SDL_JoystickOpened - 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