NAME¶
rfxclock - ION daemon task for managing scheduled events
SYNOPSIS¶
rfxclock
DESCRIPTION¶
rfxclock is a background "daemon" task that periodically
applies scheduled changes in node connectivity and range to the ION node's
database. It is spawned automatically by
ionadmin in response to the
's' command that starts operation of the ION node infrastructure, and it is
terminated by
ionadmin in response to an 'x' (STOP) command.
Once per second,
rfxclock takes the following action:
For each neighboring node that has been refusing custody
of bundles sent to it to be forwarded to some destination node, to which no
such bundle has been sent for at least N seconds (where N is twice the one-way
light time from the local node to this neighbor),
rfxclock turns on a
probeIsDue flag authorizing transmission of the next such bundle in
hopes of learning that this neighbor is now able to accept custody.
Then
rfxclock purges the database of all range and contact information
that is no longer applicable, based on the stop times of the records.
Finally,
rfxclock applies to the database all range and contact
information that is currently applicable, i.e., those records whose start
times are before the current time and whose stop times are in the
future.
EXIT STATUS¶
- "0"
- rfxclock terminated, for reasons noted in the ion.log file.
If this termination was not commanded, investigate and solve the problem
identified in the log file and use ionadmin to restart
rfxclock.
- "1"
- rfxclock was unable to attach to the local ION node, probably
because ionadmin has not yet been run.
FILES¶
No configuration files are needed.
ENVIRONMENT¶
No environment variables apply.
DIAGNOSTICS¶
The following diagnostics may be issued to the
ion.log log file:
- rfxclock can't attach to ION.
- ionadmin has not yet initialized the ION database.
- Can't apply ranges.
- An unrecoverable database error was encountered. rfxclock
terminates.
- Can't apply contacts.
- An unrecoverable database error was encountered. rfxclock
terminates.
- Can't purge ranges.
- An unrecoverable database error was encountered. rfxclock
terminates.
- Can't purge contacts.
- An unrecoverable database error was encountered. rfxclock
terminates.
BUGS¶
Report bugs to <ion-bugs@korgano.eecs.ohiou.edu>
SEE ALSO¶
ionadmin(1)