+#include <stdio.h>
+#include <unistd.h>
+#include <X11/Xlib.h>
+
+int main () {
+ Display *display;
+ Window win;
+ XEvent report;
+ Atom _net_fs, _net_state;
+ XEvent msg;
+ int x=10,y=10,h=100,w=400;
+
+ display = XOpenDisplay(NULL);
+
+ if (display == NULL) {
+ fprintf(stderr, "couldn't connect to X server :0\n");
+ return 0;
+ }
+
+ _net_state = XInternAtom(display, "_NET_WM_STATE", False);
+ _net_fs = XInternAtom(display, "_NET_WM_STATE_FULLSCREEN", False);
+
+ win = XCreateWindow(display, RootWindow(display, 0),
+ x, y, w, h, 10, CopyFromParent, CopyFromParent,
+ CopyFromParent, 0, NULL);
+
+ XSetWindowBackground(display,win,WhitePixel(display,0));
+
+ XMapWindow(display, win);
+ XFlush(display);
+ sleep(2);
+
+ msg.xclient.type = ClientMessage;
+ msg.xclient.message_type = _net_state;
+ msg.xclient.display = display;
+ msg.xclient.window = win;
+ msg.xclient.format = 32;
+ msg.xclient.data.l[0] = 2; // toggle
+ msg.xclient.data.l[1] = _net_fs;
+ msg.xclient.data.l[2] = 0l;
+ msg.xclient.data.l[3] = 0l;
+ msg.xclient.data.l[4] = 0l;
+ XSendEvent(display, RootWindow(display, 0), False,
+ StructureNotifyMask | SubstructureNotifyMask, &msg);
+ XFlush(display);
+ sleep(2);
+
+ msg.xclient.type = ClientMessage;
+ msg.xclient.message_type = _net_state;
+ msg.xclient.display = display;
+ msg.xclient.window = win;
+ msg.xclient.format = 32;
+ msg.xclient.data.l[0] = 2; // toggle
+ msg.xclient.data.l[1] = _net_fs;
+ msg.xclient.data.l[2] = 0l;
+ msg.xclient.data.l[3] = 0l;
+ msg.xclient.data.l[4] = 0l;
+ XSendEvent(display, RootWindow(display, 0), False,
+ StructureNotifyMask | SubstructureNotifyMask, &msg);
+
+ XSelectInput(display, win, ExposureMask | StructureNotifyMask);
+
+ while (1) {
+ XNextEvent(display, &report);
+
+ switch (report.type) {
+ case Expose:
+ printf("exposed\n");
+ break;
+ case ConfigureNotify:
+ x = report.xconfigure.x;
+ y = report.xconfigure.y;
+ w = report.xconfigure.width;
+ h = report.xconfigure.height;
+ printf("confignotify %i,%i-%ix%i\n",x,y,w,h);
+ break;
+ }
+
+ }
+
+ return 1;
+}