1 /*- 2 * Copyright (c) 1999 The NetBSD Foundation, Inc. 3 * All rights reserved. 4 * 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. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 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. 17 * 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. 29 * 30 * Obtained from: $NetBSD: shmtest.c,v 1.3 2002/07/20 08:36:26 grant Exp $ 31 * $FreeBSD$ 32 */ 33 34 /* 35 * Test the SVID-compatible Shared Memory facility. 36 */ 37 38 #include <sys/types.h> 39 #include <sys/ipc.h> 40 #include <sys/shm.h> 41 #include <sys/wait.h> 42 43 #include <err.h> 44 #include <errno.h> 45 #include <signal.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <time.h> 50 #include <unistd.h> 51 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); 58 59 static const char *m_str = "The quick brown fox jumped over the lazy dog."; 60 61 static int sender_shmid = -1; 62 static pid_t child_pid; 63 static key_t shmkey; 64 static size_t pgsize; 65 66 int 67 main(int argc, char *argv[]) 68 { 69 struct sigaction sa; 70 struct shmid_ds s_ds; 71 sigset_t sigmask; 72 char *shm_buf; 73 74 if (argc != 2) 75 usage(); 76 77 /* 78 * Install a SIGSYS handler so that we can exit gracefully if 79 * System V Shared Memory support isn't in the kernel. 80 */ 81 sa.sa_handler = sigsys_handler; 82 sigemptyset(&sa.sa_mask); 83 sa.sa_flags = 0; 84 if (sigaction(SIGSYS, &sa, NULL) == -1) 85 err(1, "sigaction SIGSYS"); 86 87 /* 88 * Install and SIGCHLD handler to deal with all possible exit 89 * conditions of the receiver. 90 */ 91 sa.sa_handler = sigchld_handler; 92 sigemptyset(&sa.sa_mask); 93 sa.sa_flags = 0; 94 if (sigaction(SIGCHLD, &sa, NULL) == -1) 95 err(1, "sigaction SIGCHLD"); 96 97 pgsize = sysconf(_SC_PAGESIZE); 98 99 shmkey = ftok(argv[1], 4160); 100 101 /* 102 * Initialize child_pid to ourselves to that the cleanup function 103 * works before we create the receiver. 104 */ 105 child_pid = getpid(); 106 107 /* 108 * Make sure that when the sender exits, the message queue is 109 * removed. 110 */ 111 if (atexit(cleanup) == -1) 112 err(1, "atexit"); 113 114 if ((sender_shmid = shmget(shmkey, pgsize, IPC_CREAT | 0640)) == -1) 115 err(1, "shmget"); 116 117 if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1) 118 err(1, "shmctl IPC_STAT"); 119 120 print_shmid_ds(&s_ds, 0640); 121 122 s_ds.shm_perm.mode = (s_ds.shm_perm.mode & ~0777) | 0600; 123 124 if (shmctl(sender_shmid, IPC_SET, &s_ds) == -1) 125 err(1, "shmctl IPC_SET"); 126 127 memset(&s_ds, 0, sizeof(s_ds)); 128 129 if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1) 130 err(1, "shmctl IPC_STAT"); 131 132 if ((s_ds.shm_perm.mode & 0777) != 0600) 133 err(1, "IPC_SET of mode didn't hold"); 134 135 print_shmid_ds(&s_ds, 0600); 136 137 if ((shm_buf = shmat(sender_shmid, NULL, 0)) == (void *) -1) 138 err(1, "sender: shmat"); 139 140 /* 141 * Write the test pattern into the shared memory buffer. 142 */ 143 strcpy(shm_buf, m_str); 144 145 switch ((child_pid = fork())) { 146 case -1: 147 err(1, "fork"); 148 /* NOTREACHED */ 149 150 case 0: 151 receiver(); 152 break; 153 154 default: 155 break; 156 } 157 158 /* 159 * Suspend forever; when we get SIGCHLD, the handler will exit. 160 */ 161 sigemptyset(&sigmask); 162 (void) sigsuspend(&sigmask); 163 164 /* 165 * ...and any other signal is an unexpected error. 166 */ 167 errx(1, "sender: received unexpected signal"); 168 } 169 170 static void 171 sigsys_handler(int signo __unused) 172 { 173 174 errx(1, "System V Shared Memory support is not present in the kernel"); 175 } 176 177 static void 178 sigchld_handler(int signo __unused) 179 { 180 struct shmid_ds s_ds; 181 int cstatus; 182 183 /* 184 * Reap the child; if it exited successfully, then the test passed! 185 */ 186 if (waitpid(child_pid, &cstatus, 0) != child_pid) 187 err(1, "waitpid"); 188 189 if (WIFEXITED(cstatus) == 0) 190 errx(1, "receiver exited abnormally"); 191 192 if (WEXITSTATUS(cstatus) != 0) 193 errx(1, "receiver exited with status %d", 194 WEXITSTATUS(cstatus)); 195 196 /* 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. 200 */ 201 202 if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1) 203 err(1, "shmctl IPC_STAT"); 204 205 print_shmid_ds(&s_ds, 0600); 206 207 exit(0); 208 } 209 210 static void 211 cleanup(void) 212 { 213 214 /* 215 * If we're the sender, and it exists, remove the shared memory area. 216 */ 217 if (child_pid != 0 && sender_shmid != -1) { 218 if (shmctl(sender_shmid, IPC_RMID, NULL) == -1) 219 warn("shmctl IPC_RMID"); 220 } 221 } 222 223 static void 224 print_shmid_ds(struct shmid_ds *sp, mode_t mode) 225 { 226 uid_t uid = geteuid(); 227 gid_t gid = getegid(); 228 229 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); 233 234 printf("segsz %lu, lpid %d, cpid %d, nattch %u\n", 235 (u_long)sp->shm_segsz, sp->shm_lpid, sp->shm_cpid, 236 sp->shm_nattch); 237 238 printf("atime: %s", ctime(&sp->shm_atime)); 239 printf("dtime: %s", ctime(&sp->shm_dtime)); 240 printf("ctime: %s", ctime(&sp->shm_ctime)); 241 242 /* 243 * Sanity check a few things. 244 */ 245 246 if (sp->shm_perm.uid != uid || sp->shm_perm.cuid != uid) 247 errx(1, "uid mismatch"); 248 249 if (sp->shm_perm.gid != gid || sp->shm_perm.cgid != gid) 250 errx(1, "gid mismatch"); 251 252 if ((sp->shm_perm.mode & 0777) != mode) 253 errx(1, "mode mismatch"); 254 } 255 256 static void 257 usage(void) 258 { 259 260 fprintf(stderr, "usage: %s keypath\n", getprogname()); 261 exit(1); 262 } 263 264 static void 265 receiver(void) 266 { 267 int shmid; 268 void *shm_buf; 269 270 if ((shmid = shmget(shmkey, pgsize, 0)) == -1) 271 err(1, "receiver: shmget"); 272 273 if ((shm_buf = shmat(shmid, NULL, 0)) == (void *) -1) 274 err(1, "receiver: shmat"); 275 276 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"); 279 280 exit(0); 281 } 282