man poll_joystick () - Polls the joystick. Allegro game programming library.
NAME
poll_joystick - Polls the joystick. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
int poll_joystick();
DESCRIPTION
The joystick 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);
RETURN VALUE
Returns zero on success or a negative number on failure (usually because no joystick driver was installed).