misc.py 文件源码

def fsbsize(path):
    """
    Get optimal file system buffer size (in bytes) for I/O calls
    """
    path = encode(path)

    if os.name == "nt":
        import ctypes

        drive = "%s\\" % os.path.splitdrive(path)[0]
        cluster_sectors, sector_size = ctypes.c_longlong(0)

        ctypes.windll.kernel32.GetDiskFreeSpaceW(ctypes.c_wchar_p(drive),
                                                 ctypes.pointer(
                                                     cluster_sectors),
                                                 ctypes.pointer(sector_size),
                                                 None,
                                                 None)
        return cluster_sectors * sector_size

    else:
        return os.statvfs(path).f_frsize