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  * $FreeBSD$
  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
  43 struct 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 #endif /* _KERNEL */
  60
  61 /*
  62  * Theese are snoop io controls
  63  * SNPSTTY accepts 'struct snptty' as input.
  64  * If ever type or  unit set to -1,snoop device
  65  * detached from its current tty.
  66  */
  67
  68 #define SNPSTTY       _IOW('T', 90, dev_t)
  69 #define SNPGTTY       _IOR('T', 89, dev_t)
  70
  71 /*
  72  * Theese values would be returned by FIONREAD ioctl
  73  * instead of number of characters in buffer in case
  74  * of specific errors.
  75  */
  76 #define SNP_OFLOW               -1
  77 #define SNP_TTYCLOSE            -2
  78 #define SNP_DETACH              -3
  79
  80 #endif /* !_SYS_SNOOP_H_ */