2 * Copyright (c) 1999 The NetBSD Foundation, Inc.
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.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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.
30 * Obtained from: $NetBSD: shmtest.c,v 1.3 2002/07/20 08:36:26 grant Exp $
35 * Test the SVID-compatible Shared Memory facility.
38 #include <sys/types.h>
52 static void print_shmid_ds(struct shmid_ds *, mode_t);
53 static void sigsys_handler(int);
54 static void sigchld_handler(int);
55 static void cleanup(void);
56 static void receiver(void);
57 static void usage(void);
59 static const char *m_str = "The quick brown fox jumped over the lazy dog.";
61 static int sender_shmid = -1;
62 static pid_t child_pid;
67 main(int argc, char *argv[])
78 * Install a SIGSYS handler so that we can exit gracefully if
79 * System V Shared Memory support isn't in the kernel.
81 sa.sa_handler = sigsys_handler;
82 sigemptyset(&sa.sa_mask);
84 if (sigaction(SIGSYS, &sa, NULL) == -1)
85 err(1, "sigaction SIGSYS");
88 * Install and SIGCHLD handler to deal with all possible exit
89 * conditions of the receiver.
91 sa.sa_handler = sigchld_handler;
92 sigemptyset(&sa.sa_mask);
94 if (sigaction(SIGCHLD, &sa, NULL) == -1)
95 err(1, "sigaction SIGCHLD");
97 pgsize = sysconf(_SC_PAGESIZE);
99 shmkey = ftok(argv[1], 4160);
102 * Initialize child_pid to ourselves to that the cleanup function
103 * works before we create the receiver.
105 child_pid = getpid();
108 * Make sure that when the sender exits, the message queue is
111 if (atexit(cleanup) == -1)
114 if ((sender_shmid = shmget(shmkey, pgsize, IPC_CREAT | 0640)) == -1)
117 if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
118 err(1, "shmctl IPC_STAT");
120 print_shmid_ds(&s_ds, 0640);
122 s_ds.shm_perm.mode = (s_ds.shm_perm.mode & ~0777) | 0600;
124 if (shmctl(sender_shmid, IPC_SET, &s_ds) == -1)
125 err(1, "shmctl IPC_SET");
127 memset(&s_ds, 0, sizeof(s_ds));
129 if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
130 err(1, "shmctl IPC_STAT");
132 if ((s_ds.shm_perm.mode & 0777) != 0600)
133 err(1, "IPC_SET of mode didn't hold");
135 print_shmid_ds(&s_ds, 0600);
137 if ((shm_buf = shmat(sender_shmid, NULL, 0)) == (void *) -1)
138 err(1, "sender: shmat");
141 * Write the test pattern into the shared memory buffer.
143 strcpy(shm_buf, m_str);
145 switch ((child_pid = fork())) {
159 * Suspend forever; when we get SIGCHLD, the handler will exit.
161 sigemptyset(&sigmask);
162 (void) sigsuspend(&sigmask);
165 * ...and any other signal is an unexpected error.
167 errx(1, "sender: received unexpected signal");
171 sigsys_handler(int signo __unused)
174 errx(1, "System V Shared Memory support is not present in the kernel");
178 sigchld_handler(int signo __unused)
180 struct shmid_ds s_ds;
184 * Reap the child; if it exited successfully, then the test passed!
186 if (waitpid(child_pid, &cstatus, 0) != child_pid)
189 if (WIFEXITED(cstatus) == 0)
190 errx(1, "receiver exited abnormally");
192 if (WEXITSTATUS(cstatus) != 0)
193 errx(1, "receiver exited with status %d",
194 WEXITSTATUS(cstatus));
197 * If we get here, the child has exited normally, and thus
198 * we should exit normally too. First, tho, we print out
199 * the final stats for the message queue.
202 if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
203 err(1, "shmctl IPC_STAT");
205 print_shmid_ds(&s_ds, 0600);
215 * If we're the sender, and it exists, remove the shared memory area.
217 if (child_pid != 0 && sender_shmid != -1) {
218 if (shmctl(sender_shmid, IPC_RMID, NULL) == -1)
219 warn("shmctl IPC_RMID");
224 print_shmid_ds(struct shmid_ds *sp, mode_t mode)
226 uid_t uid = geteuid();
227 gid_t gid = getegid();
229 printf("PERM: uid %d, gid %d, cuid %d, cgid %d, mode 0%o\n",
230 sp->shm_perm.uid, sp->shm_perm.gid,
231 sp->shm_perm.cuid, sp->shm_perm.cgid,
232 sp->shm_perm.mode & 0777);
234 printf("segsz %lu, lpid %d, cpid %d, nattch %u\n",
235 (u_long)sp->shm_segsz, sp->shm_lpid, sp->shm_cpid,
238 printf("atime: %s", ctime(&sp->shm_atime));
239 printf("dtime: %s", ctime(&sp->shm_dtime));
240 printf("ctime: %s", ctime(&sp->shm_ctime));
243 * Sanity check a few things.
246 if (sp->shm_perm.uid != uid || sp->shm_perm.cuid != uid)
247 errx(1, "uid mismatch");
249 if (sp->shm_perm.gid != gid || sp->shm_perm.cgid != gid)
250 errx(1, "gid mismatch");
252 if ((sp->shm_perm.mode & 0777) != mode)
253 errx(1, "mode mismatch");
260 fprintf(stderr, "usage: %s keypath\n", getprogname());
270 if ((shmid = shmget(shmkey, pgsize, 0)) == -1)
271 err(1, "receiver: shmget");
273 if ((shm_buf = shmat(shmid, NULL, 0)) == (void *) -1)
274 err(1, "receiver: shmat");
276 printf("%s\n", (const char *)shm_buf);
277 if (strcmp((const char *)shm_buf, m_str) != 0)
278 err(1, "receiver: data isn't correct");