139 lines
2.9 KiB
C
139 lines
2.9 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* --------------------------------------------------------------
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* BugId 5047993 : Getting bad read data.
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*
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* Usage: readmmap <filename>
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*
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* where:
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* filename is an absolute path to the file name.
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*
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* Return values:
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* 1 : error
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* 0 : no errors
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* --------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <time.h>
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int
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main(int argc, char **argv)
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{
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char *filename = "badfile";
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size_t size = 4395;
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size_t idx = 0;
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char *buf = NULL;
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char *map = NULL;
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int fd = -1, bytes, retval = 0;
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unsigned seed;
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if (argc < 2 || optind == argc) {
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(void) fprintf(stderr,
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"usage: %s <file name>\n", argv[0]);
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exit(1);
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}
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if ((buf = calloc(1, size)) == NULL) {
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perror("calloc");
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exit(1);
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}
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filename = argv[optind];
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(void) remove(filename);
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fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0666);
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if (fd == -1) {
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perror("open to create");
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retval = 1;
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goto end;
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}
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bytes = write(fd, buf, size);
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if (bytes != size) {
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(void) printf("short write: %d != %zd\n", bytes, size);
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retval = 1;
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goto end;
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}
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map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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if (map == MAP_FAILED) {
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perror("mmap");
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retval = 1;
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goto end;
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}
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seed = time(NULL);
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srandom(seed);
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idx = random() % size;
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map[idx] = 1;
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if (msync(map, size, MS_SYNC) != 0) {
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perror("msync");
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retval = 1;
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goto end;
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}
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if (munmap(map, size) != 0) {
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perror("munmap");
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retval = 1;
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goto end;
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}
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bytes = pread(fd, buf, size, 0);
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if (bytes != size) {
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(void) printf("short read: %d != %zd\n", bytes, size);
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retval = 1;
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goto end;
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}
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if (buf[idx] != 1) {
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(void) printf(
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"bad data from read! got buf[%zd]=%d, expected 1\n",
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idx, buf[idx]);
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retval = 1;
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goto end;
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}
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(void) printf("good data from read: buf[%zd]=1\n", idx);
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end:
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if (fd != -1) {
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(void) close(fd);
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}
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if (buf != NULL) {
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free(buf);
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}
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return (retval);
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}
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