mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-12-27 19:39:35 +03:00
a85a90557d
CID:147692, Type:Uninitialized scalar variable CID:147693, Type:Uninitialized scalar variable CID:147694, Type:Uninitialized scalar variable Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: cao.xuewen <cao.xuewen@zte.com.cn> Closes #5252
105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
/*
|
|
* CDDL HEADER START
|
|
*
|
|
* The contents of this file are subject to the terms of the
|
|
* Common Development and Distribution License (the "License").
|
|
* You may not use this file except in compliance with the License.
|
|
*
|
|
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
|
|
* or http://www.opensolaris.org/os/licensing.
|
|
* See the License for the specific language governing permissions
|
|
* and limitations under the License.
|
|
*
|
|
* When distributing Covered Code, include this CDDL HEADER in each
|
|
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
|
|
* If applicable, add the following below this CDDL HEADER, with the
|
|
* fields enclosed by brackets "[]" replaced with your own identifying
|
|
* information: Portions Copyright [yyyy] [name of copyright owner]
|
|
*
|
|
* CDDL HEADER END
|
|
*/
|
|
|
|
/*
|
|
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
|
|
* Use is subject to license terms.
|
|
*/
|
|
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/mman.h>
|
|
#include <pthread.h>
|
|
|
|
/*
|
|
* --------------------------------------------------------------------
|
|
* Bug Id: 5032643
|
|
*
|
|
* Simply writing to a file and mmaping that file at the same time can
|
|
* result in deadlock. Nothing perverse like writing from the file's
|
|
* own mapping is required.
|
|
* --------------------------------------------------------------------
|
|
*/
|
|
|
|
static void *
|
|
mapper(void *fdp)
|
|
{
|
|
void *addr;
|
|
int fd = *(int *)fdp;
|
|
|
|
if ((addr =
|
|
mmap(0, 8192, PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED) {
|
|
perror("mmap");
|
|
exit(1);
|
|
}
|
|
for (;;) {
|
|
if (mmap(addr, 8192, PROT_READ,
|
|
MAP_SHARED|MAP_FIXED, fd, 0) == MAP_FAILED) {
|
|
perror("mmap");
|
|
exit(1);
|
|
}
|
|
}
|
|
/* NOTREACHED */
|
|
return ((void *)1);
|
|
}
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
int fd;
|
|
char buf[1024];
|
|
pthread_t tid;
|
|
|
|
memset(buf, 'a', sizeof (buf));
|
|
|
|
if (argc != 2) {
|
|
(void) printf("usage: %s <file name>\n", argv[0]);
|
|
exit(1);
|
|
}
|
|
|
|
if ((fd = open(argv[1], O_RDWR|O_CREAT|O_TRUNC, 0666)) == -1) {
|
|
perror("open");
|
|
exit(1);
|
|
}
|
|
|
|
(void) pthread_setconcurrency(2);
|
|
if (pthread_create(&tid, NULL, mapper, &fd) != 0) {
|
|
perror("pthread_create");
|
|
close(fd);
|
|
exit(1);
|
|
}
|
|
for (;;) {
|
|
if (write(fd, buf, sizeof (buf)) == -1) {
|
|
perror("write");
|
|
close(fd);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
close(fd);
|
|
|
|
/* NOTREACHED */
|
|
return (0);
|
|
}
|