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HP-UX 11i Version 3: February 2007

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ocd — outbound connection daemon used by DDFA software


ocd -fpseudonym -nnode_name [-b board_no] [-c config_file] [-l log_level] [-p port_no]


The Outbound Connection Daemon (ocd) is part of the Data Communications and Terminal Controller (DTC) Device File Access (DDFA) software. It manages the connection and data transfer to the remote terminal server port. It can be spawned from the Dedicated Port Parser (dpp) or run directly from the shell.

For performance reasons, ocd does not have a debug mode. However, a version called ocdebug with debug facilities is available.

See ddfa(7) for more information on how to configure the DDFA software and for an explanation of how it works.

ocd logs important messages and error conditions to /var/adm/syslog.


ocd recognizes the following options:


The board number of a DTC. If it is omitted, the port number option must contain the full TCP service port address. The -b and -p options must not be used if the IP address given in the -n option is the IP address of a port.

If the -n option explicitly names a terminal server port, the -b option is not needed.


Specify the name (including the absolute path) of the configuration file used to profile the terminal server port. If this option is omitted, the default values specified in the default pcf file (/usr/examples/ddfa/pcf) are used. If the file specified does not exist, an error message is logged and the following values are used (note that the values for open_tries and open_timer are different from the default values):

telnet_mode: enable timing_mark: enable telnet_timer: 120 binary_mode: disable open_tries: 0 open_timer: 0 close_timer: 0 status_request: disable status_timer: 30 eight_bit: disable tcp_nodelay: enable


The absolute or relative path to the device file that is linked by the software to the reserved pty. Applications use pseudonym and not the dynamically allocated pty slave.


Specify the logging level. It determines the severity of messages sent to /var/adm/syslog. The logging levels (and how they relate to system logging levels) are as follows:


Log only LOG_CRIT messages.


Log only LOG_CRIT and LOG_ERR messages.


Log only LOG_CRIT, LOG_ERR, and LOG_WARNING messages.


Log all messages.

If this option is omitted, the logging level is set to 1.


The IP address of the terminal server or the port.


A DTC port number or, if the -b option is omitted, the TCP port service address that will be used by the software to access the port. If the value is omitted, the value 23 (Telnet) is used by default.

In order to shutdown every ocd running without restarting them, the following command can be executed:

kill -15 `ps -e | grep ocd | awk '{print $1}'`


In order to ensure that commands (such as ps) display the correct device file name (that is, the pseudonym), all pseudonyms should be placed into the directory /dev/telnet. If pseudonyms are not specified for placement in this directory, the correct display of device file names with many commands is not guaranteed.

In addition, in order to ensure that commands (such as w, passwd, finger, and wall) work correctly, each pseudonym must be unique in its first 17 characters (including the directory prefix /dev/telnet/). If pseudonyms are not unique in their first 17 characters, the correct functioning of many commands is not guaranteed.

Also, in order to reliably handle timing mark negotiations (and ensure that files printing on a printer attached to a terminal server have been completely flushed to that printer), the following line must be added near the end of each printer interface script for printers attached to a terminal server:

stty exta <&1 2>/dev/null

The printer interface scripts reside in the directory /etc/lp/interface. The line must be added just prior to the final exit command in each printer interface script.

If this line is not added as specified, the printing reliability of printers attached to a terminal server is not guaranteed.


/usr/examples/ddfa/dp /usr/examples/ddfa/pcf /usr/sbin/dpp /usr/sbin/ocd /usr/sbin/ocdebug /var/adm/dpp_login.bin /var/adm/utmp.dfa

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