NAME

xty − TELNET/rlogin terminal interface

DESCRIPTION

The xty device works like a normal tty device, except that it communicates with the EXOS 8000 on-board TELNET/rlogin server instead of with an actual terminal multiplexer. 

Minor device numbers 0-7 are used like any other tty device by the system’s login listener [see getty(1M)].  The xty device emulates the behavior of a tty device that implements modem controls.  An open request to the xty device blocks until some rlogin(1C) or telnet(1C) client connects to the on-board TELNET/rlogin server.  This is equivalent to a modem asserting carrier detect.  If the TELNET/rlogin client severs the connection before logging out, the xty device sends the SIGHUP signal to the user’s process group.  This is equivalent to a modem losing carrier.  When the xty device is closed, it severs the TELNET/rlogin connection. 

Minor device number 8 is reserved for the uucp server program [see ud(1M)]. 

The xty driver is initially configured in the host system’s normal (“cooked”) tty startup mode.  It responds as follows to TELNET option state changes:

DO ECHOechoing is enabled
DONT ECHOechoing is disabled
DO BINARYraw mode is enabled
DONT BINARYraw mode is disabled

All other TELNET options have no effect.

TELNET Network Virtual Terminal (NVT) functions have the following effects:

IPsend SIGINT signal to user’s process group
AYTon-board server returns an ASCII BEL
ECsame as typing current erase character
ELsame as typing current kill character
AOno effect

FILES

/dev/ttyT[0-7]TELNET/rlogin server devices
/dev/ttyT8uucp server device

SEE ALSO

netload(1M), rlogin(1C), telnet(1C), ud(1M)

Version 2.4  —  May 08, 1986