SDL_WM_GrabInput (3) - Linux Manuals
SDL_WM_GrabInput: Grabs mouse and keyboard input.
NAME
SDL_WM_GrabInput - Grabs mouse and keyboard input.SYNOPSIS
#include "SDL.h"
SDL_GrabMode SDL_WM_GrabInput(SDL_GrabMode mode);
DESCRIPTION
Grabbing means that the mouse is confined to the application window, and nearly all keyboard input is passed directly to the application, and not interpreted by a window manager, if any.
When mode is SDL_GRAB_QUERY the grab mode is not changed, but the current grab mode is returned.
typedef enum {
SDL_GRAB_QUERY,
SDL_GRAB_OFF,
SDL_GRAB_ON
} SDL_GrabMode;