diff -r 1456ca0c94b7 dwm.c
--- a/dwm.c	Sun Apr 11 18:42:32 2010 +0100
+++ b/dwm.c	Mon May 24 21:12:07 2010 +0200
@@ -58,7 +58,8 @@
 /* enums */
 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
-enum { NetSupported, NetWMName, NetLast };              /* EWMH atoms */
+enum { NetSupported, NetWMName, NetWMState,
+       NetWMFullscreen, NetLast };                      /* EWMH atoms */
 enum { WMProtocols, WMDelete, WMState, WMLast };        /* default atoms */
 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
@@ -162,6 +163,7 @@
 static void cleanup(void);
 static void cleanupmon(Monitor *mon);
 static void clearurgent(Client *c);
+static void clientmessage(XEvent *e);
 static void configure(Client *c);
 static void configurenotify(XEvent *e);
 static void configurerequest(XEvent *e);
@@ -250,6 +252,7 @@
 static unsigned int numlockmask = 0;
 static void (*handler[LASTEvent]) (XEvent *) = {
 	[ButtonPress] = buttonpress,
+	[ClientMessage] = clientmessage,
 	[ConfigureRequest] = configurerequest,
 	[ConfigureNotify] = configurenotify,
 	[DestroyNotify] = destroynotify,
@@ -1293,6 +1296,20 @@
 }
 
 void
+clientmessage(XEvent *e) {
+	XClientMessageEvent *cme = &e->xclient;
+
+	if (cme->message_type == netatom[NetWMState]) {
+		if (cme->data.l[1] == netatom[NetWMFullscreen]) {
+			if (cme->data.l[0])
+				XChangeProperty(dpy, cme->window, netatom[NetWMState], XA_ATOM, 32, PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
+			else
+				XChangeProperty(dpy, cme->window, netatom[NetWMState], XA_ATOM, 32, PropModeReplace, (unsigned char*)0, 0);
+		}
+	}
+}
+
+void
 quit(const Arg *arg) {
 	running = False;
 }
@@ -1392,6 +1409,7 @@
 	XEvent ev;
 	static const char *evname[LASTEvent] = {
 		[ButtonPress] = "buttonpress",
+		[ClientMessage] = "clientmessage",
 		[ConfigureRequest] = "configurerequest",
 		[ConfigureNotify] = "configurenotify",
 		[DestroyNotify] = "destroynotify",
@@ -1510,6 +1528,8 @@
 	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
+	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
+	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
 	/* init cursors */
 	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);