al_get_mouse_event_source - Allegro 5 API

       Retrieve  the  mouse  event source.  All [mouse events]ALLEGRO_EVENT_MOUSE_AXES(3alleg5) are generated by
       this event source.

       Returns NULL if the mouse subsystem was not installed.

Allegro reference manual                                                      al_get_mouse_event_source(3alleg5)

       al_get_mouse_event_source - Allegro 5 API

              #include <allegro5/allegro.h>

              ALLEGRO_EVENT_SOURCE *al_get_mouse_event_source(void)