Ubuntu Manpage: SDL_GetJoystickPlayerIndex - Get the player index of an opened joystick.

       SDL_GetJoystickPlayerIndex - Get the player index of an opened joystick.

       Defined in SDL3/SDL_joystick.h

       #include "SDL3/SDL.h"

       int SDL_GetJoystickPlayerIndex(SDL_Joystick *joystick);

       For XInput controllers this returns the XInput user index. Many joysticks will not be able to supply this
       information.

       joystick
              the SDL_Joystick
               obtained from SDL_OpenJoystick ().

       Returns the player index, or -1 if it's not available.

       This function is available since SDL 3.2.0.