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-.Dd Februar 17, 1995
-.Dt SNP(4)
-.Os
-.Sh NAME
-
- snp  - tty snoop interface.
-
-.Sh SYNOPSIS
-#include <sys/snoop.h>
-
-.Sh DESCRIPTION
- /dev/snp? are snoop devices which allow user to attach to any tty
-and watch activities on it. Device can be used by root only.
- To connect device to tty use special iocontrol SNPSTTY.Argument to
-it is a structure 'snptty'. 
-              struct snptty {
-                     int st_type;
-                     int st_unit;
-              }
-
-st_type - type of tty to attach. Currently supported are :
-       ST_PTY - pseudo-tty devices.
-       ST_VTY - virtual ttys (syscons).
-       ST_SIO - serial ttys.
-
-st_unit - number of tty unit.
-By specifying ever st_type or st_unit -1 user can detach snp 
-device from tty.
-
- SNPGTTY  - iocontrol returns current tty attached.
- FIONREAD - iocontrol returns ever positive value equal to number of
-            characters in read buffer. Also special values defined:
-             SNP_OFLOW    - device overflow occured,device automatically
-                            detached.
-             SNP_TTYCLOSE - tty still has not been attached.       
-             SNP_DETACH   - snp device has been detached by user or
-                            tty device has been closed and detached
-                            automatically.
-  
-.Sh SEE ALSO
-
-watch(8), pty(4), sio(4)
-.Sh BUGS
-
-While in line mode,user input can't be seen.
-Has no ability to write to attached tty device.
-
-.Sh HISTORY
-FreeBSD 2.1 by Ugen J.S.Antsilevich <ugen@NetVision.net.il>