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Manual page for hpnptyd(8C)

hpnptyd - HP network peripheral pty daemon


hpnptyd -m master_pty -x peripheral [-fk] [-p port] [-t timeout] [-l logfile]


Hpnptyd provides a network connection between a pseudo terminal (pty) and an HP network peripheral. A daemon process is invoked for each network connection. For applications that operate on serial ports, 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. Data from the pty is sent to the peripheral over the network connection. Data from the peripheral is passed back to the pty. After a period when there is no more data from the pty, no more data from the network peripheral, and all the pty data has been sent to the network peripheral, the network connection is closed. The length of the inactivity period can be specified by the timeout command line value.

Note: The printjob is not re-sent if the peripheral is power cycled while the job is printing. Also, if the printjob is small, the sending application may complete sending and the printjob has not been printed yet. The printjob may be buffered at the pty or at hpnptyd waiting to be sent to the peripheral.

Normally hpnptyd is started at bootup from /etc/rc. When using hpnptyd, the print scheduler must be started after starting the pty daemons.

Options are:

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 externally control 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.
-l logfile
Send verbose logging messages to file logfile. The logging messages are detailed messages about what hpnptyd is doing. Included in the messages are how many bytes are read and written to the pty and to the network connection. If this option is omitted, no logging is performed.
-m master_pty
Specify master_pty as the master (or 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 pty's will vary from operating system to operating system; consult your system documentation.
-p port
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.
-x peripheral
Specify peripheral as the peripheral for printing. This may be a host name or dotted decimal Internet address.

The following signals have the specified effect when sent to hpnptyd using the kill.1 command:

Causes hpnptyd to close the network connection after a timeout interval of no activity between the pty and network peripheral.
Turns on logging. If a log file was specified, it is appended to. If no log file was specified, logging messages are written to /var/tmp/hpnptyd.<PID>.
Turns off logging.


To start up a single network connection from pty /dev/ptypa to peripheral foobar: /usr/lib/hpnp/hpnptyd -m /dev/ptypa -x foobar To send the contents of file plot1 over the network connection in the previous example: cat plot1 >/dev/ttypa


master pseudo terminals
slave pseudo terminals
default log file name


pty(4), hpnpf(8C)

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Created by unroff & hp-tools. © by Hans-Peter Bischof. All Rights Reserved (1997).

Last modified 21/April/97