sd_event_source_unrefp() is similar to sd_event_source_unref() but takes a pointer to a pointer to an sd_event_source object. This call is useful in conjunction with GCC's and LLVM's m[blue]Clean-up Variable Attributem[][1]. Note that this function is defined as inline function.

sd_event_source_ref() may be used to increase by one the reference counter of the event source object specified as source.

sd_event_source_unref(), sd_bus_creds_unrefp() and sd_bus_creds_ref() execute no operation if the passed event source object is NULL.

Note that event source objects stay alive and may be dispatched as long as they have a reference counter greater than zero. In order to drop a reference of an event source and make sure the associated event source handler function is not called anymore it is recommended to combine a call of sd_event_source_unref() with a prior call to sd_event_source_set_enabled() with SD_EVENT_OFF.