busybox

/*

 * llseek.c -- stub calling the llseek system call

 *

 * Copyright (C) 1994, 1995, 1996, 1997 Theodore Ts'o.

 *

 * %Begin-Header%

 * This file may be redistributed under the terms of the

 * GNU Lesser General Public License.

 * %End-Header%

 */

​

#if HAVE_SYS_TYPES_H

#include <sys/types.h>

#endif

​

#if HAVE_ERRNO_H

#include <errno.h>

#endif

#if HAVE_UNISTD_H

#include <unistd.h>

#endif

​

#include "blkidP.h"

​

#ifdef CONFIG_LFS

# define my_llseek lseek64

#else

# define my_llseek lseek

#endif

​

blkid_loff_t blkid_llseek(int fd, blkid_loff_t offset, int whence)

{

    blkid_loff_t result;

    static int do_compat = 0;

​

    if ((sizeof(off_t) >= sizeof(blkid_loff_t)) ||

        (offset < ((blkid_loff_t) 1 << ((sizeof(off_t)*8) -1))))

        return lseek(fd, (off_t) offset, whence);

​

    if (do_compat) {

        errno = EOVERFLOW;

        return -1;

    }

​

    result = my_llseek(fd, offset, whence);

    if (result == -1 && errno == ENOSYS) {

        /*

         * Just in case this code runs on top of an old kernel

         * which does not support the llseek system call

         */

        do_compat++;

        errno = EOVERFLOW;

    }

    return result;

}