-h, --help
Print the monitor's options and the available reactors list.
-r, --reactor reactor
Enables the reactor. See -h for a list of available reactors.
-s, --self
When tracing (-t), also print the events that happened during the rv command itself. If the rv command itself generates too many events, the tool might get busy processing its own events only.
-t, --trace
Trace monitor's events and error.
-v, --verbose
Print debug messages.