const (
	np2000	= "9P2000"
	msize	= 4194304:u32	# 4*1024*1024
	notag	= -1:u16
	nofid	= -1:u32

	QTDIR	= 0x80
	# ...
	QTFILE	= 0x0

	OREAD	= 0
	OWRITE	= 1
	ORDWR	= 2
	OEXEC	= 3
	OTRUNC	= 16
	ORCLOSE	= 64

	Tversion	= 100:u8
	Rversion	= 101:u8
	Tauth		= 102:u8
	Rauth		= 103:u8
	Tattach		= 104:u8
	Rattach		= 105:u8
	Terror		= 106:u8 # illegal
	Rerror		= 107:u8
	Tflush		= 108:u8
	Rflush		= 109:u8
	Twalk		= 110:u8
	Rwalk		= 111:u8
	Topen		= 112:u8
	Ropen		= 113:u8
	Tcreate		= 114:u8
	Rcreate		= 115:u8
	Tread		= 116:u8
	Rread		= 117:u8
	Twrite		= 118:u8
	Rwrite		= 119:u8
	Tclunk		= 120:u8
	Rclunk		= 121:u8
	Tremove		= 122:u8
	Rremove		= 123:u8
	Tstat		= 124:u8
	Rstat		= 125:u8
	Twstat		= 126:u8
	Rwstat		= 127:u8
)