al_get_joystick - Allegro 5 API

       Get  a handle for a joystick on the system.  The number may be from 0 to al_get_num_joysticks(3alleg5)-1.
       If successful a pointer to a joystick object is returned, which represents a physical device.   Otherwise
       NULL is returned.

       The  handle  and  the  index  are  only  incidentally linked.  After al_reconfigure_joysticks(3alleg5) is
       called, al_get_joystick(3alleg5) may return handles in a different order,  and  handles  which  represent
       disconnected devices will not be returned.

       al_get_joystick - Allegro 5 API

al_get_num_joysticks(3alleg5), al_reconfigure_joysticks(3alleg5), al_get_joystick_active(3alleg5)

Allegro reference manual                                                                al_get_joystick(3alleg5)

              #include <allegro5/allegro.h>

              ALLEGRO_JOYSTICK * al_get_joystick(int num)