[−][src]Function esp_idf_bindgen::esp_event_handler_register

pub unsafe extern "C" fn esp_event_handler_register(
    event_base: esp_event_base_t, 
    event_id: i32, 
    event_handler: esp_event_handler_t, 
    event_handler_arg: *mut c_void
) -> esp_err_t

@brief Register an event handler to the system event loop (legacy).

@note This function is obsolete and will be deprecated soon, please use esp_event_handler_instance_register() instead.

This function can be used to register a handler for either: (1) specific events, (2) all events of a certain event base, or (3) all events known by the system event loop.

Registering multiple handlers to events is possible. Registering a single handler to multiple events is also possible. However, registering the same handler to the same event multiple times would cause the previous registrations to be overwritten.

@param[in] event_base the base id of the event to register the handler for @param[in] event_id the id of the event to register the handler for @param[in] event_handler the handler function which gets called when the event is dispatched @param[in] event_handler_arg data, aside from event data, that is passed to the handler when it is called

@note the event loop library does not maintain a copy of event_handler_arg, therefore the user should ensure that event_handler_arg still points to a valid location by the time the handler gets called

@return