Determine if a joystick has been opened
#include "SDL.h"
int SDL_JoystickOpened(int index);
Determines whether a joystick has already been opened within the application. index refers to the N'th joystick on the system.
Returns 1 if the joystick has been opened, or 0 if it has not.
SDL_JoystickOpen, SDL_JoystickClose