pcf(4)pcf(4)NAMEpcf - port configuration file used by DDFA software
Description
A port configuration file is used by the Datacommunications and Termi‐
nal Controller Device File Access (DDFA) software to configure individ‐
ual terminal server ports. The generic name of the template file is In
practice, it is renamed for each port that needs different configura‐
tion values and the values are altered appropriately for the device
attached to the port. A port configuration file is referenced by an
entry in the Dedicated Ports file The Dedicated Port Parser parses the
file and spawns an Outbound Connection Daemon for each valid entry in
the file. A valid entry is one in which the fourth field is the name
of a port configuration file.
The master port configuration file is and it should only be referenced
in the file if the default values it contains are correct for the
ports. If different values are needed, should be copied to another
directory and the copy should be modified and referenced in the file.
The recommended procedure is to create a directory to hold the port
configuration files and the modified file.
See ddfa(7) for more information on how to configure the DDFA software.
A port configuration file consists of the names of variables and their
values. The variables are shown terminated by a colon but this is not
mandatory. A variable and its value can be separated by spaces or
tabs. Only one variable-value pair is allowed per line. Only the
value should be altered. The variable name should not be changed.
A file contains the following information:
This can have the value
or When it is enabled, data transfer over the net‐
work uses the Telnet protocol. This option be
enabled for a DTC.
This can have the value
or When it is enabled, a telnet timing mark negoti‐
ation is sent to the terminal server after all user
data has been transferred. waits for a reply to
the timing mark negotiation before closing the con‐
nection. This ensures that all data has been out‐
put from the terminal server to the device before
the buffers are flushed. It should be enabled for
a DTC.
This defines the time in seconds
during which the software waits for a response to
the telnet timing mark and binary negotiation. If
the timer expires, an error message is logged to
and the error is transmitted to the user applica‐
tion.
This can have the value
or When it is enabled, data transfer over the net‐
work is in binary mode and treatment of special
characters (such as XON/XOFF) is disabled.
Due to the absence of flow control, data integrity
cannot be guaranteed when is enabled.
Note that even if is disabled, it can be negotiated
at any time by the application setting to in the
data structure.
This defines the number of times the software
tries to open a connection before giving up. If
the value is the software tries ``forever''
(approximately 68 years). If the retry process
fails, an error message is logged to and the error
is transmitted to the user application.
The retry process can be interrupted by sending the
signal to the process using
Note that if the application exits after asking to
open the connection to the terminal server, contin‐
ues trying to open until the combination of the and
are exceeded.
This defines the time in seconds between open tries.
If the value is uses an exponential retry period
algorithm up to 32 seconds (i.e., 1 2 4 8 16 32 32
32 ...).
This defines the time in seconds
between the close call made by the application on
the pty slave and the moment when the connection is
actually closed. Setting this value to, for exam‐
ple, 5 seconds avoids the overhead of opening and
closing the connection when a spooler spools sev‐
eral files at a time. Setting a sufficiently high
value effectively leaves the connection permanently
open.
This can have the value
or When it is enabled, the software sends a status
request to the device attached to the terminal
server and processes the reply as follows:
continues processing.
retries within the limits of the status timer.
retries within the limits of the status timer.
retries within the limits of the status timer.
retries within the limits of the status timer.
This defines the time in seconds
during which the software waits for the reply to
the status request. If the timer expires, an error
message is logged to and the error is transmitted
to the user application.
This can have the value
or Normally, data bytes processed by the pty have
bit 7 stripped. If is enabled, the stripping is
disabled. If is disabled, stripping is enabled and
bit 7 is stripped. This can also be achieved by
changing the termio structure of the pseudonym
using ioctl() commands.
This can have the value
or When it is enabled, data is sent to the LAN as
it is received. It can be disabled if the software
is sending packets faster than the server can
accept them.
The default values are:
WARNINGS
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 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 and work cor‐
rectly, each pseudonym must be unique in its first 17 characters
(including the directory prefix If pseudonyms are not unique in their
first 17 characters, the correct functioning of many commands is not
guaranteed.
FILESSEE ALSOdpp(1M), ocd(1M), ocdebug(1M), dp(4), ddfa(7).
pcf(4)
