FreeBSD Device Drivers

Kernel Event Handlers

Event handlers allow drivers to register one or more functions to be called when an event occurs. As an example, before halting the system, every function that is registered with the event handler shutdown_final is called. Table 5-1 describes every event handler that is available.

Table 5-1. Kernel Event Handlers

Event Handler	Description
acpi_sleep_event	Registered functions are called when the system is sent to sleep.
acpi_wakeup_event	Registered functions are called when the system is woken up.
dev_clone	Registered functions are called when a solicited item under /dev does not exist; in other words, these functions create device nodes on demand.
ifaddr_event	Registered functions are called when an address is set up on a network interface. ...