1 /* $NetBSD: shmtest.c,v 1.2 2001/02/19 22:44:41 cgd Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Test the SVID-compatible Shared Memory facility. 42 */ 43 44 #include <sys/param.h> 45 #include <sys/ipc.h> 46 #include <sys/shm.h> 47 #include <sys/wait.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <signal.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <time.h> 56 #include <unistd.h> 57 58 int main(int, char *[]); 59 void print_shmid_ds(struct shmid_ds *, mode_t); 60 void sigsys_handler(int); 61 void sigchld_handler(int); 62 void cleanup(void); 63 void receiver(void); 64 65 const char *m_str = "The quick brown fox jumped over the lazy dog."; 66 67 int sender_shmid = -1; 68 pid_t child_pid; 69 70 key_t shmkey; 71 72 char keyname[] = "/tmp/msgtestXXXXXXXX"; 73 74 int verbose; 75 76 size_t pgsize; 77 78 int 79 main(argc, argv) 80 int argc; 81 char *argv[]; 82 { 83 struct sigaction sa; 84 struct shmid_ds s_ds; 85 sigset_t sigmask; 86 char *shm_buf; 87 int fd, ch; 88 89 if ((fd = mkstemp(keyname)) < 0) 90 err(1, "mkstemp"); 91 92 close(fd); 93 94 while ((ch = getopt(argc, argv, "v")) != -1) { 95 switch (ch) { 96 case 'v': 97 verbose = 1; 98 break; 99 default: 100 fprintf(stderr, "Usage: shmtest [-v]\n"); 101 exit(1); 102 } 103 } 104 105 /* 106 * Install a SIGSYS handler so that we can exit gracefully if 107 * System V Shared Memory support isn't in the kernel. 108 */ 109 sa.sa_handler = sigsys_handler; 110 sigemptyset(&sa.sa_mask); 111 sa.sa_flags = 0; 112 if (sigaction(SIGSYS, &sa, NULL) == -1) 113 err(1, "sigaction SIGSYS"); 114 115 /* 116 * Install and SIGCHLD handler to deal with all possible exit 117 * conditions of the receiver. 118 */ 119 sa.sa_handler = sigchld_handler; 120 sigemptyset(&sa.sa_mask); 121 sa.sa_flags = 0; 122 if (sigaction(SIGCHLD, &sa, NULL) == -1) 123 err(1, "sigaction SIGCHLD"); 124 125 pgsize = sysconf(_SC_PAGESIZE); 126 127 shmkey = ftok(argv[1], 4160); 128 129 /* 130 * Initialize child_pid to ourselves to that the cleanup function 131 * works before we create the receiver. 132 */ 133 child_pid = getpid(); 134 135 /* 136 * Make sure that when the sender exits, the message queue is 137 * removed. 138 */ 139 if (atexit(cleanup) == -1) 140 err(1, "atexit"); 141 142 if ((sender_shmid = shmget(shmkey, pgsize, IPC_CREAT | 0640)) == -1) 143 err(1, "shmget"); 144 145 if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1) 146 err(1, "shmctl IPC_STAT"); 147 148 if (verbose) 149 print_shmid_ds(&s_ds, 0640); 150 151 s_ds.shm_perm.mode = (s_ds.shm_perm.mode & ~0777) | 0600; 152 153 if (shmctl(sender_shmid, IPC_SET, &s_ds) == -1) 154 err(1, "shmctl IPC_SET"); 155 156 memset(&s_ds, 0, sizeof(s_ds)); 157 158 if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1) 159 err(1, "shmctl IPC_STAT"); 160 161 if ((s_ds.shm_perm.mode & 0777) != 0600) 162 err(1, "IPC_SET of mode didn't hold"); 163 164 if (verbose) 165 print_shmid_ds(&s_ds, 0600); 166 167 if ((shm_buf = shmat(sender_shmid, NULL, 0)) == (void *) -1) 168 err(1, "sender: shmat"); 169 170 /* 171 * Write the test pattern into the shared memory buffer. 172 */ 173 strcpy(shm_buf, m_str); 174 175 switch ((child_pid = fork())) { 176 case -1: 177 err(1, "fork"); 178 /* NOTREACHED */ 179 180 case 0: 181 receiver(); 182 break; 183 184 default: 185 break; 186 } 187 188 /* 189 * Suspend forever; when we get SIGCHLD, the handler will exit. 190 */ 191 sigemptyset(&sigmask); 192 (void) sigsuspend(&sigmask); 193 194 /* 195 * ...and any other signal is an unexpected error. 196 */ 197 errx(1, "sender: received unexpected signal"); 198 } 199 200 void 201 sigsys_handler(signo) 202 int signo; 203 { 204 205 errx(1, "System V Shared Memory support is not present in the kernel"); 206 } 207 208 void 209 sigchld_handler(signo) 210 int signo; 211 { 212 struct shmid_ds s_ds; 213 int cstatus; 214 215 /* 216 * Reap the child; if it exited successfully, then the test passed! 217 */ 218 if (waitpid(child_pid, &cstatus, 0) != child_pid) 219 err(1, "waitpid"); 220 221 if (WIFEXITED(cstatus) == 0) 222 errx(1, "receiver exited abnormally"); 223 224 if (WEXITSTATUS(cstatus) != 0) 225 errx(1, "receiver exited with status %d", 226 WEXITSTATUS(cstatus)); 227 228 /* 229 * If we get here, the child has exited normally, and thus 230 * we should exit normally too. First, tho, we print out 231 * the final stats for the message queue. 232 */ 233 234 if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1) 235 err(1, "shmctl IPC_STAT"); 236 237 if (verbose) 238 print_shmid_ds(&s_ds, 0600); 239 240 exit(0); 241 } 242 243 void 244 cleanup() 245 { 246 247 /* 248 * If we're the sender, and it exists, remove the shared memory area. 249 */ 250 if (child_pid != 0 && sender_shmid != -1) { 251 if (shmctl(sender_shmid, IPC_RMID, NULL) == -1) 252 warn("shmctl IPC_RMID"); 253 } 254 255 remove(keyname); 256 } 257 258 void 259 print_shmid_ds(sp, mode) 260 struct shmid_ds *sp; 261 mode_t mode; 262 { 263 uid_t uid = geteuid(); 264 gid_t gid = getegid(); 265 266 printf("PERM: uid %u, gid %u, cuid %u, cgid %u, mode 0%o\n", 267 sp->shm_perm.uid, sp->shm_perm.gid, 268 sp->shm_perm.cuid, sp->shm_perm.cgid, 269 sp->shm_perm.mode & 0777); 270 271 printf("segsz %lu, lpid %d, cpid %d, nattch %u\n", 272 (u_long)sp->shm_segsz, sp->shm_lpid, sp->shm_cpid, 273 sp->shm_nattch); 274 275 printf("atime: %s", ctime(&sp->shm_atime)); 276 printf("dtime: %s", ctime(&sp->shm_dtime)); 277 printf("ctime: %s", ctime(&sp->shm_ctime)); 278 279 /* 280 * Sanity check a few things. 281 */ 282 283 if (sp->shm_perm.uid != uid || sp->shm_perm.cuid != uid) 284 errx(1, "uid mismatch"); 285 286 if (sp->shm_perm.gid != gid || sp->shm_perm.cgid != gid) 287 errx(1, "gid mismatch"); 288 289 if ((sp->shm_perm.mode & 0777) != mode) 290 errx(1, "mode mismatch"); 291 } 292 293 void 294 receiver() 295 { 296 int shmid; 297 void *shm_buf; 298 299 if ((shmid = shmget(shmkey, pgsize, 0)) == -1) 300 err(1, "receiver: shmget"); 301 302 if ((shm_buf = shmat(shmid, NULL, 0)) == (void *) -1) 303 err(1, "receiver: shmat"); 304 305 if (verbose) 306 printf("%s\n", (const char *)shm_buf); 307 if (strcmp((const char *)shm_buf, m_str) != 0) 308 err(1, "receiver: data isn't correct"); 309 310 exit(0); 311 } 312