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gdc - operational user interface for gated(8)
/usr/sbin/gdc [-q] [-n] [-c coresize] [-f filesize] [-m datasize] [-s
stacksize] [-t seconds] command
-n Causes gdc to run without changing the kernel forwarding table. This
is useful for testing, and when operating as a route server that does
-q Causes gdc to run quietly. Informational messages that are normally
printed to the standard output are suppressed, and error messages are
logged by syslogd(8) instead of being printed to the standard error
output. This is often convenient when running gdc from a shell script.
Specifies the time in seconds for gdc to waiting for gated to complete
certain operations, in particular at termination and startup. The
default value is 10 seconds.
Specifies the maximum size of a core dump a gated started with gdc will
produce. This is useful on systems where the default maximum core dump
size is too small for gated to produce a full core dump on errors.
Sets the maximum file size a gated started with gdc will produce. This
is useful on systems where the default maximum file dump size is too
small for gated to produce a full state dump when requested.
Sets the maximum size of the data segment of a gated started with gdc.
This is useful on systems where the default data segment size is too
small for gated to run.
Sets the maximum size of stack of a gated started with gdc. This is
useful on systems where the default maximum stack size is too small for
gated to run.
The gdc command provides a user-oriented interface for the operation of the
gated routing daemon. It provides support for starting and stopping the
daemon, for the delivery of signals to manipulate the daemon when it is
operating, for the maintenance and syntax checking of configuration files,
and for the production and removal of state dumps and core dumps. The gdc
interface can reliably determine gated's running state and produces a
reliable exit status when errors occur, making it advantageous for use in
shell scripts which manipulate gated. Commands executed using gdc and,
optionally, error messages produced by the execution of those commands, are
logged using the same syslogd(8) facility that gated itself uses, providing
an audit trail of operations performed on the daemon.
If installed as a setuid root program, gdc allows non-root users who are
members of a trusted group (by default the gdmaint group) to manipulate the
routing daemon while denying access to others. The name of the user is
logged along using syslogd(8) along with an indication of each command
executed, for audit purposes.
You can use the following commands to send signals to gated:
Sends an abort signal to gated, causing it to terminate with a core
Signals gated to dump its current state into the /usr/tmp/gated_dump
Signals gated to recheck the interface configuration. The gated daemon
rechecks the interface configuration periodically, but you can force
the daemon to check interface status immediately when changes are known
to have occurred.
Causes gated to terminate. This is useful when the daemon is hung.
Signals gated to reread its configuration file, reconfiguring its
current state as appropriate.
Signals gated to terminate after shutting down all operating routing
protocols. If you issue this a second time, gated terminates even if
some protocols have not yet fully shut down.
Suspends tracing and closes the trace file, if gated is currently
tracing to a file. If gated tracing is currently suspended, this
reopens the trace file and initiates tracing. This is useful for
moving trace files.
By default, gated obtains its configuration information from the
/etc/gated.config file. The gdc program also maintains the following other
versions of the configuration file:
The new configuration file. When gdc is requested to install a new
configuration file, this file is renamed /etc/gated.conf.
The old configuration file. When gdc is requested to install a new
configuration file, the previous /etc/gated.conf is renamed to this
The next oldest configuration file. The gdc program retains the
previous old configuration file under this name.
Configuration File Commands
The following commands perform operations related to configuration files:
Checks /etc/gated.conf for syntax errors. This is done after changes to
the configuration file and before sending a reconfig signal to the
currently running gated, to ensure that there are no errors in the
configuration which would cause the running gated to terminate on
reconfiguration. When this command is used, gdc issues an
informational message indicating whether there were parse errors. If
any errors occurred, gdc saves the error output in a file for
Like checkconf, except that gdc checks the new configuration file,
Renames the /etc/gated.conf+ file as /etc/gated.conf, retaining the
older versions of the file as described previously. The gdc program
does nothing if the new configuration file does not exist or otherwise
Renames /etc/gated.conf- file as /etc/gated.conf, in effect going back
to the older version of the configuration file. The command does
nothing if /etc/gated.conf- does not exist or is zero length, or if the
operation would delete an existing, non-zero length /etc/gated.conf+
Performs a backout operation even if /etc/gated.conf+ exists and is of
Sets all configuration files to mode 664, owner root, group gdmaint.
This allows a trusted non-root user to modify the configuration files.
Creates a zero length configuration file with the file mode set to 664,
owner root, group gdmaint, if /etc/gated.conf+ does not exist. This
allows a trusted non-root user to install a new configuration file.
The following commands enable you to start and stop gated, and to determine
its running state:
Determines if gated is currently running by checking to see if gated
has a lock on the file containing its pid, if the pid in the file is
sensible and if there is a running process with that pid. If gated is
running, the command exits with a zero status. Otherwise, it exits
with a non-zero status.
Starts gated. The command returns an error if gated is already running.
Otherwise, it executes the gated binary and waits for up to the delay
interval (10 seconds by default, as set with the -t option otherwise)
until the newly started process obtains a lock on the pid file. A
non-zero exit status is returned if an error is detected while
executing the binary, or if a lock is not obtained on the pid file
within the specified wait time.
Stops gated, gracefully if possible, ungracefully if not. The command
returns an error (with non-zero exit status) if gated is not currently
running. Otherwise, it sends a terminate signal to gated and waits for
up to the delay interval (10 seconds by default, as specified with the
-t option otherwise) for the process to exit. If gated fails to exit
within the delay interval, a second terminate signal is sent. If it
fails to exit by the end of the second delay interval, a kill signal is
sent, forcing immediate termination. The command terminates with zero
exit status when it detects that gated has terminated, non-zero
If gated is running, it is terminated using the same procedure as the
stop command. When the previous gated terminates, or if it was not
running prior to command execution, a new gated process is executed
using the procedures previously described for the start command. A
non-zero exit status is returned if any step in this procedure fails.
The following commands allow the removal of files created by the execution
of some of the operational commands:
Removes any existing gated core dump file.
Removes any existing gated state dump file.
Removes the parse error file generated when a checkconf or checknew
command is executed and syntax errors are encountered in the
configuration file being checked.
The gated binary.
Contains the current gated configuration information.
Contains newer gated configuration information.
Contains older gated configuration information.
Contains the oldest gated configuration information.
Contains the gated process id (PID).
Contains gated status information.
Contains configuration file parse errors.
Specifies the path where gated creates its core file.
Commands: syslog(1), gated(8), ospf_monitor(8), ripquery(8), routed(8),
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