#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>

int main (void)
{
	Display * display;
	int screen, count;
	Window root, window;
	Atom atoms [3];
	XSizeHints hints;
	XEvent event;
	
	/* Open the display and create a window */

	display = XOpenDisplay (0);
	if (! display)
	{
		printf ("XOpenDisplay error.\n");
		return 1;
	}
	
	screen = DefaultScreen (display);
	root = RootWindow (display, screen);

	window = XCreateSimpleWindow (display, root, 0, 0, 400, 300, 0, 0, 0);
	
	/* Tell it to maximize */

	atoms [0] = XInternAtom (display, "_NET_WM_STATE", 0);
	atoms [1] = XInternAtom (display, "_NET_WM_STATE_MAXIMIZED_HORZ", 0);
	atoms [2] = XInternAtom (display, "_NET_WM_STATE_MAXIMIZED_VERT", 0);
	XChangeProperty (display, window, atoms [0], XA_ATOM, 32, PropModeReplace,
	 (unsigned char *) (atoms + 1), 2);
	
	/* Map it */

	XMapWindow (display, window);

	/* Wait 5 seconds */
	
	for (count = 0; count < 5; count ++)
	{
		while (XPending (display))
			XNextEvent (display, & event);
		
		sleep (1);
	}
	
	/* Force it to 400x300 */

	hints.flags = PMinSize | PMaxSize;
	hints.min_width = 400;
	hints.min_height = 300;
	hints.max_width = 400;
	hints.max_height = 300;
	XSetWMNormalHints (display, window, & hints);

	/* Wait another 15 seconds */

	for (count = 0; count < 15; count ++)
	{
		while (XPending (display))
			XNextEvent (display, & event);
		
		sleep (1);
	}
	
	/* Shut everything down */

	XDestroyWindow (display, window);
	XCloseDisplay (display);
	
	return 0;
}