/* * six-byte packet header for asynch lines. * headers for other devices take up the same * or less space.  If this changes the header * struct will have to become a union. */struct header {	char	sync;		/* sync byte */	char	ksize;		/* encoded packet size */	unsigned short sum;	/* block check of data packet */	char	cntl;		/* control byte */	char	ccntl;		/* block check of header */};#define	HDRSIZ	6/* * Control structure for a packet driver connection. */struct pack {	short	p_state;	/* line state */	short	p_bits;		/* mask for getepack */	short	p_rsize;	/* input packet size */	short	p_xsize;	/* output packet size */	struct	header p_ihbuf;	/* input header */	struct	header p_ohbuf; /* output header */	char	*p_rptr;	char	p_mode;	char	**p_ipool;	/* head link to input buffer pool */	char	**p_io;		/* input buffer given to driver */	char	p_xcount;	/* # active output buffers */	char	p_rcount;	char	p_nout,p_tout;	char	p_lpsize;	/* log(psize/32) */	char	p_timer;	char	p_obusy;	char	p_srxmit;	char	p_rwindow;	/* window size */	char	p_swindow;	char	p_msg;		/* control msg */	char	p_rmsg;		/* repeated control msg */	char	p_ps,p_pr;	/* last packet sent, recv'd */	char	p_rpr;		/* copy of remote pr */	char	p_nxtps;	/* next output seq number */	char	p_imap;		/* bit map of input buffers */	char	p_pscopy;	/* newest output packet */	char	*p_ob[8];	/* output buffers */	char	*p_ib[8];	/* input buffers */	char	p_os[8];	/* output buffer status */	char	p_is[8];	/* input buffer status */	short	p_osum[8];	/* output checksums */	short	p_isum[8];	/* input checksums */	DSYSTEM;};#define	CHECK	0125252#define	SYN	020#define	MOD8	7#define	NOTCNTL(a)	(a & 0300)#define	MIN(a,b)	((a<b)? a:b)char	next[8];char	mask[8];int	npbits;int	pkactive;int	pkzot;int	pkdisc;/* * driver state */#define	DEAD	0#define	INITa	1#define	INITb	2#define	INITab	3#define	LIVE	010#define	RXMIT	020#define	RREJ	040#define PDEBUG	0200#define	DRAINO	0400#define	WAITO	01000#define	DOWN	02000#define	RCLOSE	04000#define	BADFRAME 020000/* * modes */#define	SLOWMODE	0100/* * io buffer states */#define	B_NULL	0#define	B_READY	1#define	B_SENT	2#define	B_RESID	010#define	B_COPY	020#define	B_MARK	040#define	B_SHORT	0100/* * control messages */#define	CLOSE	1#define	RJ	2#define	SRJ	3#define	RR	4#define	INITC	5#define	INITB	6#define	INITA	7#define	M_RJ	4#define	M_SRJ	010#define	M_RR	020#define	M_INITC	040#define	M_CLOSE	2#define	M_INITA	0200#define	M_INITB	0100#define	PKOPRI	31#define	PKIPRI	30#define	NPLINES	8/* * packet ioctl buf */struct	piocb {	unsigned t;	short	psize;	short	mode;	short	state;	char	window;};int pkdebug;int pksizes[];#define	Pwrite	1#define	Poutput	1#define	Pxint	1#define	Print	01#define	Prend	01#define	Pacc	01#define	Pread	01int	*PTRACE;