grab on the root window, it is correct, all lockers do that

.hgtags

@@ -1,2 +1,5 @@
 0a95c73c7374fbc2342b6040d9f35ddf597729e1 0.1
 da5cb1f0a685258d5315ea109860bacbc2871a57 0.2
+f9157b1864388ad8f1920e5fde7c5849e73d8327 0.3
+4c2cf4d6a2d0e08cbe280ec50ef76c9aecfc0fbe 0.4
+bd24ea7fcca26b161225c464df23ecbfe85280e1 0.5

LICENSE

@@ -1,6 +1,6 @@
 MIT/X Consortium License
 
-(C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
+(C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
 
 Permission is hereby granted, free of charge, to any person obtaining a
 copy of this software and associated documentation files (the "Software"),

Makefile

@@ -1,5 +1,5 @@
 # slock - simple screen locker
-#   (C)opyright MMVI Anselm R. Garbe
+#   (C)opyright MMVI-MMVII Anselm R. Garbe
 
 include config.mk
 

config.mk

@@ -1,5 +1,5 @@
 # slock version
-VERSION = 0.3
+VERSION = 0.6
 
 # Customize below to fit your system
 
@@ -21,7 +21,7 @@ LDFLAGS = ${LIBS}
 #LDFLAGS = -g ${LIBS}
 
 # On *BSD remove -DHAVE_SHADOW_H from CFLAGS
-# On OpenBSD remove -lcrypt from LIBS
+# On OpenBSD and Darwin remove -lcrypt from LIBS
 
 # compiler and linker
 CC = cc

slock.c

@@ -1,4 +1,4 @@
-/* (C)opyright MMIV-MMV Anselm R. Garbe <garbeam at gmail dot com>
+/* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
  * See LICENSE file for license details.
  */
 #define _XOPEN_SOURCE 500
@@ -58,7 +58,7 @@ main(int argc, char **argv) {
 	Display *dpy;
 	KeySym ksym;
 	Pixmap pmap;
-	Window w;
+	Window root, w;
 	XColor black, dummy;
 	XEvent ev;
 	XSetWindowAttributes wa;
@@ -73,36 +73,42 @@ main(int argc, char **argv) {
 		exit(EXIT_FAILURE);
 	}
 	screen = DefaultScreen(dpy);
+	root = RootWindow(dpy, screen);
 
 	/* init */
 	wa.override_redirect = 1;
 	wa.background_pixel = BlackPixel(dpy, screen);
-	w = XCreateWindow(dpy, RootWindow(dpy, screen), 0, 0,
+	w = XCreateWindow(dpy, root, 0, 0, DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
-			DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
 			0, DefaultDepth(dpy, screen), CopyFromParent,
 			DefaultVisual(dpy, screen), CWOverrideRedirect | CWBackPixel, &wa);
-
 	XAllocNamedColor(dpy, DefaultColormap(dpy, screen), "black", &black, &dummy);
 	pmap = XCreateBitmapFromData(dpy, w, curs, 8, 8);
 	invisible = XCreatePixmapCursor(dpy, pmap, pmap, &black, &black, 0, 0);
 	XDefineCursor(dpy, w, invisible);
-	running = XGrabPointer(dpy, RootWindow(dpy, screen), False,
-			ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
-			GrabModeAsync, GrabModeSync, None, invisible, CurrentTime) == GrabSuccess;
-	len = 10;
-	for(len = 10; len && (XGrabKeyboard(dpy, RootWindow(dpy, screen), True, GrabModeAsync,
-		GrabModeAsync, CurrentTime) != GrabSuccess); len--)
-		usleep(1000);
-	running = running && (len > 0);
-	len = 0;
 	XMapRaised(dpy, w);
+	for(len = 1000; len; len--) {
+		if(XGrabPointer(dpy, root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
+			GrabModeAsync, GrabModeSync, None, invisible, CurrentTime) == GrabSuccess)
+			break;
+		usleep(1000);
+	}
+	if((running = running && (len > 0))) {
+		for(len = 1000; len; len--) {
+			if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
+				== GrabSuccess)
+				break;
+			usleep(1000);
+		}
+		running = (len > 0);
+	}
+	len = 0;
 	XSync(dpy, False);
 
 	/* main event loop */
 	while(running && !XNextEvent(dpy, &ev))
 		if(ev.type == KeyPress) {
 			buf[0] = 0;
-			num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
+			num = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, 0);
 			if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
 					|| IsMiscFunctionKey(ksym) || IsPFKey(ksym)
 					|| IsPrivateKeypadKey(ksym))
@@ -122,7 +128,7 @@ main(int argc, char **argv) {
 					--len;
 				break;
 			default:
-				if(num && !iscntrl((int) buf[0])) {
+				if(num && !iscntrl((int) buf[0]) && (len + num < sizeof passwd)) { 
 					memcpy(passwd + len, buf, num);
 					len += num;
 				}