d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy/*
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * CDDL HEADER START
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * The contents of this file are subject to the terms of the
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * Common Development and Distribution License (the "License").
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * You may not use this file except in compliance with the License.
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * or http://www.opensolaris.org/os/licensing.
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * See the License for the specific language governing permissions
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * and limitations under the License.
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * When distributing Covered Code, include this CDDL HEADER in each
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * If applicable, add the following below this CDDL HEADER, with the
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * fields enclosed by brackets "[]" replaced with your own identifying
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * information: Portions Copyright [yyyy] [name of copyright owner]
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * CDDL HEADER END
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy */
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy/*
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * Use is subject to license terms.
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy */
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy#include <unistd.h>
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy#include <fcntl.h>
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy#include <stdio.h>
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy#include <stdlib.h>
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy#include <sys/mman.h>
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy#include <pthread.h>
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy/*
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * --------------------------------------------------------------------
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * Bug Id: 5032643
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * Simply writing to a file and mmaping that file at the same time can
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * result in deadlock. Nothing perverse like writing from the file's
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * own mapping is required.
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * --------------------------------------------------------------------
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy */
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedystatic void *
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedymapper(void *fdp)
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy{
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy void *addr;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy int fd = *(int *)fdp;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy if ((addr =
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy mmap(0, 8192, PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy perror("mmap");
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy exit(1);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy for (;;) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy if (mmap(addr, 8192, PROT_READ,
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy MAP_SHARED|MAP_FIXED, fd, 0) == MAP_FAILED) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy perror("mmap");
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy exit(1);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy /* NOTREACHED */
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy return ((void *)1);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy}
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedyint
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedymain(int argc, char **argv)
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy{
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy int fd;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy char buf[BUFSIZ];
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy if (argc != 2) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy (void) printf("usage: %s <file name>\n", argv[0]);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy exit(1);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy if ((fd = open(argv[1], O_RDWR|O_CREAT|O_TRUNC, 0666)) == -1) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy perror("open");
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy exit(1);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy if (pthread_create(NULL, NULL, mapper, &fd) != 0) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy perror("pthread_create");
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy exit(1);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy for (;;) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy if (write(fd, buf, sizeof (buf)) == -1) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy perror("write");
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy exit(1);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy /* NOTREACHED */
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy return (0);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy}