al_is_haptic_active man page
al_is_haptic_active — Allegro 5 API
#include <allegro5/allegro.h> bool al_is_haptic_active(ALLEGRO_HAPTIC *hap)
Returns true if the haptic device can currently be used, false if not.
[Unstable API]: Perhaps could be simplified due to limited support for all the exposed features across all of the platforms. Awaiting feedback from users.