snoop.h revision 77106 
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 * $FreeBSD: head/sys/sys/snoop.h 77106 2001-05-24 00:43:44Z dd $
16 */
17
18#ifndef _SYS_SNOOP_H_
19#define	_SYS_SNOOP_H_
20
21#ifndef _KERNEL
22#include <sys/types.h>
23#endif
24#include <sys/ioccom.h>
25
26#ifdef _KERNEL
27#define SNOOP_MINLEN		(4*1024)	/* This should be power of 2.
28						 * 4K tested to be the minimum
29						 * for which on normal tty
30						 * usage there is no need to
31						 * allocate more.
32						 */
33#define SNOOP_MAXLEN		(64*1024)	/* This one also,64K enough
34						 * If we grow more,something
35						 * really bad in this world..
36						 */
37
38/*
39 * This is the main snoop per-device
40 * structure...
41 */
42
43struct snoop {
44	dev_t		snp_target;	/* major/minor number of device*/
45	struct tty	*snp_tty;	/* tty device pointer	       */
46	u_long 		snp_len;	/* buffer data length	       */
47	u_long		snp_base;	/* buffer data base	       */
48	u_long		snp_blen;	/* Overall buffer len	       */
49	caddr_t		snp_buf;	/* Data buffer		       */
50	int 		snp_flags;	/* Flags place		       */
51#define SNOOP_ASYNC		0x0002
52#define SNOOP_OPEN		0x0004
53#define SNOOP_RWAIT		0x0008
54#define SNOOP_OFLOW		0x0010
55#define SNOOP_DOWN		0x0020
56	struct selinfo	snp_sel;	/* Selection info	       */
57	int		snp_olddisc;	/* Old line discipline	       */
58};
59
60/* XXX several wrong storage classes and types here. */
61int	snpdown __P((struct snoop *snp));
62int	snpin __P((struct snoop *snp, char *buf, int n));
63int	snpinc __P((struct snoop *snp, char c));
64#endif /* _KERNEL */
65
66/*
67 * Theese are snoop io controls
68 * SNPSTTY accepts 'struct snptty' as input.
69 * If ever type or  unit set to -1,snoop device
70 * detached from its current tty.
71 */
72
73#define SNPSTTY       _IOW('T', 90, dev_t)
74#define SNPGTTY       _IOR('T', 89, dev_t)
75
76/*
77 * Theese values would be returned by FIONREAD ioctl
78 * instead of number of characters in buffer in case
79 * of specific errors.
80 */
81#define SNP_OFLOW		-1
82#define SNP_TTYCLOSE		-2
83#define SNP_DETACH		-3
84
85#endif /* !_SYS_SNOOP_H_ */
86