file_ptr

    A file pointer.

 offset

    The offset, specified in bytes.

 direction

    An integer indicating the position to which the offset is added
    to calculate the new position. The new position is the beginning
    of the file if direction is SEEK_SET, the current value of the
    file position indicator if direction is SEEK_CUR, or end-of-file
    if direction is SEEK_END.