SDL_SetWindowModal - Man Page

#include <SDL3/SDL_video.h>

bool SDL_SetWindowModal(SDL_Window *window, bool modal);

To enable modal status on a window, the window must currently be the child window of a parent, or toggling modal status on will fail.

window

the window on which to set the modal state.

modal

true to toggle modal status on, false to toggle it off.

for more information.

This function should only be called on the main thread.

This function is available since SDL 3.2.0.

SDL_SetWindowParent(3), SDL_WINDOW_MODAL(3)

SDL_SetWindowParent(3).