139 lines
2.9 KiB
C
139 lines
2.9 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.
|
|
*/
|
|
|
|
/*
|
|
* --------------------------------------------------------------
|
|
* BugId 5047993 : Getting bad read data.
|
|
*
|
|
* Usage: readmmap <filename>
|
|
*
|
|
* where:
|
|
* filename is an absolute path to the file name.
|
|
*
|
|
* Return values:
|
|
* 1 : error
|
|
* 0 : no errors
|
|
* --------------------------------------------------------------
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
#include <sys/mman.h>
|
|
#include <time.h>
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
char *filename = "badfile";
|
|
size_t size = 4395;
|
|
size_t idx = 0;
|
|
char *buf = NULL;
|
|
char *map = NULL;
|
|
int fd = -1, bytes, retval = 0;
|
|
unsigned seed;
|
|
|
|
if (argc < 2 || optind == argc) {
|
|
(void) fprintf(stderr,
|
|
"usage: %s <file name>\n", argv[0]);
|
|
exit(1);
|
|
}
|
|
|
|
if ((buf = calloc(1, size)) == NULL) {
|
|
perror("calloc");
|
|
exit(1);
|
|
}
|
|
|
|
filename = argv[optind];
|
|
|
|
(void) remove(filename);
|
|
|
|
fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0666);
|
|
if (fd == -1) {
|
|
perror("open to create");
|
|
retval = 1;
|
|
goto end;
|
|
}
|
|
|
|
bytes = write(fd, buf, size);
|
|
if (bytes != size) {
|
|
(void) printf("short write: %d != %zd\n", bytes, size);
|
|
retval = 1;
|
|
goto end;
|
|
}
|
|
|
|
map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
|
|
if (map == MAP_FAILED) {
|
|
perror("mmap");
|
|
retval = 1;
|
|
goto end;
|
|
}
|
|
seed = time(NULL);
|
|
srandom(seed);
|
|
|
|
idx = random() % size;
|
|
map[idx] = 1;
|
|
|
|
if (msync(map, size, MS_SYNC) != 0) {
|
|
perror("msync");
|
|
retval = 1;
|
|
goto end;
|
|
}
|
|
|
|
if (munmap(map, size) != 0) {
|
|
perror("munmap");
|
|
retval = 1;
|
|
goto end;
|
|
}
|
|
|
|
bytes = pread(fd, buf, size, 0);
|
|
if (bytes != size) {
|
|
(void) printf("short read: %d != %zd\n", bytes, size);
|
|
retval = 1;
|
|
goto end;
|
|
}
|
|
|
|
if (buf[idx] != 1) {
|
|
(void) printf(
|
|
"bad data from read! got buf[%zd]=%d, expected 1\n",
|
|
idx, buf[idx]);
|
|
retval = 1;
|
|
goto end;
|
|
}
|
|
|
|
(void) printf("good data from read: buf[%zd]=1\n", idx);
|
|
end:
|
|
if (fd != -1) {
|
|
(void) close(fd);
|
|
}
|
|
if (buf != NULL) {
|
|
free(buf);
|
|
}
|
|
|
|
return (retval);
|
|
}
|