'SSH2_FXF_READ' => 0x01,
    'SSH2_FXF_WRITE' => 0x02,
    'SSH2_FXF_APPEND' => 0x04,
    'SSH2_FXF_CREAT' => 0x08,
    'SSH2_FXF_TRUNC' => 0x10,
    'SSH2_FXF_EXCL' => 0x20,