HP network peripheral pty daemon
/usr/lib/hpnptyd -m master_pty -x peripheral [-fk] [-p port] -t [ timeout ]
hpnptyd provides a network connection between a pseudo terminal
(pty) and an HP network peripheral. A daemon process is
invoked for each network connection. To an application, operating
on a pty has the appearance of operating on a local serial port.
hpnptyd opens the network connection when there is data from
the pty. It sends data from the pty to the peripheral over the network
connection and it passes data from the peripheral back to the pty.
hpnptyd closes the network connection
after a period when there is no more data from the pty or the
network peripheral, and all the pty data has been sent to the network
The length of the inactivity period can be specified using
Normally, /etc/rc starts hpnptyd at bootup.
When using hpnptyd, the print scheduler must be started after
starting the pty daemons.
hpnptyd accepts the following options:
Run in the foreground. Normally, hpnptyd runs in the background.
Keep the network connection open. This option can be used in conjunction with
the SIGHUP signal to control externally when the network connection
is closed down. After the network connection is closed, new data from the pty
will cause the connection to be re-opened.
Send verbose logging messages to file logfile. The logging messages
detail what hpnptyd is doing. Included in the messages are
how many bytes are read and written to the pty and to the network connection.
hpnptyd performs no logging if this option is omitted.
Specify master_pty as the master (controller) pty
for a network connection. For each master pty, there
will be a corresponding slave pty; application programs
interface to the slave pty. The naming conventions for
ptys is given in the ``Files'' section.
Specify port as the TCP/IP port number for a
network connection. The default port number is 9100.
-t [ timeout ]
Specify timeout as the timeout period for a network
connection. If there is no data from the pty or from the network peripheral
for timeout seconds and all the data read so far has been written to the network
peripheral, the network connection is closed. New data from the pty causes
the network connection to be re-opened. The default timeout is 30 seconds.
A timeout of 0 is not allowed.
Specify peripheral as the peripheral for printing.
This may be a host name or dotted decimal Internet address.
These signals have the specified effect when sent to hpnptyd
Causes hpnptyd to close the network connection after a timeout
interval when there has been no activity between the pty and network
Turns on logging. hpnptyd appends the log file if it was specified.
Otherwise, it writes to /usr/tmp/hpnptyd.<PID>.
Turns off logging.
To start up a single network connection from pty /dev/ptypa
to peripheral remhost:
/usr/lib/hpnp/hpnptyd -m /dev/ptypa -x remhost
To send the contents of file plot1 over the network connection in
the previous example:
cat plot1 > /dev/ttypa
The print job is not re-sent if the peripheral is power cycled while the job is
printing. Also, if the print job is small, the application may
complete sending before the print job is printed. The print job may
be buffered at the pty or at hpnptyd waiting to be sent to the
master pseudo terminals
slave pseudo terminals
default log file name
hpnptyd is not part of any currently supported standard; it was developed by Hewlett Packard and is used with permission.
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003