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_ */