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/*
* Copyright (c) 1995 Ugen J.S.Antsilevich
*
* Redistribution and use in source forms, with and without modification,
* are permitted provided that this entire comment appears intact.
*
* Redistribution in binary form may occur without any restrictions.
* Obviously, it would be nice if you gave credit where credit is due
* but requiring it would be too onerous.
*
* This software is provided ``AS IS'' without any warranties of any kind.
*
* Snoop stuff.
*/
#ifndef SNOOP_H
#define SNOOP_H
#define SNOOP_MINLEN (4*1024) /* This should be power of 2.
* 4K tested to be the minimum
* for which on normal tty
* usage there is no need to
* allocate more.
*/
#define SNOOP_MAXLEN (64*1024) /* This one also,64K enough
* If we grow more,something
* really bad in this world..
*/
/*
* This is the main snoop per-device
* structure...
*/
struct snoop {
int snp_unit; /* Pty unit number to snoop on */
int snp_type; /* Type same as st_type later */
u_long snp_len,snp_base; /* Buffer data len and base */
u_long snp_blen; /* Overall buffer len */
char *snp_buf; /* Data buffer */
int snp_flags; /* Flags place */
#define SNOOP_NBIO 0x0001
#define SNOOP_ASYNC 0x0002
#define SNOOP_OPEN 0x0004
#define SNOOP_RWAIT 0x0008
#define SNOOP_OFLOW 0x0010
#define SNOOP_DOWN 0x0020
struct selinfo snp_sel; /* Selection info */
};
/*
* This is structure to be passed
* to ioctl() so we can define different
* types of tty's..
*/
struct snptty {
int st_unit;
int st_type;
#define ST_PTY 0 /* Regular Pty */
#define ST_VTY 1 /* Vty for SysCons.. */
#define ST_SIO 2 /* Serial lines */
#define ST_MAXTYPE 2
};
/*
* Theese are snoop io controls
* SNPSTTY accepts 'struct snptty' as input.
* If ever type or unit set to -1,snoop device
* detached from it's current tty.
*/
#define SNPSTTY _IOW('T', 90, struct snptty)
#define SNPGTTY _IOR('T', 89, struct snptty)
/*
* Theese values would be returned by FIONREAD ioctl
* instead of number of characters in buffer in case
* of specific errors.
*/
#define SNP_OFLOW -1
#define SNP_TTYCLOSE -2
#define SNP_DETACH -3
#endif
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