FreeBSD/Linux Kernel Cross Reference
sys/sys/snoop.h
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
41 struct 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. */
58 int snpdown __P((struct snoop *snp));
59 int snpin __P((struct snoop *snp, char *buf, int n));
60 int 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_ */
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