al_is_haptic_effect_playing - Allegro 5 API

       Returns  true if the haptic effect is currently playing.  Returns false if the effect has been stopped or
       if it has already finished playing, or if it has not been played  yet.   The  play_id  must  be  a  valid
       ALLEGRO_HAPTIC_EFFECT_ID(3alleg5)         obtained         from         al_upload_haptic_effect(3alleg5),
       al_upload_and_play_haptic_effect(3alleg5) or al_rumble_haptic(3alleg5).

       al_is_haptic_effect_playing - Allegro 5 API

       5.1.8

              [UnstableAPI]: Perhaps could be simplified due to limited support for all  the  exposed  features
              across all of the platforms.  Awaiting feedback from users.

Allegro reference manual                                                    al_is_haptic_effect_playing(3alleg5)

              #include <allegro5/allegro.h>

              bool al_is_haptic_effect_playing(ALLEGRO_HAPTIC_EFFECT_ID *id)