source: MondoRescue/branches/stable/mindi-busybox/e2fsprogs/ext2fs/getsectsize.c@ 821

/*
 * getsectsize.c --- get the sector size of a device.
 *
 * Copyright (C) 1995, 1995 Theodore Ts'o.
 * Copyright (C) 2003 VMware, Inc.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#include <stdio.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#include <fcntl.h>
#ifdef HAVE_LINUX_FD_H
#include <sys/ioctl.h>
#include <linux/fd.h>
#endif

#if defined(__linux__) && defined(_IO) && !defined(BLKSSZGET)
#define BLKSSZGET  _IO(0x12,104)/* get block device sector size */
#endif

#include "ext2_fs.h"
#include "ext2fs.h"

/*
 * Returns the number of blocks in a partition
 */
errcode_t ext2fs_get_device_sectsize(const char *file, int *sectsize)
{
    int fd;

#ifdef CONFIG_LFS
    fd = open64(file, O_RDONLY);
#else
    fd = open(file, O_RDONLY);
#endif
    if (fd < 0)
        return errno;

#ifdef BLKSSZGET
    if (ioctl(fd, BLKSSZGET, sectsize) >= 0) {
        close(fd);
        return 0;
    }
#endif
    *sectsize = 0;
    close(fd);
    return 0;
}