Provided by: libsdl3-doc_3.2.20+ds-2_all 

NAME
SDL_GetGamepadJoystick - Get the underlying joystick from a gamepad.
SYNOPSIS
#include <SDL3/SDL_gamepad.h>
SDL_Joystick * SDL_GetGamepadJoystick(SDL_Gamepad *gamepad);
DESCRIPTION
This function will give you a SDL_Joystick object, which allows you to use the SDL_Joystick functions
with a SDL_Gamepad object. This would be useful for getting a joystick's position at any given time, even
if it hasn't moved (moving it would produce an event, which would have the axis' value).
The pointer returned is owned by the SDL_Gamepad. You should not call SDL_CloseJoystick() on it, for
example, since doing so will likely cause SDL to crash.
FUNCTION PARAMETERS
gamepad
the gamepad object that you want to get a joystick from.
RETURN VALUE
Returns an SDL_Joystick object, or NULL on failure; call SDL_GetError() for more information.
AVAILABILITY
This function is available since SDL 3.2.0.
Simple Directmedia Layer SDL 3.2.20 SDL_GetGamepadJoystick(3)