DelayedShutdownHook is called immediately when radiusd is signalled to restart or terminate, and DelayedShutdownTime has been set. This hook can, for example, signal upstream proxies about the impending shutdown.

For more information, see Section 3.7.35. DelayedShutdownTime. DelayedShutdownHook is passed the following argument:

# Tell NASes to stop sending traffic to us
DelayedShutdownHook file:"%D/delayed-shutdown-hook.pl"