tools/regression/sysvshm/shmtest.c

   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  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the NetBSD
  20  *      Foundation, Inc. and its contributors.
  21  * 4. Neither the name of The NetBSD Foundation nor the names of its
  22  *    contributors may be used to endorse or promote products derived
  23  *    from this software without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  26  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * Obtained from: $NetBSD: shmtest.c,v 1.3 2002/07/20 08:36:26 grant Exp $
  38  * $DragonFly: src/tools/regression/sysvshm/shmtest.c,v 1.2 2003/11/14 03:54:33 dillon Exp $
  39  */
  40
  41 /*
  42  * Test the SVID-compatible Shared Memory facility.
  43  */
  44
  45 #include <sys/param.h>
  46 #include <sys/ipc.h>
  47 #include <sys/shm.h>
  48 #include <sys/wait.h>
  49
  50 #include <err.h>
  51 #include <errno.h>
  52 #include <signal.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <time.h>
  57 #include <unistd.h>
  58
  59 int     main (int, char *[]);
  60 void    print_shmid_ds (struct shmid_ds *, mode_t);
  61 void    sigsys_handler (int);
  62 void    sigchld_handler (int);
  63 void    cleanup (void);
  64 void    receiver (void);
  65 void    usage (void);
  66
  67 const char *m_str = "The quick brown fox jumped over the lazy dog.";
  68
  69 int     sender_shmid = -1;
  70 pid_t   child_pid;
  71
  72 key_t   shmkey;
  73
  74 size_t  pgsize;
  75
  76 int
  77 main(argc, argv)
  78         int argc;
  79         char *argv[];
  80 {
  81         struct sigaction sa;
  82         struct shmid_ds s_ds;
  83         sigset_t sigmask;
  84         char *shm_buf;
  85
  86         if (argc != 2)
  87                 usage();
  88
  89         /*
  90          * Install a SIGSYS handler so that we can exit gracefully if
  91          * System V Shared Memory support isn't in the kernel.
  92          */
  93         sa.sa_handler = sigsys_handler;
  94         sigemptyset(&sa.sa_mask);
  95         sa.sa_flags = 0;
  96         if (sigaction(SIGSYS, &sa, NULL) == -1)
  97                 err(1, "sigaction SIGSYS");
  98
  99         /*
 100          * Install and SIGCHLD handler to deal with all possible exit
 101          * conditions of the receiver.
 102          */
 103         sa.sa_handler = sigchld_handler;
 104         sigemptyset(&sa.sa_mask);
 105         sa.sa_flags = 0;
 106         if (sigaction(SIGCHLD, &sa, NULL) == -1)
 107                 err(1, "sigaction SIGCHLD");
 108
 109         pgsize = sysconf(_SC_PAGESIZE);
 110
 111         shmkey = ftok(argv[1], 4160);
 112
 113         /*
 114          * Initialize child_pid to ourselves to that the cleanup function
 115          * works before we create the receiver.
 116          */
 117         child_pid = getpid();
 118
 119         /*
 120          * Make sure that when the sender exits, the message queue is
 121          * removed.
 122          */
 123         if (atexit(cleanup) == -1)
 124                 err(1, "atexit");
 125
 126         if ((sender_shmid = shmget(shmkey, pgsize, IPC_CREAT | 0640)) == -1)
 127                 err(1, "shmget");
 128
 129         if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
 130                 err(1, "shmctl IPC_STAT");
 131
 132         print_shmid_ds(&s_ds, 0640);
 133
 134         s_ds.shm_perm.mode = (s_ds.shm_perm.mode & ~0777) | 0600;
 135
 136         if (shmctl(sender_shmid, IPC_SET, &s_ds) == -1)
 137                 err(1, "shmctl IPC_SET");
 138
 139         memset(&s_ds, 0, sizeof(s_ds));
 140
 141         if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
 142                 err(1, "shmctl IPC_STAT");
 143
 144         if ((s_ds.shm_perm.mode & 0777) != 0600)
 145                 err(1, "IPC_SET of mode didn't hold");
 146
 147         print_shmid_ds(&s_ds, 0600);
 148
 149         if ((shm_buf = shmat(sender_shmid, NULL, 0)) == (void *) -1)
 150                 err(1, "sender: shmat");
 151
 152         /*
 153          * Write the test pattern into the shared memory buffer.
 154          */
 155         strcpy(shm_buf, m_str);
 156
 157         switch ((child_pid = fork())) {
 158         case -1:
 159                 err(1, "fork");
 160                 /* NOTREACHED */
 161
 162         case 0:
 163                 receiver();
 164                 break;
 165
 166         default:
 167                 break;
 168         }
 169
 170         /*
 171          * Suspend forever; when we get SIGCHLD, the handler will exit.
 172          */
 173         sigemptyset(&sigmask);
 174         (void) sigsuspend(&sigmask);
 175
 176         /*
 177          * ...and any other signal is an unexpected error.
 178          */
 179         errx(1, "sender: received unexpected signal");
 180 }
 181
 182 void
 183 sigsys_handler(signo)
 184         int signo;
 185 {
 186
 187         errx(1, "System V Shared Memory support is not present in the kernel");
 188 }
 189
 190 void
 191 sigchld_handler(signo)
 192         int signo;
 193 {
 194         struct shmid_ds s_ds;
 195         int cstatus;
 196
 197         /*
 198          * Reap the child; if it exited successfully, then the test passed!
 199          */
 200         if (waitpid(child_pid, &cstatus, 0) != child_pid)
 201                 err(1, "waitpid");
 202
 203         if (WIFEXITED(cstatus) == 0)
 204                 errx(1, "receiver exited abnormally");
 205
 206         if (WEXITSTATUS(cstatus) != 0)
 207                 errx(1, "receiver exited with status %d",
 208                     WEXITSTATUS(cstatus));
 209
 210         /*
 211          * If we get here, the child has exited normally, and thus
 212          * we should exit normally too.  First, tho, we print out
 213          * the final stats for the message queue.
 214          */
 215
 216         if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
 217                 err(1, "shmctl IPC_STAT");
 218
 219         print_shmid_ds(&s_ds, 0600);
 220
 221         exit(0);
 222 }
 223
 224 void
 225 cleanup()
 226 {
 227
 228         /*
 229          * If we're the sender, and it exists, remove the shared memory area.
 230          */
 231         if (child_pid != 0 && sender_shmid != -1) {
 232                 if (shmctl(sender_shmid, IPC_RMID, NULL) == -1)
 233                         warn("shmctl IPC_RMID");
 234         }
 235 }
 236
 237 void
 238 print_shmid_ds(sp, mode)
 239         struct shmid_ds *sp;
 240         mode_t mode;
 241 {
 242         uid_t uid = geteuid();
 243         gid_t gid = getegid();
 244
 245         printf("PERM: uid %d, gid %d, cuid %d, cgid %d, mode 0%o\n",
 246             sp->shm_perm.uid, sp->shm_perm.gid,
 247             sp->shm_perm.cuid, sp->shm_perm.cgid,
 248             sp->shm_perm.mode & 0777);
 249
 250         printf("segsz %lu, lpid %d, cpid %d, nattch %u\n",
 251             (u_long)sp->shm_segsz, sp->shm_lpid, sp->shm_cpid,
 252             sp->shm_nattch);
 253
 254         printf("atime: %s", ctime(&sp->shm_atime));
 255         printf("dtime: %s", ctime(&sp->shm_dtime));
 256         printf("ctime: %s", ctime(&sp->shm_ctime));
 257
 258         /*
 259          * Sanity check a few things.
 260          */
 261
 262         if (sp->shm_perm.uid != uid || sp->shm_perm.cuid != uid)
 263                 errx(1, "uid mismatch");
 264
 265         if (sp->shm_perm.gid != gid || sp->shm_perm.cgid != gid)
 266                 errx(1, "gid mismatch");
 267
 268         if ((sp->shm_perm.mode & 0777) != mode)
 269                 errx(1, "mode mismatch");
 270 }
 271
 272 void
 273 usage()
 274 {
 275
 276         fprintf(stderr, "usage: %s keypath\n", getprogname());
 277         exit(1);
 278 }
 279
 280 void
 281 receiver()
 282 {
 283         int shmid;
 284         void *shm_buf;
 285
 286         if ((shmid = shmget(shmkey, pgsize, 0)) == -1)
 287                 err(1, "receiver: shmget");
 288
 289         if ((shm_buf = shmat(shmid, NULL, 0)) == (void *) -1)
 290                 err(1, "receiver: shmat");
 291
 292         printf("%s\n", (const char *)shm_buf);
 293         if (strcmp((const char *)shm_buf, m_str) != 0)
 294                 err(1, "receiver: data isn't correct");
 295
 296         exit(0);
 297 }