SDL_WaitEvent (3) Linux Manual Page
SDL_WaitEvent – Waits indefinitely for the next available event.
Synopsis
#include "SDL.h" int SDL_WaitEvent(SDL_Event *event);
Description
Waits indefinitely for the next available event, returning 1, or 0 if there was an error while waiting for events. If event is not NULL, the next event is removed from the queue and stored in that area.