snoop.h revision 35256 
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 _SYS_SNOOP_H_
17#define	_SYS_SNOOP_H_
18
19#ifndef KERNEL
20#include <sys/types.h>
21#endif
22#include <sys/ioccom.h>
23
24#ifdef KERNEL
25#define SNOOP_MINLEN		(4*1024)	/* This should be power of 2.
26						 * 4K tested to be the minimum
27						 * for which on normal tty
28						 * usage there is no need to
29						 * allocate more.
30						 */
31#define SNOOP_MAXLEN		(64*1024)	/* This one also,64K enough
32						 * If we grow more,something
33						 * really bad in this world..
34						 */
35
36/*
37 * This is the main snoop per-device
38 * structure...
39 */
40
41struct snoop {
42	dev_t		snp_target;	/* major/minor number of device*/
43	struct tty	*snp_tty;	/* tty device pointer	       */
44	u_long 		snp_len;	/* buffer data length	       */
45	u_long		snp_base;	/* buffer data base	       */
46	u_long		snp_blen;	/* Overall buffer len	       */
47	caddr_t		snp_buf;	/* Data buffer		       */
48	int 		snp_flags;	/* Flags place		       */
49#define SNOOP_ASYNC		0x0002
50#define SNOOP_OPEN		0x0004
51#define SNOOP_RWAIT		0x0008
52#define SNOOP_OFLOW		0x0010
53#define SNOOP_DOWN		0x0020
54	struct selinfo	snp_sel;	/* Selection info	       */
55};
56
57/* XXX several wrong storage classes and types here. */
58int	snpdown __P((struct snoop *snp));
59int	snpin __P((struct snoop *snp, char *buf, int n));
60int	snpinc __P((struct snoop *snp, char c));
61#endif /* KERNEL */
62
63/*
64 * Theese are snoop io controls
65 * SNPSTTY accepts 'struct snptty' as input.
66 * If ever type or  unit set to -1,snoop device
67 * detached from its current tty.
68 */
69
70#define SNPSTTY       _IOW('T', 90, dev_t)
71#define SNPGTTY       _IOR('T', 89, dev_t)
72
73/*
74 * Theese values would be returned by FIONREAD ioctl
75 * instead of number of characters in buffer in case
76 * of specific errors.
77 */
78#define SNP_OFLOW		-1
79#define SNP_TTYCLOSE		-2
80#define SNP_DETACH		-3
81
82#endif /* !_SYS_SNOOP_H_ */
83