initial commit

15 files changed, 1333 insertions, 0 deletions

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..2e4419b
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,24 @@
+MIT/X Consortium License
+
+© 2015-2016 Markus Teich <markus.teich@stusta.mhn.de>
+© 2014 Dimitris Papastamos <sin@2f30.org>
+© 2006-2014 Anselm R Garbe <anselm@garbe.us>
+© 2014-2016 Laslo Hunhold <dev@frign.de>
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b20fd4e
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,61 @@
+# slock - simple screen locker
+# See LICENSE file for copyright and license details.
+
+include config.mk
+
+SRC = slock.c ${COMPATSRC}
+OBJ = ${SRC:.c=.o}
+
+all: options slock
+
+options:
+	@echo slock build options:
+	@echo "CFLAGS   = ${CFLAGS}"
+	@echo "LDFLAGS  = ${LDFLAGS}"
+	@echo "CC       = ${CC}"
+
+.c.o:
+	@echo CC $<
+	@${CC} -c ${CFLAGS} $<
+
+${OBJ}: config.h config.mk arg.h util.h
+
+config.h:
+	@echo creating $@ from config.def.h
+	@cp config.def.h $@
+
+slock: ${OBJ}
+	@echo CC -o $@
+	@${CC} -o $@ ${OBJ} ${LDFLAGS}
+
+clean:
+	@echo cleaning
+	@rm -f slock ${OBJ} slock-${VERSION}.tar.gz
+
+dist: clean
+	@echo creating dist tarball
+	@mkdir -p slock-${VERSION}
+	@cp -R LICENSE Makefile README slock.1 config.mk \
+		${SRC} config.def.h arg.h util.h slock-${VERSION}
+	@tar -cf slock-${VERSION}.tar slock-${VERSION}
+	@gzip slock-${VERSION}.tar
+	@rm -rf slock-${VERSION}
+
+install: all
+	@echo installing executable file to ${DESTDIR}${PREFIX}/bin
+	@mkdir -p ${DESTDIR}${PREFIX}/bin
+	@cp -f slock ${DESTDIR}${PREFIX}/bin
+	@chmod 755 ${DESTDIR}${PREFIX}/bin/slock
+	@chmod u+s ${DESTDIR}${PREFIX}/bin/slock
+	@echo installing manual page to ${DESTDIR}${MANPREFIX}/man1
+	@mkdir -p ${DESTDIR}${MANPREFIX}/man1
+	@sed "s/VERSION/${VERSION}/g" <slock.1 >${DESTDIR}${MANPREFIX}/man1/slock.1
+	@chmod 644 ${DESTDIR}${MANPREFIX}/man1/slock.1
+
+uninstall:
+	@echo removing executable file from ${DESTDIR}${PREFIX}/bin
+	@rm -f ${DESTDIR}${PREFIX}/bin/slock
+	@echo removing manual page from ${DESTDIR}${MANPREFIX}/man1
+	@rm -f ${DESTDIR}${MANPREFIX}/man1/slock.1
+
+.PHONY: all options clean dist install uninstall
diff --git a/README b/README
new file mode 100644
index 0000000..dcacd01
--- /dev/null
+++ b/README
@@ -0,0 +1,24 @@
+slock - simple screen locker
+============================
+simple screen locker utility for X.
+
+
+Requirements
+------------
+In order to build slock you need the Xlib header files.
+
+
+Installation
+------------
+Edit config.mk to match your local setup (slock is installed into
+the /usr/local namespace by default).
+
+Afterwards enter the following command to build and install slock
+(if necessary as root):
+
+    make clean install
+
+
+Running slock
+-------------
+Simply invoke the 'slock' command. To get out of it, enter your password.
diff --git a/arg.h b/arg.h
new file mode 100644
index 0000000..0b23c53
--- /dev/null
+++ b/arg.h
@@ -0,0 +1,65 @@
+/*
+ * Copy me if you can.
+ * by 20h
+ */
+
+#ifndef ARG_H__
+#define ARG_H__
+
+extern char *argv0;
+
+/* use main(int argc, char *argv[]) */
+#define ARGBEGIN	for (argv0 = *argv, argv++, argc--;\
+					argv[0] && argv[0][0] == '-'\
+					&& argv[0][1];\
+					argc--, argv++) {\
+				char argc_;\
+				char **argv_;\
+				int brk_;\
+				if (argv[0][1] == '-' && argv[0][2] == '\0') {\
+					argv++;\
+					argc--;\
+					break;\
+				}\
+				for (brk_ = 0, argv[0]++, argv_ = argv;\
+						argv[0][0] && !brk_;\
+						argv[0]++) {\
+					if (argv_ != argv)\
+						break;\
+					argc_ = argv[0][0];\
+					switch (argc_)
+
+/* Handles obsolete -NUM syntax */
+#define ARGNUM				case '0':\
+					case '1':\
+					case '2':\
+					case '3':\
+					case '4':\
+					case '5':\
+					case '6':\
+					case '7':\
+					case '8':\
+					case '9'
+
+#define ARGEND			}\
+			}
+
+#define ARGC()		argc_
+
+#define ARGNUMF()	(brk_ = 1, estrtonum(argv[0], 0, INT_MAX))
+
+#define EARGF(x)	((argv[0][1] == '\0' && argv[1] == NULL)?\
+				((x), abort(), (char *)0) :\
+				(brk_ = 1, (argv[0][1] != '\0')?\
+					(&argv[0][1]) :\
+					(argc--, argv++, argv[0])))
+
+#define ARGF()		((argv[0][1] == '\0' && argv[1] == NULL)?\
+				(char *)0 :\
+				(brk_ = 1, (argv[0][1] != '\0')?\
+					(&argv[0][1]) :\
+					(argc--, argv++, argv[0])))
+
+#define LNGARG()	&argv[0][0]
+
+#endif
diff --git a/config.def.h b/config.def.h
new file mode 100644
index 0000000..9855e21
--- /dev/null
+++ b/config.def.h
@@ -0,0 +1,12 @@
+/* user and group to drop privileges to */
+static const char *user  = "nobody";
+static const char *group = "nogroup";
+
+static const char *colorname[NUMCOLS] = {
+	[INIT] =   "black",     /* after initialization */
+	[INPUT] =  "#005577",   /* during input */
+	[FAILED] = "#CC3333",   /* wrong password */
+};
+
+/* treat a cleared input like a wrong password (color) */
+static const int failonclear = 1;
diff --git a/config.mk b/config.mk
new file mode 100644
index 0000000..1e1ca45
--- /dev/null
+++ b/config.mk
@@ -0,0 +1,32 @@
+# slock version
+VERSION = 1.5
+
+# Customize below to fit your system
+
+# paths
+PREFIX = /usr/local
+MANPREFIX = ${PREFIX}/share/man
+
+X11INC = /usr/X11R6/include
+X11LIB = /usr/X11R6/lib
+
+# includes and libs
+INCS = -I. -I/usr/include -I${X11INC}
+LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext -lXrandr
+
+# flags
+CPPFLAGS = -DVERSION=\"${VERSION}\" -D_DEFAULT_SOURCE -DHAVE_SHADOW_H
+CFLAGS = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
+LDFLAGS = -s ${LIBS}
+COMPATSRC = explicit_bzero.c
+
+# On OpenBSD and Darwin remove -lcrypt from LIBS
+#LIBS = -L/usr/lib -lc -L${X11LIB} -lX11 -lXext -lXrandr
+# On *BSD remove -DHAVE_SHADOW_H from CPPFLAGS
+# On NetBSD add -D_NETBSD_SOURCE to CPPFLAGS
+#CPPFLAGS = -DVERSION=\"${VERSION}\" -D_BSD_SOURCE -D_NETBSD_SOURCE
+# On OpenBSD set COMPATSRC to empty
+#COMPATSRC =
+
+# compiler and linker
+CC = cc
diff --git a/explicit_bzero.c b/explicit_bzero.c
new file mode 100644
index 0000000..3e33ca8
--- /dev/null
+++ b/explicit_bzero.c
@@ -0,0 +1,19 @@
+/*	$OpenBSD: explicit_bzero.c,v 1.3 2014/06/21 02:34:26 matthew Exp $ */
+/*
+ * Public domain.
+ * Written by Matthew Dempsky.
+ */
+
+#include <string.h>
+
+__attribute__((weak)) void
+__explicit_bzero_hook(void *buf, size_t len)
+{
+}
+
+void
+explicit_bzero(void *buf, size_t len)
+{
+	memset(buf, 0, len);
+	__explicit_bzero_hook(buf, len);
+}
diff --git a/slock-blur_pixelated_screen-1.4.diff b/slock-blur_pixelated_screen-1.4.diff
new file mode 100644
index 0000000..90d9c16
--- /dev/null
+++ b/slock-blur_pixelated_screen-1.4.diff
@@ -0,0 +1,356 @@
+From 36a4863f9a399740aaf8b1e01926485c0a055e1c Mon Sep 17 00:00:00 2001
+From: Lars Niesen <iah71niesen@gso-koeln.de>
+Date: Wed, 29 Apr 2020 13:52:42 +0200
+Subject: [PATCH 1/8] Added Bg patch and screenshot capabilities
+
+---
+ config.mk |  2 +-
+ slock.c   | 35 +++++++++++++++++++++++++++++++----
+ 2 files changed, 32 insertions(+), 5 deletions(-)
+
+diff --git a/config.mk b/config.mk
+index 74429ae..987819e 100644
+--- a/config.mk
++++ b/config.mk
+@@ -12,7 +12,7 @@ X11LIB = /usr/X11R6/lib
+ 
+ # includes and libs
+ INCS = -I. -I/usr/include -I${X11INC}
+-LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext -lXrandr
++LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext -lXrandr -lImlib2
+ 
+ # flags
+ CPPFLAGS = -DVERSION=\"${VERSION}\" -D_DEFAULT_SOURCE -DHAVE_SHADOW_H
+diff --git a/slock.c b/slock.c
+index 5ae738c..7c63f34 100644
+--- a/slock.c
++++ b/slock.c
+@@ -18,6 +18,7 @@
+ #include <X11/keysym.h>
+ #include <X11/Xlib.h>
+ #include <X11/Xutil.h>
++#include <Imlib2.h>
+ 
+ #include "arg.h"
+ #include "util.h"
+@@ -35,6 +36,7 @@ struct lock {
+ 	int screen;
+ 	Window root, win;
+ 	Pixmap pmap;
++	Pixmap bgmap;
+ 	unsigned long colors[NUMCOLS];
+ };
+ 
+@@ -46,6 +48,8 @@ struct xrandr {
+ 
+ #include "config.h"
+ 
++Imlib_Image image;
++
+ static void
+ die(const char *errstr, ...)
+ {
+@@ -190,9 +194,10 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+ 			color = len ? INPUT : ((failure || failonclear) ? FAILED : INIT);
+ 			if (running && oldc != color) {
+ 				for (screen = 0; screen < nscreens; screen++) {
+-					XSetWindowBackground(dpy,
+-					                     locks[screen]->win,
+-					                     locks[screen]->colors[color]);
++                    if(locks[screen]->bgmap)
++                        XSetWindowBackgroundPixmap(dpy, locks[screen]->win, locks[screen]->bgmap);
++                    else
++                        XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[0]);
+ 					XClearWindow(dpy, locks[screen]->win);
+ 				}
+ 				oldc = color;
+@@ -235,6 +240,17 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
+ 	lock->screen = screen;
+ 	lock->root = RootWindow(dpy, lock->screen);
+ 
++    if(image) 
++    {
++        lock->bgmap = XCreatePixmap(dpy, lock->root, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen), DefaultDepth(dpy, lock->screen));
++        imlib_context_set_image(image);
++        imlib_context_set_display(dpy);
++        imlib_context_set_visual(DefaultVisual(dpy, lock->screen));
++        imlib_context_set_colormap(DefaultColormap(dpy, lock->screen));
++        imlib_context_set_drawable(lock->bgmap);
++        imlib_render_image_on_drawable(0, 0);
++        imlib_free_image();
++    }
+ 	for (i = 0; i < NUMCOLS; i++) {
+ 		XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen),
+ 		                 colorname[i], &color, &dummy);
+@@ -251,6 +267,8 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
+ 	                          CopyFromParent,
+ 	                          DefaultVisual(dpy, lock->screen),
+ 	                          CWOverrideRedirect | CWBackPixel, &wa);
++    if(lock->bgmap)
++        XSetWindowBackgroundPixmap(dpy, lock->win, lock->bgmap);
+ 	lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
+ 	invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap,
+ 	                                &color, &color, 0, 0);
+@@ -354,7 +372,16 @@ main(int argc, char **argv) {
+ 		die("slock: setgid: %s\n", strerror(errno));
+ 	if (setuid(duid) < 0)
+ 		die("slock: setuid: %s\n", strerror(errno));
+-
++		
++	/*Create screenshot Image*/
++	Screen *scr = ScreenOfDisplay(dpy, DefaultScreen(dpy));
++	image = imlib_create_image(scr->width,scr->height);
++	imlib_context_set_image(image);
++	imlib_context_set_display(dpy);
++	imlib_context_set_visual(DefaultVisual(dpy,0));
++	imlib_context_set_drawable(RootWindow(dpy,XScreenNumberOfScreen(scr)));	
++	imlib_copy_drawable_to_image(0,0,0,scr->width,scr->height,0,0,1);
++	
+ 	/* check for Xrandr support */
+ 	rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
+ 
+-- 
+2.27.0
+
+
+From 9d89604ac52b0949d047dae2f9b78cb5085ee1a2 Mon Sep 17 00:00:00 2001
+From: Lars Niesen <iah71niesen@gso-koeln.de>
+Date: Wed, 29 Apr 2020 14:15:59 +0200
+Subject: [PATCH 2/8] Added blur function
+
+---
+ config.def.h | 3 +++
+ slock.c      | 3 ++-
+ 2 files changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/config.def.h b/config.def.h
+index c8e52d6..fcc1b39 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -10,3 +10,6 @@ static const char *colorname[NUMCOLS] = {
+ 
+ /* treat a cleared input like a wrong password (color) */
+ static const int failonclear = 1;
++
++/*Set Blur radius*/
++static const int blurRadius=5;
+\ No newline at end of file
+diff --git a/slock.c b/slock.c
+index 7c63f34..0f24cd7 100644
+--- a/slock.c
++++ b/slock.c
+@@ -372,7 +372,7 @@ main(int argc, char **argv) {
+ 		die("slock: setgid: %s\n", strerror(errno));
+ 	if (setuid(duid) < 0)
+ 		die("slock: setuid: %s\n", strerror(errno));
+-		
++
+ 	/*Create screenshot Image*/
+ 	Screen *scr = ScreenOfDisplay(dpy, DefaultScreen(dpy));
+ 	image = imlib_create_image(scr->width,scr->height);
+@@ -381,6 +381,7 @@ main(int argc, char **argv) {
+ 	imlib_context_set_visual(DefaultVisual(dpy,0));
+ 	imlib_context_set_drawable(RootWindow(dpy,XScreenNumberOfScreen(scr)));	
+ 	imlib_copy_drawable_to_image(0,0,0,scr->width,scr->height,0,0,1);
++	imlib_image_blur(blurRadius);
+ 	
+ 	/* check for Xrandr support */
+ 	rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
+-- 
+2.27.0
+
+
+From 069aabd7e30244befd4efe74c85d3468ed076c21 Mon Sep 17 00:00:00 2001
+From: Lars Niesen <iah71niesen@gso-koeln.de>
+Date: Wed, 29 Apr 2020 17:33:09 +0200
+Subject: [PATCH 4/8] added Pixelation
+
+---
+ config.def.h |  3 ++-
+ slock.c      | 42 ++++++++++++++++++++++++++++++++++++++++++
+ 2 files changed, 44 insertions(+), 1 deletion(-)
+
+diff --git a/config.def.h b/config.def.h
+index fcc1b39..1c1aef3 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -12,4 +12,5 @@ static const char *colorname[NUMCOLS] = {
+ static const int failonclear = 1;
+ 
+ /*Set Blur radius*/
+-static const int blurRadius=5;
+\ No newline at end of file
++static const int blurRadius=0;
++static const int pixelSize=5;
+diff --git a/slock.c b/slock.c
+index 0f24cd7..33ca569 100644
+--- a/slock.c
++++ b/slock.c
+@@ -381,7 +381,49 @@ main(int argc, char **argv) {
+ 	imlib_context_set_visual(DefaultVisual(dpy,0));
+ 	imlib_context_set_drawable(RootWindow(dpy,XScreenNumberOfScreen(scr)));	
+ 	imlib_copy_drawable_to_image(0,0,0,scr->width,scr->height,0,0,1);
++	
++	/*Blur function*/
+ 	imlib_image_blur(blurRadius);
++
++
++	/*Pixelation*/
++	int width = scr->width;
++	int height = scr->height;
++	
++	for(int y = 0; y < height; y += pixelSize)
++	{
++		for(int x = 0; x < width; x += pixelSize)
++		{
++			int red = 0;
++			int green = 0;
++			int blue = 0;
++
++			Imlib_Color pixel; 
++			Imlib_Color* pp;
++			pp = &pixel;
++			for(int j = 0; j < pixelSize && j < height; j++)
++			{
++				for(int i = 0; i < pixelSize && i < width; i++)
++				{
++					imlib_image_query_pixel(x+i,y+j,pp);
++					red += pixel.red;
++					green += pixel.green;
++					blue += pixel.blue;
++				}
++			}
++			red /= (pixelSize*pixelSize);
++			green /= (pixelSize*pixelSize);
++			blue /= (pixelSize*pixelSize);
++			printf("R/G/B: %i/%i/%i\n",red,green,blue);
++			imlib_context_set_color(red,green,blue,pixel.alpha);
++			imlib_image_fill_rectangle(x,y,pixelSize,pixelSize);
++			red = 0;
++			green = 0;
++			blue = 0;
++		}
++	}
++	
++	
+ 	
+ 	/* check for Xrandr support */
+ 	rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
+-- 
+2.27.0
+
+
+From 109bac015c1c7fbf8440fb42588fe7e0e9cb5e62 Mon Sep 17 00:00:00 2001
+From: Lars Niesen <iah71niesen@gso-koeln.de>
+Date: Wed, 29 Apr 2020 17:42:39 +0200
+Subject: [PATCH 6/8] removed debug printf
+
+---
+ slock.c | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/slock.c b/slock.c
+index 33ca569..f54c459 100644
+--- a/slock.c
++++ b/slock.c
+@@ -414,7 +414,6 @@ main(int argc, char **argv) {
+ 			red /= (pixelSize*pixelSize);
+ 			green /= (pixelSize*pixelSize);
+ 			blue /= (pixelSize*pixelSize);
+-			printf("R/G/B: %i/%i/%i\n",red,green,blue);
+ 			imlib_context_set_color(red,green,blue,pixel.alpha);
+ 			imlib_image_fill_rectangle(x,y,pixelSize,pixelSize);
+ 			red = 0;
+-- 
+2.27.0
+
+
+From a13a0f4ac86f82e4dff145b7ebd93e52d07492c9 Mon Sep 17 00:00:00 2001
+From: Lars Niesen <iah71niesen@gso-koeln.de>
+Date: Sun, 3 May 2020 18:03:38 +0200
+Subject: [PATCH 7/8] Changed compilerflag to fast
+
+---
+ config.mk | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/config.mk b/config.mk
+index 987819e..d0c2f01 100644
+--- a/config.mk
++++ b/config.mk
+@@ -16,7 +16,7 @@ LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext -lXrandr -lImlib2
+ 
+ # flags
+ CPPFLAGS = -DVERSION=\"${VERSION}\" -D_DEFAULT_SOURCE -DHAVE_SHADOW_H
+-CFLAGS = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
++CFLAGS = -std=c99 -pedantic -Wall -Ofast ${INCS} ${CPPFLAGS}
+ LDFLAGS = -s ${LIBS}
+ COMPATSRC = explicit_bzero.c
+ 
+-- 
+2.27.0
+
+
+From 31a7001c4954606c066cc3df4318fafd6d216bcd Mon Sep 17 00:00:00 2001
+From: Lars Niesen <iah71niesen@gso-koeln.de>
+Date: Mon, 4 May 2020 10:00:40 +0200
+Subject: [PATCH 8/8] Added defines for BLUR/PIXELATION to remove from code by
+ compilation
+
+---
+ config.def.h | 11 ++++++++---
+ slock.c      |  9 ++++++---
+ 2 files changed, 14 insertions(+), 6 deletions(-)
+
+diff --git a/config.def.h b/config.def.h
+index 1c1aef3..5407953 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -11,6 +11,11 @@ static const char *colorname[NUMCOLS] = {
+ /* treat a cleared input like a wrong password (color) */
+ static const int failonclear = 1;
+ 
+-/*Set Blur radius*/
+-static const int blurRadius=0;
+-static const int pixelSize=5;
++/*Enable blur*/
++#define BLUR
++/*Set blur radius*/
++static const int blurRadius=5;
++/*Enable Pixelation*/
++//#define PIXELATION
++/*Set pixelation radius*/
++static const int pixelSize=0;
+diff --git a/slock.c b/slock.c
+index f54c459..1a4d6e3 100644
+--- a/slock.c
++++ b/slock.c
+@@ -381,11 +381,14 @@ main(int argc, char **argv) {
+ 	imlib_context_set_visual(DefaultVisual(dpy,0));
+ 	imlib_context_set_drawable(RootWindow(dpy,XScreenNumberOfScreen(scr)));	
+ 	imlib_copy_drawable_to_image(0,0,0,scr->width,scr->height,0,0,1);
+-	
++
++#ifdef BLUR
++
+ 	/*Blur function*/
+ 	imlib_image_blur(blurRadius);
++#endif // BLUR	
+ 
+-
++#ifdef PIXELATION
+ 	/*Pixelation*/
+ 	int width = scr->width;
+ 	int height = scr->height;
+@@ -423,7 +426,7 @@ main(int argc, char **argv) {
+ 	}
+ 	
+ 	
+-	
++#endif
+ 	/* check for Xrandr support */
+ 	rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
+ 
+-- 
+2.27.0
+
diff --git a/slock-capscolor-20220921-35633d4 (1).diff b/slock-capscolor-20220921-35633d4 (1).diff
new file mode 100644
index 0000000..e463747
--- /dev/null
+++ b/slock-capscolor-20220921-35633d4 (1).diff
@@ -0,0 +1,88 @@
+From da1721b1b4bb0aa8f94537ddd2a3eada1df00a30 Mon Sep 17 00:00:00 2001
+From: Max Schillinger <maxschillinger@web.de>
+Date: Wed, 21 Sep 2022 19:56:58 +0200
+Subject: [PATCH] Update capscolor patch to match the latest slock commit
+ (35633d4)
+
+---
+ config.def.h |  1 +
+ slock.c      | 15 ++++++++++++---
+ 2 files changed, 13 insertions(+), 3 deletions(-)
+
+diff --git a/config.def.h b/config.def.h
+index 9855e21..6288856 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -6,6 +6,7 @@ static const char *colorname[NUMCOLS] = {
+ 	[INIT] =   "black",     /* after initialization */
+ 	[INPUT] =  "#005577",   /* during input */
+ 	[FAILED] = "#CC3333",   /* wrong password */
++	[CAPS] = "red",         /* CapsLock on */
+ };
+ 
+ /* treat a cleared input like a wrong password (color) */
+diff --git a/slock.c b/slock.c
+index 5ae738c..5f4fb7a 100644
+--- a/slock.c
++++ b/slock.c
+@@ -18,6 +18,7 @@
+ #include <X11/keysym.h>
+ #include <X11/Xlib.h>
+ #include <X11/Xutil.h>
++#include <X11/XKBlib.h>
+ 
+ #include "arg.h"
+ #include "util.h"
+@@ -28,6 +29,7 @@ enum {
+ 	INIT,
+ 	INPUT,
+ 	FAILED,
++	CAPS,
+ 	NUMCOLS
+ };
+ 
+@@ -130,16 +132,20 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+ {
+ 	XRRScreenChangeNotifyEvent *rre;
+ 	char buf[32], passwd[256], *inputhash;
+-	int num, screen, running, failure, oldc;
+-	unsigned int len, color;
++	int caps, num, screen, running, failure, oldc;
++	unsigned int len, color, indicators;
+ 	KeySym ksym;
+ 	XEvent ev;
+ 
+ 	len = 0;
++	caps = 0;
+ 	running = 1;
+ 	failure = 0;
+ 	oldc = INIT;
+ 
++	if (!XkbGetIndicatorState(dpy, XkbUseCoreKbd, &indicators))
++		caps = indicators & 1;
++
+ 	while (running && !XNextEvent(dpy, &ev)) {
+ 		if (ev.type == KeyPress) {
+ 			explicit_bzero(&buf, sizeof(buf));
+@@ -179,6 +185,9 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+ 				if (len)
+ 					passwd[--len] = '\0';
+ 				break;
++			case XK_Caps_Lock:
++				caps = !caps;
++				break;
+ 			default:
+ 				if (num && !iscntrl((int)buf[0]) &&
+ 				    (len + num < sizeof(passwd))) {
+@@ -187,7 +196,7 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+ 				}
+ 				break;
+ 			}
+-			color = len ? INPUT : ((failure || failonclear) ? FAILED : INIT);
++			color = len ? (caps ? CAPS : INPUT) : (failure || failonclear ? FAILED : INIT);
+ 			if (running && oldc != color) {
+ 				for (screen = 0; screen < nscreens; screen++) {
+ 					XSetWindowBackground(dpy,
+-- 
+2.37.3
+
diff --git a/slock-capscolor-20220921-35633d4.diff b/slock-capscolor-20220921-35633d4.diff
new file mode 100644
index 0000000..e463747
--- /dev/null
+++ b/slock-capscolor-20220921-35633d4.diff
@@ -0,0 +1,88 @@
+From da1721b1b4bb0aa8f94537ddd2a3eada1df00a30 Mon Sep 17 00:00:00 2001
+From: Max Schillinger <maxschillinger@web.de>
+Date: Wed, 21 Sep 2022 19:56:58 +0200
+Subject: [PATCH] Update capscolor patch to match the latest slock commit
+ (35633d4)
+
+---
+ config.def.h |  1 +
+ slock.c      | 15 ++++++++++++---
+ 2 files changed, 13 insertions(+), 3 deletions(-)
+
+diff --git a/config.def.h b/config.def.h
+index 9855e21..6288856 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -6,6 +6,7 @@ static const char *colorname[NUMCOLS] = {
+ 	[INIT] =   "black",     /* after initialization */
+ 	[INPUT] =  "#005577",   /* during input */
+ 	[FAILED] = "#CC3333",   /* wrong password */
++	[CAPS] = "red",         /* CapsLock on */
+ };
+ 
+ /* treat a cleared input like a wrong password (color) */
+diff --git a/slock.c b/slock.c
+index 5ae738c..5f4fb7a 100644
+--- a/slock.c
++++ b/slock.c
+@@ -18,6 +18,7 @@
+ #include <X11/keysym.h>
+ #include <X11/Xlib.h>
+ #include <X11/Xutil.h>
++#include <X11/XKBlib.h>
+ 
+ #include "arg.h"
+ #include "util.h"
+@@ -28,6 +29,7 @@ enum {
+ 	INIT,
+ 	INPUT,
+ 	FAILED,
++	CAPS,
+ 	NUMCOLS
+ };
+ 
+@@ -130,16 +132,20 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+ {
+ 	XRRScreenChangeNotifyEvent *rre;
+ 	char buf[32], passwd[256], *inputhash;
+-	int num, screen, running, failure, oldc;
+-	unsigned int len, color;
++	int caps, num, screen, running, failure, oldc;
++	unsigned int len, color, indicators;
+ 	KeySym ksym;
+ 	XEvent ev;
+ 
+ 	len = 0;
++	caps = 0;
+ 	running = 1;
+ 	failure = 0;
+ 	oldc = INIT;
+ 
++	if (!XkbGetIndicatorState(dpy, XkbUseCoreKbd, &indicators))
++		caps = indicators & 1;
++
+ 	while (running && !XNextEvent(dpy, &ev)) {
+ 		if (ev.type == KeyPress) {
+ 			explicit_bzero(&buf, sizeof(buf));
+@@ -179,6 +185,9 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+ 				if (len)
+ 					passwd[--len] = '\0';
+ 				break;
++			case XK_Caps_Lock:
++				caps = !caps;
++				break;
+ 			default:
+ 				if (num && !iscntrl((int)buf[0]) &&
+ 				    (len + num < sizeof(passwd))) {
+@@ -187,7 +196,7 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+ 				}
+ 				break;
+ 			}
+-			color = len ? INPUT : ((failure || failonclear) ? FAILED : INIT);
++			color = len ? (caps ? CAPS : INPUT) : (failure || failonclear ? FAILED : INIT);
+ 			if (running && oldc != color) {
+ 				for (screen = 0; screen < nscreens; screen++) {
+ 					XSetWindowBackground(dpy,
+-- 
+2.37.3
+
diff --git a/slock-dpms-1.4.diff b/slock-dpms-1.4.diff
new file mode 100644
index 0000000..027bbf7
--- /dev/null
+++ b/slock-dpms-1.4.diff
@@ -0,0 +1,62 @@
+diff --git a/config.def.h b/config.def.h
+index 9855e21..d01bd38 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -10,3 +10,6 @@ static const char *colorname[NUMCOLS] = {
+ 
+ /* treat a cleared input like a wrong password (color) */
+ static const int failonclear = 1;
++
++/* time in seconds before the monitor shuts down */
++static const int monitortime = 5;
+diff --git a/slock.c b/slock.c
+index d2f0886..f65a43b 100644
+--- a/slock.c
++++ b/slock.c
+@@ -15,6 +15,7 @@
+ #include <unistd.h>
+ #include <sys/types.h>
+ #include <X11/extensions/Xrandr.h>
++#include <X11/extensions/dpms.h>
+ #include <X11/keysym.h>
+ #include <X11/Xlib.h>
+ #include <X11/Xutil.h>
+@@ -306,6 +307,7 @@ main(int argc, char **argv) {
+ 	const char *hash;
+ 	Display *dpy;
+ 	int s, nlocks, nscreens;
++	CARD16 standby, suspend, off;
+ 
+ 	ARGBEGIN {
+ 	case 'v':
+@@ -366,6 +368,20 @@ main(int argc, char **argv) {
+ 	if (nlocks != nscreens)
+ 		return 1;
+ 
++	/* DPMS magic to disable the monitor */
++	if (!DPMSCapable(dpy))
++		die("slock: DPMSCapable failed\n");
++	if (!DPMSEnable(dpy))
++		die("slock: DPMSEnable failed\n");
++	if (!DPMSGetTimeouts(dpy, &standby, &suspend, &off))
++		die("slock: DPMSGetTimeouts failed\n");
++	if (!standby || !suspend || !off)
++		die("slock: at least one DPMS variable is zero\n");
++	if (!DPMSSetTimeouts(dpy, monitortime, monitortime, monitortime))
++		die("slock: DPMSSetTimeouts failed\n");
++
++	XSync(dpy, 0);
++
+ 	/* run post-lock command */
+ 	if (argc > 0) {
+ 		switch (fork()) {
+@@ -383,5 +399,9 @@ main(int argc, char **argv) {
+ 	/* everything is now blank. Wait for the correct password */
+ 	readpw(dpy, &rr, locks, nscreens, hash);
+ 
++	/* reset DPMS values to inital ones */
++	DPMSSetTimeouts(dpy, standby, suspend, off);
++	XSync(dpy, 0);
++
+ 	return 0;
+ }
diff --git a/slock-quickcancel-1.4.diff b/slock-quickcancel-1.4.diff
new file mode 100644
index 0000000..f990806
--- /dev/null
+++ b/slock-quickcancel-1.4.diff
@@ -0,0 +1,66 @@
+From e37f8981efe54bc620cb2f2280832cdab3959a32 Mon Sep 17 00:00:00 2001
+From: aleks <aleks.stier@icloud.com>
+Date: Thu, 10 Oct 2019 17:35:27 +0200
+Subject: [PATCH] Apply quickcancel
+
+Cancel slock by moving the mouse within a certain time-period after
+slock started. The time-period can be defined in seconds with the
+setting *timetocancel* in the config.h. This is useful if you forgot to
+disable `xautolock` during an activity that requires no input (e.g.
+reading text, watching video).
+---
+ config.def.h | 3 +++
+ slock.c      | 5 +++++
+ 2 files changed, 8 insertions(+)
+
+diff --git a/config.def.h b/config.def.h
+index 9855e21..e0bf95a 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -10,3 +10,6 @@ static const char *colorname[NUMCOLS] = {
+ 
+ /* treat a cleared input like a wrong password (color) */
+ static const int failonclear = 1;
++
++/* time in seconds to cancel lock with mouse movement */
++static const int timetocancel = 4;
+diff --git a/slock.c b/slock.c
+index d2f0886..f7462ee 100644
+--- a/slock.c
++++ b/slock.c
+@@ -13,6 +13,7 @@
+ #include <stdio.h>
+ #include <string.h>
+ #include <unistd.h>
++#include <time.h>
+ #include <sys/types.h>
+ #include <X11/extensions/Xrandr.h>
+ #include <X11/keysym.h>
+@@ -24,6 +25,8 @@
+ 
+ char *argv0;
+ 
++static time_t locktime;
++
+ enum {
+ 	INIT,
+ 	INPUT,
+@@ -141,6 +144,7 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+ 	oldc = INIT;
+ 
+ 	while (running && !XNextEvent(dpy, &ev)) {
++		running = !((time(NULL) - locktime < timetocancel) && (ev.type == MotionNotify));
+ 		if (ev.type == KeyPress) {
+ 			explicit_bzero(&buf, sizeof(buf));
+ 			num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
+@@ -268,6 +272,7 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
+ 				XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
+ 
+ 			XSelectInput(dpy, lock->root, SubstructureNotifyMask);
++			locktime = time(NULL);
+ 			return lock;
+ 		}
+ 
+-- 
+2.23.0
+
diff --git a/slock.1 b/slock.1
new file mode 100644
index 0000000..82cdcd6
--- /dev/null
+++ b/slock.1
@@ -0,0 +1,39 @@
+.Dd 2016-08-23
+.Dt SLOCK 1
+.Sh NAME
+.Nm slock
+.Nd simple X screen locker
+.Sh SYNOPSIS
+.Nm
+.Op Fl v
+.Op Ar cmd Op Ar arg ...
+.Sh DESCRIPTION
+.Nm
+is a simple X screen locker. If provided,
+.Ar cmd Op Ar arg ...
+is executed after the screen has been locked.
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl v
+Print version information to stdout and exit.
+.El
+.Sh SECURITY CONSIDERATIONS
+To make sure a locked screen can not be bypassed by switching VTs
+or killing the X server with Ctrl+Alt+Backspace, it is recommended
+to disable both in
+.Xr xorg.conf 5
+for maximum security:
+.Bd -literal -offset left
+Section "ServerFlags"
+	Option "DontVTSwitch" "True"
+	Option "DontZap"      "True"
+EndSection
+.Ed
+.Sh EXAMPLES
+$
+.Nm
+/usr/sbin/s2ram
+.Sh CUSTOMIZATION
+.Nm
+can be customized by creating a custom config.h from config.def.h and
+(re)compiling the source code. This keeps it fast, secure and simple.
diff --git a/slock.c b/slock.c
new file mode 100644
index 0000000..5ae738c
--- /dev/null
+++ b/slock.c
@@ -0,0 +1,395 @@
+/* See LICENSE file for license details. */
+#define _XOPEN_SOURCE 500
+#if HAVE_SHADOW_H
+#include <shadow.h>
+#endif
+
+#include <ctype.h>
+#include <errno.h>
+#include <grp.h>
+#include <pwd.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <X11/extensions/Xrandr.h>
+#include <X11/keysym.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+#include "arg.h"
+#include "util.h"
+
+char *argv0;
+
+enum {
+	INIT,
+	INPUT,
+	FAILED,
+	NUMCOLS
+};
+
+struct lock {
+	int screen;
+	Window root, win;
+	Pixmap pmap;
+	unsigned long colors[NUMCOLS];
+};
+
+struct xrandr {
+	int active;
+	int evbase;
+	int errbase;
+};
+
+#include "config.h"
+
+static void
+die(const char *errstr, ...)
+{
+	va_list ap;
+
+	va_start(ap, errstr);
+	vfprintf(stderr, errstr, ap);
+	va_end(ap);
+	exit(1);
+}
+
+#ifdef __linux__
+#include <fcntl.h>
+#include <linux/oom.h>
+
+static void
+dontkillme(void)
+{
+	FILE *f;
+	const char oomfile[] = "/proc/self/oom_score_adj";
+
+	if (!(f = fopen(oomfile, "w"))) {
+		if (errno == ENOENT)
+			return;
+		die("slock: fopen %s: %s\n", oomfile, strerror(errno));
+	}
+	fprintf(f, "%d", OOM_SCORE_ADJ_MIN);
+	if (fclose(f)) {
+		if (errno == EACCES)
+			die("slock: unable to disable OOM killer. "
+			    "Make sure to suid or sgid slock.\n");
+		else
+			die("slock: fclose %s: %s\n", oomfile, strerror(errno));
+	}
+}
+#endif
+
+static const char *
+gethash(void)
+{
+	const char *hash;
+	struct passwd *pw;
+
+	/* Check if the current user has a password entry */
+	errno = 0;
+	if (!(pw = getpwuid(getuid()))) {
+		if (errno)
+			die("slock: getpwuid: %s\n", strerror(errno));
+		else
+			die("slock: cannot retrieve password entry\n");
+	}
+	hash = pw->pw_passwd;
+
+#if HAVE_SHADOW_H
+	if (!strcmp(hash, "x")) {
+		struct spwd *sp;
+		if (!(sp = getspnam(pw->pw_name)))
+			die("slock: getspnam: cannot retrieve shadow entry. "
+			    "Make sure to suid or sgid slock.\n");
+		hash = sp->sp_pwdp;
+	}
+#else
+	if (!strcmp(hash, "*")) {
+#ifdef __OpenBSD__
+		if (!(pw = getpwuid_shadow(getuid())))
+			die("slock: getpwnam_shadow: cannot retrieve shadow entry. "
+			    "Make sure to suid or sgid slock.\n");
+		hash = pw->pw_passwd;
+#else
+		die("slock: getpwuid: cannot retrieve shadow entry. "
+		    "Make sure to suid or sgid slock.\n");
+#endif /* __OpenBSD__ */
+	}
+#endif /* HAVE_SHADOW_H */
+
+	return hash;
+}
+
+static void
+readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+       const char *hash)
+{
+	XRRScreenChangeNotifyEvent *rre;
+	char buf[32], passwd[256], *inputhash;
+	int num, screen, running, failure, oldc;
+	unsigned int len, color;
+	KeySym ksym;
+	XEvent ev;
+
+	len = 0;
+	running = 1;
+	failure = 0;
+	oldc = INIT;
+
+	while (running && !XNextEvent(dpy, &ev)) {
+		if (ev.type == KeyPress) {
+			explicit_bzero(&buf, sizeof(buf));
+			num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
+			if (IsKeypadKey(ksym)) {
+				if (ksym == XK_KP_Enter)
+					ksym = XK_Return;
+				else if (ksym >= XK_KP_0 && ksym <= XK_KP_9)
+					ksym = (ksym - XK_KP_0) + XK_0;
+			}
+			if (IsFunctionKey(ksym) ||
+			    IsKeypadKey(ksym) ||
+			    IsMiscFunctionKey(ksym) ||
+			    IsPFKey(ksym) ||
+			    IsPrivateKeypadKey(ksym))
+				continue;
+			switch (ksym) {
+			case XK_Return:
+				passwd[len] = '\0';
+				errno = 0;
+				if (!(inputhash = crypt(passwd, hash)))
+					fprintf(stderr, "slock: crypt: %s\n", strerror(errno));
+				else
+					running = !!strcmp(inputhash, hash);
+				if (running) {
+					XBell(dpy, 100);
+					failure = 1;
+				}
+				explicit_bzero(&passwd, sizeof(passwd));
+				len = 0;
+				break;
+			case XK_Escape:
+				explicit_bzero(&passwd, sizeof(passwd));
+				len = 0;
+				break;
+			case XK_BackSpace:
+				if (len)
+					passwd[--len] = '\0';
+				break;
+			default:
+				if (num && !iscntrl((int)buf[0]) &&
+				    (len + num < sizeof(passwd))) {
+					memcpy(passwd + len, buf, num);
+					len += num;
+				}
+				break;
+			}
+			color = len ? INPUT : ((failure || failonclear) ? FAILED : INIT);
+			if (running && oldc != color) {
+				for (screen = 0; screen < nscreens; screen++) {
+					XSetWindowBackground(dpy,
+					                     locks[screen]->win,
+					                     locks[screen]->colors[color]);
+					XClearWindow(dpy, locks[screen]->win);
+				}
+				oldc = color;
+			}
+		} else if (rr->active && ev.type == rr->evbase + RRScreenChangeNotify) {
+			rre = (XRRScreenChangeNotifyEvent*)&ev;
+			for (screen = 0; screen < nscreens; screen++) {
+				if (locks[screen]->win == rre->window) {
+					if (rre->rotation == RR_Rotate_90 ||
+					    rre->rotation == RR_Rotate_270)
+						XResizeWindow(dpy, locks[screen]->win,
+						              rre->height, rre->width);
+					else
+						XResizeWindow(dpy, locks[screen]->win,
+						              rre->width, rre->height);
+					XClearWindow(dpy, locks[screen]->win);
+					break;
+				}
+			}
+		} else {
+			for (screen = 0; screen < nscreens; screen++)
+				XRaiseWindow(dpy, locks[screen]->win);
+		}
+	}
+}
+
+static struct lock *
+lockscreen(Display *dpy, struct xrandr *rr, int screen)
+{
+	char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
+	int i, ptgrab, kbgrab;
+	struct lock *lock;
+	XColor color, dummy;
+	XSetWindowAttributes wa;
+	Cursor invisible;
+
+	if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(struct lock))))
+		return NULL;
+
+	lock->screen = screen;
+	lock->root = RootWindow(dpy, lock->screen);
+
+	for (i = 0; i < NUMCOLS; i++) {
+		XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen),
+		                 colorname[i], &color, &dummy);
+		lock->colors[i] = color.pixel;
+	}
+
+	/* init */
+	wa.override_redirect = 1;
+	wa.background_pixel = lock->colors[INIT];
+	lock->win = XCreateWindow(dpy, lock->root, 0, 0,
+	                          DisplayWidth(dpy, lock->screen),
+	                          DisplayHeight(dpy, lock->screen),
+	                          0, DefaultDepth(dpy, lock->screen),
+	                          CopyFromParent,
+	                          DefaultVisual(dpy, lock->screen),
+	                          CWOverrideRedirect | CWBackPixel, &wa);
+	lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
+	invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap,
+	                                &color, &color, 0, 0);
+	XDefineCursor(dpy, lock->win, invisible);
+
+	/* Try to grab mouse pointer *and* keyboard for 600ms, else fail the lock */
+	for (i = 0, ptgrab = kbgrab = -1; i < 6; i++) {
+		if (ptgrab != GrabSuccess) {
+			ptgrab = XGrabPointer(dpy, lock->root, False,
+			                      ButtonPressMask | ButtonReleaseMask |
+			                      PointerMotionMask, GrabModeAsync,
+			                      GrabModeAsync, None, invisible, CurrentTime);
+		}
+		if (kbgrab != GrabSuccess) {
+			kbgrab = XGrabKeyboard(dpy, lock->root, True,
+			                       GrabModeAsync, GrabModeAsync, CurrentTime);
+		}
+
+		/* input is grabbed: we can lock the screen */
+		if (ptgrab == GrabSuccess && kbgrab == GrabSuccess) {
+			XMapRaised(dpy, lock->win);
+			if (rr->active)
+				XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
+
+			XSelectInput(dpy, lock->root, SubstructureNotifyMask);
+			return lock;
+		}
+
+		/* retry on AlreadyGrabbed but fail on other errors */
+		if ((ptgrab != AlreadyGrabbed && ptgrab != GrabSuccess) ||
+		    (kbgrab != AlreadyGrabbed && kbgrab != GrabSuccess))
+			break;
+
+		usleep(100000);
+	}
+
+	/* we couldn't grab all input: fail out */
+	if (ptgrab != GrabSuccess)
+		fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n",
+		        screen);
+	if (kbgrab != GrabSuccess)
+		fprintf(stderr, "slock: unable to grab keyboard for screen %d\n",
+		        screen);
+	return NULL;
+}
+
+static void
+usage(void)
+{
+	die("usage: slock [-v] [cmd [arg ...]]\n");
+}
+
+int
+main(int argc, char **argv) {
+	struct xrandr rr;
+	struct lock **locks;
+	struct passwd *pwd;
+	struct group *grp;
+	uid_t duid;
+	gid_t dgid;
+	const char *hash;
+	Display *dpy;
+	int s, nlocks, nscreens;
+
+	ARGBEGIN {
+	case 'v':
+		fprintf(stderr, "slock-"VERSION"\n");
+		return 0;
+	default:
+		usage();
+	} ARGEND
+
+	/* validate drop-user and -group */
+	errno = 0;
+	if (!(pwd = getpwnam(user)))
+		die("slock: getpwnam %s: %s\n", user,
+		    errno ? strerror(errno) : "user entry not found");
+	duid = pwd->pw_uid;
+	errno = 0;
+	if (!(grp = getgrnam(group)))
+		die("slock: getgrnam %s: %s\n", group,
+		    errno ? strerror(errno) : "group entry not found");
+	dgid = grp->gr_gid;
+
+#ifdef __linux__
+	dontkillme();
+#endif
+
+	hash = gethash();
+	errno = 0;
+	if (!crypt("", hash))
+		die("slock: crypt: %s\n", strerror(errno));
+
+	if (!(dpy = XOpenDisplay(NULL)))
+		die("slock: cannot open display\n");
+
+	/* drop privileges */
+	if (setgroups(0, NULL) < 0)
+		die("slock: setgroups: %s\n", strerror(errno));
+	if (setgid(dgid) < 0)
+		die("slock: setgid: %s\n", strerror(errno));
+	if (setuid(duid) < 0)
+		die("slock: setuid: %s\n", strerror(errno));
+
+	/* check for Xrandr support */
+	rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
+
+	/* get number of screens in display "dpy" and blank them */
+	nscreens = ScreenCount(dpy);
+	if (!(locks = calloc(nscreens, sizeof(struct lock *))))
+		die("slock: out of memory\n");
+	for (nlocks = 0, s = 0; s < nscreens; s++) {
+		if ((locks[s] = lockscreen(dpy, &rr, s)) != NULL)
+			nlocks++;
+		else
+			break;
+	}
+	XSync(dpy, 0);
+
+	/* did we manage to lock everything? */
+	if (nlocks != nscreens)
+		return 1;
+
+	/* run post-lock command */
+	if (argc > 0) {
+		switch (fork()) {
+		case -1:
+			die("slock: fork failed: %s\n", strerror(errno));
+		case 0:
+			if (close(ConnectionNumber(dpy)) < 0)
+				die("slock: close: %s\n", strerror(errno));
+			execvp(argv[0], argv);
+			fprintf(stderr, "slock: execvp %s: %s\n", argv[0], strerror(errno));
+			_exit(1);
+		}
+	}
+
+	/* everything is now blank. Wait for the correct password */
+	readpw(dpy, &rr, locks, nscreens, hash);
+
+	return 0;
+}
diff --git a/util.h b/util.h
new file mode 100644
index 0000000..6f748b8
--- /dev/null
+++ b/util.h
@@ -0,0 +1,2 @@
+#undef explicit_bzero
+void explicit_bzero(void *, size_t);