Function lseek

components/dfs/dfs_v2/src/dfs_posix.c:420–442

* this function is a POSIX compliant version, which will Reposition the file offset for * an open file descriptor. * * The `lseek` function sets the file offset for the file descriptor `fd` * to a new value, determined by the `offset` and `whence` parameters. * It can be used to seek to specific positions in a file for reading or writing. * * @param fd the file descriptor. * @param offset

 * @return the resulting read/write position in the file, or -1 on failed.
 */
off_t lseek(int fd, off_t offset, int whence)
{
    off_t result;
    struct dfs_file *file;

    file = fd_get(fd);
    if (file == NULL)
    {
        rt_set_errno(-EBADF);

        return -1;
    }

    result = dfs_file_lseek(file, offset, whence);
    if (result < 0)
    {
        rt_set_errno(-EPERM);

        return -1;
    }

    return result;
}
RTM_EXPORT(lseek);

/**