): expected %d, got %d\n",
175 getpid(), i % 128, shm_buf[i]);
176 break;
177 }
178 shm_buf[i] = 0;
179 i = (i + 1) % (10 * pgsize);
180 }
181 kill(pid, SIGHUP);
182 kill(pid, SIGKILL);
183 }
184 return (0);
185 }
186