def METHOD_NAME():
    try:
        os.O_LARGEFILE
    except AttributeError:
        start_len = "ll"
    else:
        start_len = "qq"
    if (sys.platform.startswith(('netbsd', 'freebsd', 'openbsd'))
        or sys.platform == 'darwin'):
        if struct.calcsize('l') == 8:
            off_t = 'l'
            pid_t = 'i'
        else:
            off_t = 'lxxxx'
            pid_t = 'l'
        lockdata = struct.pack(off_t + off_t + pid_t + 'hh', 0, 0, 0,
                               fcntl.F_WRLCK, 0)
    elif sys.platform.startswith('gnukfreebsd'):
        lockdata = struct.pack('qqihhi', 0, 0, 0, fcntl.F_WRLCK, 0, 0)
    elif sys.platform in ['hp-uxB', 'unixware7']:
        lockdata = struct.pack('hhlllii', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
    else:
        lockdata = struct.pack('hh'+start_len+'hh', fcntl.F_WRLCK, 0, 0, 0, 0, 0)
    if lockdata:
        if verbose:
            print('struct.pack: ', repr(lockdata))
    return lockdata