#include <X11/Xlib.h>

int main(int argc, char **argv) {
    Display *display;
    XEvent xevent;
    Window window;

    if ((display = XOpenDisplay(NULL)) == NULL)
        return -1;

    window = DefaultRootWindow(display);
    XSelectInput(display, window, PointerMotionMask);


    while (1) {
        XNextEvent(display, &xevent);

        switch (xevent.type) {
            case MotionNotify:
                if (xevent.xmotion.y_root < 1) {
                    XWarpPointer(display, None, window, 0, 0, 0, 0, xevent.xmotion.x_root, 1);
                    XFlush(display);
                }
                break;
        }
    }

    return 0;
}