cmd/readmmap/readmmap.c

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/*
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * --------------------------------------------------------------
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *  BugId 5047993 : Getting bad read data.
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *  Usage: readmmap <filename>
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *  where:
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *      filename is an absolute path to the file name.
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *  Return values:
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *      1 : error
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy *      0 : no errors
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy * --------------------------------------------------------------
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy */
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy#include <stdio.h>
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy#include <stdlib.h>
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy#include <unistd.h>
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy#include <fcntl.h>
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy#include <errno.h>
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy#include <sys/mman.h>
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedyint
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedymain(int argc, char **argv)
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy{
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    char *filename = "badfile";
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    size_t size = 4395;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    size_t idx = 0;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    char *buf = NULL;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    char *map = NULL;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    int fd = -1, bytes, retval = 0;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    unsigned seed;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    if (argc < 2 || optind == argc) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        (void) fprintf(stderr,
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy            "usage: %s <file name>\n", argv[0]);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        exit(1);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    if ((buf = calloc(1, size)) == NULL) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        perror("calloc");
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        exit(1);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    filename = argv[optind];
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    (void) remove(filename);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0666);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    if (fd == -1) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        perror("open to create");
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        retval = 1;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        goto end;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    bytes = write(fd, buf, size);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    if (bytes != size) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        (void) printf("short write: %d != %ud\n", bytes, size);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        retval = 1;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        goto end;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    if (map == MAP_FAILED) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        perror("mmap");
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        retval = 1;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        goto end;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    seed = time(NULL);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    srandom(seed);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    idx = random() % size;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    map[idx] = 1;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    if (msync(map, size, MS_SYNC) != 0) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        perror("msync");
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        retval = 1;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        goto end;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    if (munmap(map, size) != 0) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        perror("munmap");
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        retval = 1;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        goto end;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    bytes = pread(fd, buf, size, 0);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    if (bytes != size) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        (void) printf("short read: %d != %ud\n", bytes, size);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        retval = 1;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        goto end;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    if (buf[idx] != 1) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        (void) printf(
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy            "bad data from read!  got buf[%ud]=%d, expected 1\n",
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy            idx, buf[idx]);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        retval = 1;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        goto end;
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    (void) printf("good data from read: buf[%ud]=1\n", idx);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedyend:
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    if (fd != -1) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        (void) close(fd);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    if (buf != NULL) {
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy        free(buf);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    }
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy    return (retval);
d583b39bfb4e2571d3e41097c5c357ffe353ad45John Wren Kennedy}