poll_joystick - Polls the joystick. Allegro game programming library.

       The  joystick  handler  is not interrupt driven, so you need to call this function every now and again to
       update the global position values. Example:

          do {
             /* Get joystick input */
             poll_joystick();

             /* Process input for the first joystick */
             if (joy[0].button[0].b)
                first_button_pressed();

             if (joy[0].button[1].b)
                second_button_pressed();
             ...
          } while(!done);

       poll_joystick - Polls the joystick. Allegro game programming library.

       Returns zero on success or a  negative  number  on  failure  (usually  because  no  joystick  driver  was
       installed).

install_joystick(3alleg4), joy(3alleg4), num_joysticks(3alleg4), exjoy(3alleg4)

Allegro                                           version 4.4.3                           poll_joystick(3alleg4)

#include<allegro.h>intpoll_joystick();