Installing under UNIX/LINUX
AX3000 Models 80 and 85 - User's Manual 167
b) Running the Axel Tty Server
The command to start the AXEL tty server is:
/etc/axttyd [-f file] [-l log] [-n port] [-hbFUk] &
-b: use a buffer for received data.
-f: configuration file (default: /etc/axfile).
-F: ttyp buffers are flushed when the tty connection is established.
-h: on-line help.
-l: log file (default: /tmp/axttylog).
-n: TCP port (default: 2048) for connections using the tty service.
-U: only unidirectional dataflow is supported. Data from the network is dropped.
-k: turn-off keepalive function.
Note: take care to add the '&' character at the end of line.
The AXEL tty server can be started either from the UNIX command line or at boot time (from
S91axel or S91axtty).
All authorized associations, connections and disconnections will be recorded in the specified log
file.
8.4.4 - The axttyd Mechanism
The axttyd daemon performs the following steps:
- init stage: association file checking (errors are reported in the log file) and associated ptty
opening (masters and slaves),
- rtty stage: for each rtty association, a child process is created. Each child process listens on
the associated ptty. When data is received a socket is opened on the AX3000 auxiliary port.
Bi-directional communication is then enabled. If no data is sent or received for any one
minute interval, the connection is closed. It will be opened again, the next time data is
received from the ptty.
- tty stage: when all the rtty child processes are created, the axttyd daemon listens on the
TCP/IP socket (generally 2048). For each connection request (from an AX3000 tty service),
a child process is created. This process controls communication between the ptty and the
AX3000 resource (session or auxiliary port).
8.4.5 - Uninstalling
Remove the AXEL files and kill the AXEL tty server process (signal TERM):
# kill -TERM pid<CR>
where pid is the process ID of the AXEL tty server.
8.4.6 - In Event of Problems...
In event of difficulties please consult the logfile (/tmp/axttylog) and to read the last messages.
a) Message "Can not bind TCP port"
The message indicates the axtty TCP port (2048 by default) is currently in use. This port must be
released.
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