snoop.h revision 12819 
1/*
2 * Copyright (c) 1995 Ugen J.S.Antsilevich
3 *
4 * Redistribution and use in source forms, with and without modification,
5 * are permitted provided that this entire comment appears intact.
6 *
7 * Redistribution in binary form may occur without any restrictions.
8 * Obviously, it would be nice if you gave credit where credit is due
9 * but requiring it would be too onerous.
10 *
11 * This software is provided ``AS IS'' without any warranties of any kind.
12 *
13 * Snoop stuff.
14 */
15
16#ifndef _SNOOP_H_
17#define	_SNOOP_H_
18
19#define SNOOP_MINLEN		(4*1024)	/* This should be power of 2.
20						 * 4K tested to be the minimum
21						 * for which on normal tty
22						 * usage there is no need to
23						 * allocate more.
24						 */
25#define SNOOP_MAXLEN		(64*1024)	/* This one also,64K enough
26						 * If we grow more,something
27						 * really bad in this world..
28						 */
29
30/*
31 * This is the main snoop per-device
32 * structure...
33 */
34
35struct snoop {
36	dev_t		snp_target;	/* major/minor number of device*/
37	struct tty	*snp_tty;	/* tty device pointer	       */
38	u_long 		snp_len;	/* buffer data length	       */
39	u_long		snp_base;	/* buffer data base	       */
40	u_long		snp_blen;	/* Overall buffer len	       */
41	caddr_t		snp_buf;	/* Data buffer		       */
42	int 		snp_flags;	/* Flags place		       */
43#define SNOOP_NBIO		0x0001
44#define SNOOP_ASYNC		0x0002
45#define SNOOP_OPEN		0x0004
46#define SNOOP_RWAIT		0x0008
47#define SNOOP_OFLOW		0x0010
48#define SNOOP_DOWN		0x0020
49	struct selinfo	snp_sel;	/* Selection info	       */
50};
51
52/*
53 * Theese are snoop io controls
54 * SNPSTTY accepts 'struct snptty' as input.
55 * If ever type or  unit set to -1,snoop device
56 * detached from it's current tty.
57 */
58
59#define SNPSTTY       _IOW('T', 90, dev_t)
60#define SNPGTTY       _IOR('T', 89, dev_t)
61
62/*
63 * Theese values would be returned by FIONREAD ioctl
64 * instead of number of characters in buffer in case
65 * of specific errors.
66 */
67#define SNP_OFLOW		-1
68#define SNP_TTYCLOSE		-2
69#define SNP_DETACH		-3
70
71#ifdef KERNEL
72/* XXX several wrong storage classes and types here. */
73int	snpdown __P((struct snoop *snp));
74int	snpin __P((struct snoop *snp, char *buf, int n));
75int	snpinc __P((struct snoop *snp, char c));
76#endif /* KERNEL */
77
78#endif /* _SNOOP_H_ */
79