NetBSD-5.0.2/regress/sys/kern/sysvshm/shmtest.c
/* $NetBSD: shmtest.c,v 1.5 2008/04/28 20:23:07 martin Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Test the SVID-compatible Shared Memory facility.
*/
#include <sys/param.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
int main(int, char *[]);
void print_shmid_ds(struct shmid_ds *, mode_t);
void sigsys_handler(int);
void sigchld_handler(int);
void cleanup(void);
void receiver(void);
void usage(void);
const char *m_str = "The quick brown fox jumped over the lazy dog.";
int sender_shmid = -1;
pid_t child_pid;
key_t shmkey;
size_t pgsize;
int
main(argc, argv)
int argc;
char *argv[];
{
struct sigaction sa;
struct shmid_ds s_ds;
sigset_t sigmask;
char *shm_buf;
if (argc != 2)
usage();
/*
* Install a SIGSYS handler so that we can exit gracefully if
* System V Shared Memory support isn't in the kernel.
*/
sa.sa_handler = sigsys_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if (sigaction(SIGSYS, &sa, NULL) == -1)
err(1, "sigaction SIGSYS");
/*
* Install and SIGCHLD handler to deal with all possible exit
* conditions of the receiver.
*/
sa.sa_handler = sigchld_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if (sigaction(SIGCHLD, &sa, NULL) == -1)
err(1, "sigaction SIGCHLD");
pgsize = sysconf(_SC_PAGESIZE);
shmkey = ftok(argv[1], 4160);
/*
* Initialize child_pid to ourselves to that the cleanup function
* works before we create the receiver.
*/
child_pid = getpid();
/*
* Make sure that when the sender exits, the message queue is
* removed.
*/
if (atexit(cleanup) == -1)
err(1, "atexit");
if ((sender_shmid = shmget(shmkey, pgsize, IPC_CREAT | 0640)) == -1)
err(1, "shmget");
if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
err(1, "shmctl IPC_STAT");
print_shmid_ds(&s_ds, 0640);
s_ds.shm_perm.mode = (s_ds.shm_perm.mode & ~0777) | 0600;
if (shmctl(sender_shmid, IPC_SET, &s_ds) == -1)
err(1, "shmctl IPC_SET");
memset(&s_ds, 0, sizeof(s_ds));
if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
err(1, "shmctl IPC_STAT");
if ((s_ds.shm_perm.mode & 0777) != 0600)
err(1, "IPC_SET of mode didn't hold");
print_shmid_ds(&s_ds, 0600);
if ((shm_buf = shmat(sender_shmid, NULL, 0)) == (void *) -1)
err(1, "sender: shmat");
/*
* Write the test pattern into the shared memory buffer.
*/
strcpy(shm_buf, m_str);
switch ((child_pid = fork())) {
case -1:
err(1, "fork");
/* NOTREACHED */
case 0:
receiver();
break;
default:
break;
}
/*
* Suspend forever; when we get SIGCHLD, the handler will exit.
*/
sigemptyset(&sigmask);
(void) sigsuspend(&sigmask);
/*
* ...and any other signal is an unexpected error.
*/
errx(1, "sender: received unexpected signal");
}
void
sigsys_handler(signo)
int signo;
{
errx(1, "System V Shared Memory support is not present in the kernel");
}
void
sigchld_handler(signo)
int signo;
{
struct shmid_ds s_ds;
int cstatus;
/*
* Reap the child; if it exited successfully, then the test passed!
*/
if (waitpid(child_pid, &cstatus, 0) != child_pid)
err(1, "waitpid");
if (WIFEXITED(cstatus) == 0)
errx(1, "receiver exited abnormally");
if (WEXITSTATUS(cstatus) != 0)
errx(1, "receiver exited with status %d",
WEXITSTATUS(cstatus));
/*
* If we get here, the child has exited normally, and thus
* we should exit normally too. First, tho, we print out
* the final stats for the message queue.
*/
if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
err(1, "shmctl IPC_STAT");
print_shmid_ds(&s_ds, 0600);
exit(0);
}
void
cleanup()
{
/*
* If we're the sender, and it exists, remove the shared memory area.
*/
if (child_pid != 0 && sender_shmid != -1) {
if (shmctl(sender_shmid, IPC_RMID, NULL) == -1)
warn("shmctl IPC_RMID");
}
}
void
print_shmid_ds(sp, mode)
struct shmid_ds *sp;
mode_t mode;
{
uid_t uid = geteuid();
gid_t gid = getegid();
printf("PERM: uid %d, gid %d, cuid %d, cgid %d, mode 0%o\n",
sp->shm_perm.uid, sp->shm_perm.gid,
sp->shm_perm.cuid, sp->shm_perm.cgid,
sp->shm_perm.mode & 0777);
printf("segsz %lu, lpid %d, cpid %d, nattch %u\n",
(u_long)sp->shm_segsz, sp->shm_lpid, sp->shm_cpid,
sp->shm_nattch);
printf("atime: %s", ctime(&sp->shm_atime));
printf("dtime: %s", ctime(&sp->shm_dtime));
printf("ctime: %s", ctime(&sp->shm_ctime));
/*
* Sanity check a few things.
*/
if (sp->shm_perm.uid != uid || sp->shm_perm.cuid != uid)
errx(1, "uid mismatch");
if (sp->shm_perm.gid != gid || sp->shm_perm.cgid != gid)
errx(1, "gid mismatch");
if ((sp->shm_perm.mode & 0777) != mode)
errx(1, "mode mismatch");
}
void
usage()
{
fprintf(stderr, "usage: %s keypath\n", getprogname());
exit(1);
}
void
receiver()
{
int shmid;
void *shm_buf;
if ((shmid = shmget(shmkey, pgsize, 0)) == -1)
err(1, "receiver: shmget");
if ((shm_buf = shmat(shmid, NULL, 0)) == (void *) -1)
err(1, "receiver: shmat");
printf("%s\n", (const char *)shm_buf);
if (strcmp((const char *)shm_buf, m_str) != 0)
err(1, "receiver: data isn't correct");
exit(0);
}