#include <stdlib.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/extensions/Xfixes.h>

/* usage: xbarrier x1 y1 x2 y2 */
int main(int argc, char **argv)
{
    Display *dpy;
    PointerBarrier b;
    int x1, y1, x2, y2;

    if (argc != 5)
	return 1;

    dpy = XOpenDisplay(NULL);
    if (!dpy)
	return 1;

    x1 = atoi(argv[1]);
    y1 = atoi(argv[2]);
    x2 = atoi(argv[3]);
    y2 = atoi(argv[4]);

    b = XFixesCreatePointerBarrier(dpy, DefaultRootWindow(dpy), x1, y1, x2, y2,
				   0, 0, NULL);

    XSync(dpy, 1);

    if (!b)
	return 1;

    pause();

    XFixesDestroyPointerBarrier(dpy, b);

    XCloseDisplay(dpy);
    return 0;
}