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XGrabServer, XUngrabServer - grab the server
int XGrabServer(Display *display); int XUngrabServer(Display *display);
display Specifies the connection to the X server.
The XGrabServer function disables processing of requests and close downs on all other connections than the one this request arrived on. You should not grab the X server any more than is absolutely necessary. The XUngrabServer function restarts processing of requests and close downs on other connections. You should avoid grabbing the X server as much as possible.
XGrabButton(3), XGrabKey(3), XGrabKeyboard(3), XGrabPointer(3) Xlib - C Language X Interface