This function is used to enable or disable joystick event processing. With joystick event processing disabled you will have to update joystick states with SDL_JoystickUpdate and read the joystick information manually. state is either SDL_QUERY, SDL_ENABLE or SDL_IGNORE.
Joystick event handling is prefered
SDL Joystick Functions, SDL_JoystickUpdate, SDL_JoyAxisEvent, SDL_JoyBallEvent, SDL_JoyButtonEvent, SDL_JoyHatEvent