298 lines
7.1 KiB
C
298 lines
7.1 KiB
C
/*-
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* Obtained from: $NetBSD: shmtest.c,v 1.3 2002/07/20 08:36:26 grant Exp $
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* $FreeBSD$
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*/
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/*
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* Test the SVID-compatible Shared Memory facility.
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*/
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#include <sys/param.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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int main __P((int, char *[]));
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void print_shmid_ds __P((struct shmid_ds *, mode_t));
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void sigsys_handler __P((int));
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void sigchld_handler __P((int));
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void cleanup __P((void));
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void receiver __P((void));
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void usage __P((void));
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const char *m_str = "The quick brown fox jumped over the lazy dog.";
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int sender_shmid = -1;
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pid_t child_pid;
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key_t shmkey;
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size_t pgsize;
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct sigaction sa;
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struct shmid_ds s_ds;
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sigset_t sigmask;
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char *shm_buf;
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if (argc != 2)
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usage();
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/*
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* Install a SIGSYS handler so that we can exit gracefully if
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* System V Shared Memory support isn't in the kernel.
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*/
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sa.sa_handler = sigsys_handler;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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if (sigaction(SIGSYS, &sa, NULL) == -1)
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err(1, "sigaction SIGSYS");
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/*
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* Install and SIGCHLD handler to deal with all possible exit
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* conditions of the receiver.
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*/
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sa.sa_handler = sigchld_handler;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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if (sigaction(SIGCHLD, &sa, NULL) == -1)
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err(1, "sigaction SIGCHLD");
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pgsize = sysconf(_SC_PAGESIZE);
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shmkey = ftok(argv[1], 4160);
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/*
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* Initialize child_pid to ourselves to that the cleanup function
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* works before we create the receiver.
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*/
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child_pid = getpid();
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/*
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* Make sure that when the sender exits, the message queue is
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* removed.
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*/
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if (atexit(cleanup) == -1)
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err(1, "atexit");
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if ((sender_shmid = shmget(shmkey, pgsize, IPC_CREAT | 0640)) == -1)
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err(1, "shmget");
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if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
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err(1, "shmctl IPC_STAT");
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print_shmid_ds(&s_ds, 0640);
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s_ds.shm_perm.mode = (s_ds.shm_perm.mode & ~0777) | 0600;
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if (shmctl(sender_shmid, IPC_SET, &s_ds) == -1)
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err(1, "shmctl IPC_SET");
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memset(&s_ds, 0, sizeof(s_ds));
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if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
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err(1, "shmctl IPC_STAT");
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if ((s_ds.shm_perm.mode & 0777) != 0600)
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err(1, "IPC_SET of mode didn't hold");
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print_shmid_ds(&s_ds, 0600);
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if ((shm_buf = shmat(sender_shmid, NULL, 0)) == (void *) -1)
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err(1, "sender: shmat");
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/*
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* Write the test pattern into the shared memory buffer.
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*/
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strcpy(shm_buf, m_str);
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switch ((child_pid = fork())) {
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case -1:
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err(1, "fork");
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/* NOTREACHED */
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case 0:
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receiver();
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break;
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default:
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break;
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}
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/*
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* Suspend forever; when we get SIGCHLD, the handler will exit.
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*/
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sigemptyset(&sigmask);
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(void) sigsuspend(&sigmask);
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/*
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* ...and any other signal is an unexpected error.
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*/
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errx(1, "sender: received unexpected signal");
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}
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void
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sigsys_handler(signo)
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int signo;
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{
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errx(1, "System V Shared Memory support is not present in the kernel");
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}
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void
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sigchld_handler(signo)
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int signo;
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{
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struct shmid_ds s_ds;
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int cstatus;
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/*
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* Reap the child; if it exited successfully, then the test passed!
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*/
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if (waitpid(child_pid, &cstatus, 0) != child_pid)
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err(1, "waitpid");
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if (WIFEXITED(cstatus) == 0)
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errx(1, "receiver exited abnormally");
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if (WEXITSTATUS(cstatus) != 0)
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errx(1, "receiver exited with status %d",
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WEXITSTATUS(cstatus));
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/*
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* If we get here, the child has exited normally, and thus
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* we should exit normally too. First, tho, we print out
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* the final stats for the message queue.
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*/
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if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
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err(1, "shmctl IPC_STAT");
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print_shmid_ds(&s_ds, 0600);
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exit(0);
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}
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void
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cleanup()
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{
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/*
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* If we're the sender, and it exists, remove the shared memory area.
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*/
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if (child_pid != 0 && sender_shmid != -1) {
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if (shmctl(sender_shmid, IPC_RMID, NULL) == -1)
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warn("shmctl IPC_RMID");
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}
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}
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void
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print_shmid_ds(sp, mode)
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struct shmid_ds *sp;
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mode_t mode;
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{
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uid_t uid = geteuid();
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gid_t gid = getegid();
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printf("PERM: uid %d, gid %d, cuid %d, cgid %d, mode 0%o\n",
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sp->shm_perm.uid, sp->shm_perm.gid,
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sp->shm_perm.cuid, sp->shm_perm.cgid,
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sp->shm_perm.mode & 0777);
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printf("segsz %lu, lpid %d, cpid %d, nattch %u\n",
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(u_long)sp->shm_segsz, sp->shm_lpid, sp->shm_cpid,
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sp->shm_nattch);
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printf("atime: %s", ctime(&sp->shm_atime));
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printf("dtime: %s", ctime(&sp->shm_dtime));
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printf("ctime: %s", ctime(&sp->shm_ctime));
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/*
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* Sanity check a few things.
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*/
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if (sp->shm_perm.uid != uid || sp->shm_perm.cuid != uid)
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errx(1, "uid mismatch");
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if (sp->shm_perm.gid != gid || sp->shm_perm.cgid != gid)
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errx(1, "gid mismatch");
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if ((sp->shm_perm.mode & 0777) != mode)
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errx(1, "mode mismatch");
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}
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void
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usage()
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{
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fprintf(stderr, "usage: %s keypath\n", getprogname());
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exit(1);
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}
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void
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receiver()
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{
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int shmid;
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void *shm_buf;
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if ((shmid = shmget(shmkey, pgsize, 0)) == -1)
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err(1, "receiver: shmget");
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if ((shm_buf = shmat(shmid, NULL, 0)) == (void *) -1)
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err(1, "receiver: shmat");
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printf("%s\n", (const char *)shm_buf);
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if (strcmp((const char *)shm_buf, m_str) != 0)
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err(1, "receiver: data isn't correct");
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exit(0);
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}
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