2.9BSD/usr/include/sys/vcmd.h

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#define	VPRINT		0100
#define	VPLOT		0200
#define	VPRINTPLOT	0400

#define	GETSTATE	(('v'<<8)|0)
#define	SETSTATE	(('v'<<8)|1)
#define	BUFWRITE	(('v'<<8)|2)	/* async write */