SDL_JoystickOpened (3) - Linux Manuals
SDL_JoystickOpened: Determine if a joystick has been opened
NAME
SDL_JoystickOpened - Determine if a joystick has been openedSYNOPSIS
#include "SDL.h"
int SDL_JoystickOpened(int index);
DESCRIPTION
Determines whether a joystick has already been opened within the application. index refers to the N'th joystick on the system.
RETURN VALUE
Returns 1 if the joystick has been opened, or 0 if it has not.
SEE ALSO
SDL_JoystickOpen, SDL_JoystickClose