Provided by: allegro5-doc_5.2.10.1+dfsg-1build1_all 

NAME
al_is_event_source_registered - Allegro 5 API
SYNOPSIS
#include <allegro5/allegro.h>
bool al_is_event_source_registered(ALLEGRO_EVENT_QUEUE *queue,
ALLEGRO_EVENT_SOURCE *source)
DESCRIPTION
Return true if the event source is registered.
SEE ALSO
al_register_event_source(3alleg5)
SINCE
5.2.0
Allegro reference manual al_is_event_source_registered(3alleg5)