init

slock-1.6/LICENSE

@@ -0,0 +1,25 @@
+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>
+© 2016-2023 Hiltjo Posthuma <hiltjo@codemadness.org>
+
+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.

slock-1.6/Makefile

@@ -0,0 +1,50 @@
+# slock - simple screen locker
+# See LICENSE file for copyright and license details.
+
+include config.mk
+
+SRC = slock.c ${COMPATSRC}
+OBJ = ${SRC:.c=.o}
+
+all: slock
+
+.c.o:
+	${CC} -c ${CFLAGS} $<
+
+${OBJ}: config.h config.mk arg.h util.h
+
+config.h:
+	cp config.def.h $@
+
+slock: ${OBJ}
+	${CC} -o $@ ${OBJ} ${LDFLAGS}
+
+clean:
+	rm -f slock ${OBJ} slock-${VERSION}.tar.gz
+
+dist: clean
+	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
+	mkdir -p ${DESTDIR}${PREFIX}/bin
+	cp -f slock ${DESTDIR}${PREFIX}/bin
+	chmod 755 ${DESTDIR}${PREFIX}/bin/slock
+	chmod u+s ${DESTDIR}${PREFIX}/bin/slock
+	chmod 644 ${CURDIR}/img.jpg
+	chmod u+s ${CURDIR}/img.jpg
+	mkdir -p ${DESTDIR}${PREFIX}/share/slock
+	cp img.jpg ${DESTDIR}${PREFIX}/share/slock
+	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:
+	rm -f ${DESTDIR}${PREFIX}/bin/slock
+	rm -f ${DESTDIR}${MANPREFIX}/man1/slock.1
+
+.PHONY: all clean dist install uninstall

slock-1.6/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.

slock-1.6/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

slock-1.6/config.def.h

@@ -0,0 +1,23 @@
+/* user and group to drop privileges to */
+static const char *user  = "nobody";
+static const char *group = "nobody";
+
+static const char *colorname[NUMCOLS] = {
+	[BG] =     "black",     /* background */
+	[INIT] =   "#4f525c",   /* after initialization */
+	[INPUT] =  "#005577",   /* during input */
+	[FAILED] = "#CC3333",   /* wrong password */
+};
+
+/* treat a cleared input like a wrong password (color) */
+static const int failonclear = 1;
+
+/*
+* Shapes:
+* 0: square
+* 1: circle
+*/
+static const int shape = 0;
+/* size of square in px */
+static const int shapesize = 50;
+static const int shapegap = 35;

slock-1.6/config.def.h.orig

@@ -0,0 +1,23 @@
+/* user and group to drop privileges to */
+static const char *user  = "nobody";
+static const char *group = "nogroup";
+
+static const char *colorname[NUMCOLS] = {
+	[BG] =     "black",     /* background */
+	[INIT] =   "#4f525c",   /* after initialization */
+	[INPUT] =  "#005577",   /* during input */
+	[FAILED] = "#CC3333",   /* wrong password */
+};
+
+/* treat a cleared input like a wrong password (color) */
+static const int failonclear = 1;
+
+/*
+* Shapes:
+* 0: square
+* 1: circle
+*/
+static const int shape = 0;
+/* size of square in px */
+static const int shapesize = 50;
+static const int shapegap = 35;

slock-1.6/config.h

@@ -0,0 +1,28 @@
+/* user and group to drop privileges to */
+static const char *user  = "nobody";
+static const char *group = "nogroup";
+
+static const char *colorname[NUMCOLS] = {
+	[BG] =     "black",     /* background */
+	[INIT] =   "#4f525c",   /* after initialization */
+	[INPUT] =  "#005577",   /* during input */
+	[FAILED] = "#CC3333",   /* wrong password */
+};
+
+/* 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 = 10;
+
+/*
+* Shapes:
+* 0: square
+* 1: circle
+*/
+static const int shape = 1;
+/* size of square in px */
+static const int shapesize = 50;
+static const int shapegap = 35;
+
+static const char *background_image = "/usr/local/share/slock/img.jpg";

slock-1.6/config.mk

@@ -0,0 +1,29 @@
+# slock version
+VERSION = 1.6
+
+# 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${X11LIB} -lX11 -lXext -lXrandr -lImlib2
+
+# flags
+CPPFLAGS = -DVERSION=\"${VERSION}\" -D_DEFAULT_SOURCE -DHAVE_SHADOW_H
+CFLAGS = -std=c99 -pedantic -Wall -O2 -march=native -mtune=native ${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 =

slock-1.6/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);
+}

slock-1.6/patches/slock-background-image-20220318-1c5a538.diff

@@ -0,0 +1,149 @@
+From 1c5a5383a1cf3351fe9c80a21cfbc98c5ec4355d Mon Sep 17 00:00:00 2001
+From: Yan Doroshenko <yan1994doroshenko@gmail.com>
+Date: Fri, 18 Mar 2022 12:28:13 +0100
+Subject: [PATCH] Provide a way to set a background image
+
+---
+ config.def.h |  5 ++++-
+ config.mk    |  2 +-
+ slock.c      | 50 +++++++++++++++++++++++++++++++++++++++++++++++---
+ 3 files changed, 52 insertions(+), 5 deletions(-)
+
+diff --git a/config.def.h b/config.def.h
+index 9855e21..eb88b3d 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -1,6 +1,6 @@
+ /* user and group to drop privileges to */
+ static const char *user  = "nobody";
+-static const char *group = "nogroup";
++static const char *group = "nobody";
+ 
+ static const char *colorname[NUMCOLS] = {
+ 	[INIT] =   "black",     /* after initialization */
+@@ -10,3 +10,6 @@ static const char *colorname[NUMCOLS] = {
+ 
+ /* treat a cleared input like a wrong password (color) */
+ static const int failonclear = 1;
++
++/* Background image path, should be available to the user above */
++static const char* background_image = "";
+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..345a279 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_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);
+@@ -355,6 +373,32 @@ main(int argc, char **argv) {
+ 	if (setuid(duid) < 0)
+ 		die("slock: setuid: %s\n", strerror(errno));
+ 
++	/* Load picture */
++        Imlib_Image buffer = imlib_load_image(background_image);
++	imlib_context_set_image(buffer);
++        int background_image_width = imlib_image_get_width();
++        int background_image_height = imlib_image_get_height();
++
++        /* Create an image to be rendered */
++	Screen *scr = ScreenOfDisplay(dpy, DefaultScreen(dpy));
++	image = imlib_create_image(scr->width, scr->height);
++        imlib_context_set_image(image);
++
++        /* Fill the image for every X monitor */
++        XRRMonitorInfo	*monitors;
++        int number_of_monitors;
++        monitors = XRRGetMonitors(dpy, RootWindow(dpy, XScreenNumberOfScreen(scr)), True, &number_of_monitors);
++
++        int i;
++        for (i = 0; i < number_of_monitors; i++) {
++            imlib_blend_image_onto_image(buffer, 0, 0, 0, background_image_width, background_image_height, monitors[i].x, monitors[i].y, monitors[i].width, monitors[i].height);
++        }
++
++        /* Clean up */
++        imlib_context_set_image(buffer);
++        imlib_free_image();
++        imlib_context_set_image(image);
++
+ 	/* check for Xrandr support */
+ 	rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
+ 
+-- 
+2.35.1
+

slock-1.6/patches/slock-dpms-20231017-4f04554.diff

@@ -0,0 +1,86 @@
+From 4259049ca8d06a34c828c70298f3a8fdb8c5104c Mon Sep 17 00:00:00 2001
+From: mortezadadgar <mortezadadgar97@gmail.com>
+Date: Sat, 23 Sep 2023 18:45:58 +0330
+Subject: [PATCH] Update to respect prevoius state of dpms
+
+---
+ config.def.h |  3 +++
+ slock.c      | 26 ++++++++++++++++++++++++++
+ 2 files changed, 29 insertions(+)
+
+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 5ae738c..b5ac721 100644
+--- a/slock.c
++++ b/slock.c
+@@ -1,4 +1,5 @@
+ /* See LICENSE file for license details. */
++#include <X11/Xmd.h>
+ #define _XOPEN_SOURCE 500
+ #if HAVE_SHADOW_H
+ #include <shadow.h>
+@@ -15,6 +16,7 @@
+ #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>
+@@ -314,6 +316,8 @@ main(int argc, char **argv) {
+ 	const char *hash;
+ 	Display *dpy;
+ 	int s, nlocks, nscreens;
++	CARD16 standby, suspend, off;
++	BOOL dpms_state;
+ 
+ 	ARGBEGIN {
+ 	case 'v':
+@@ -374,6 +378,22 @@ 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 (!DPMSInfo(dpy, &standby, &dpms_state))
++		die("slock: DPMSInfo failed\n");
++	if (!DPMSEnable(dpy) && !dpms_state)
++		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()) {
+@@ -391,5 +411,11 @@ 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);
++	if (!dpms_state)
++		DPMSDisable(dpy);
++	XSync(dpy, 0);
++
+ 	return 0;
+ }
+-- 
+2.42.0
+

slock-1.6/patches/slock-multi-shapes-1.5.diff

@@ -0,0 +1,186 @@
+diff --git a/config.def.h b/config.def.h
+index 9855e21..e681e8b 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -3,10 +3,21 @@ static const char *user  = "nobody";
+ static const char *group = "nogroup";
+ 
+ static const char *colorname[NUMCOLS] = {
+-	[INIT] =   "black",     /* after initialization */
++	[BG] =     "black",     /* background */
++	[INIT] =   "#4f525c",   /* after initialization */
+ 	[INPUT] =  "#005577",   /* during input */
+ 	[FAILED] = "#CC3333",   /* wrong password */
+ };
+ 
+ /* treat a cleared input like a wrong password (color) */
+ static const int failonclear = 1;
++
++/*
++* Shapes:
++* 0: square
++* 1: circle
++*/
++static const int shape = 0;
++/* size of square in px */
++static const int shapesize = 50;
++static const int shapegap = 35;
+diff --git a/slock.c b/slock.c
+index b2f14e3..501b3be 100644
+--- a/slock.c
++++ b/slock.c
+@@ -25,6 +25,7 @@
+ char *argv0;
+ 
+ enum {
++	BG,
+ 	INIT,
+ 	INPUT,
+ 	FAILED,
+@@ -36,6 +37,8 @@ struct lock {
+ 	Window root, win;
+ 	Pixmap pmap;
+ 	unsigned long colors[NUMCOLS];
++	GC gc;
++	XRRScreenResources *rrsr;
+ };
+ 
+ struct xrandr {
+@@ -124,13 +127,69 @@ gethash(void)
+ 	return hash;
+ }
+ 
++static void
++draw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
++     unsigned int color, unsigned int len)
++{
++	int screen, crtc;
++	XRRCrtcInfo* rrci;
++
++	if (rr->active) {
++		for (screen = 0; screen < nscreens; screen++) {
++			XSetWindowBackground(dpy, locks[screen]->win,locks[screen]->colors[BG]);
++			XClearWindow(dpy, locks[screen]->win);
++			XSetForeground(dpy, locks[screen]->gc, locks[screen]->colors[color]);
++			for (crtc = 0; crtc < locks[screen]->rrsr->ncrtc; ++crtc) {
++				rrci = XRRGetCrtcInfo(dpy,
++				                      locks[screen]->rrsr,
++				                      locks[screen]->rrsr->crtcs[crtc]);
++				/* skip disabled crtc */
++				if (rrci->noutput > 0) {
++					int leftBound = rrci->x + (rrci->width - len * shapesize - (len - 1) * shapegap) / 2;
++					for (int shapei = 0; shapei < len; shapei++) {
++						int x = leftBound + shapei * (shapesize + shapegap);
++						if (shape == 0) {
++							XFillRectangle(dpy,
++								       locks[screen]->win,
++								       locks[screen]->gc,
++								       x,
++								       rrci->y + (rrci->height - shapesize) / 2,
++								       shapesize,
++								       shapesize);
++						} else if (shape == 1) {
++							XFillArc(dpy,
++								 locks[screen]->win,
++								 locks[screen]->gc,
++								 x,
++								 rrci->y + (rrci->height - shapesize) / 2,
++								 shapesize,
++								 shapesize,
++								 0,
++								 360 * 64);
++						}
++					}
++
++				}
++				XRRFreeCrtcInfo(rrci);
++			}
++		}
++	} else {
++		for (screen = 0; screen < nscreens; screen++) {
++			XSetWindowBackground(dpy,
++			                     locks[screen]->win,
++			                     locks[screen]->colors[color]);
++			XClearWindow(dpy, locks[screen]->win);
++		}
++	}
++}
++
+ 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;
++	int num, screen, running, failure, oldc, oldlen;
+ 	unsigned int len, color;
+ 	KeySym ksym;
+ 	XEvent ev;
+@@ -139,6 +198,7 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+ 	running = 1;
+ 	failure = 0;
+ 	oldc = INIT;
++	oldlen = 0;
+ 
+ 	while (running && !XNextEvent(dpy, &ev)) {
+ 		if (ev.type == KeyPress) {
+@@ -188,14 +248,14 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+ 				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);
++			if (running && (oldc != color || oldlen != len)) {
++				int lenToUse = len;
++				if (lenToUse < 1) {
++					lenToUse = 1;
+ 				}
++				draw(dpy, rr, locks, nscreens, color, lenToUse);
+ 				oldc = color;
++				oldlen = len;
+ 			}
+ 		} else if (rr->active && ev.type == rr->evbase + RRScreenChangeNotify) {
+ 			rre = (XRRScreenChangeNotifyEvent*)&ev;
+@@ -228,6 +288,7 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
+ 	XColor color, dummy;
+ 	XSetWindowAttributes wa;
+ 	Cursor invisible;
++	XGCValues gcvalues;
+ 
+ 	if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(struct lock))))
+ 		return NULL;
+@@ -243,7 +304,7 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
+ 
+ 	/* init */
+ 	wa.override_redirect = 1;
+-	wa.background_pixel = lock->colors[INIT];
++	wa.background_pixel = lock->colors[BG];
+ 	lock->win = XCreateWindow(dpy, lock->root, 0, 0,
+ 	                          DisplayWidth(dpy, lock->screen),
+ 	                          DisplayHeight(dpy, lock->screen),
+@@ -255,6 +316,10 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
+ 	invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap,
+ 	                                &color, &color, 0, 0);
+ 	XDefineCursor(dpy, lock->win, invisible);
++	lock->gc = XCreateGC(dpy, lock->win, 0, &gcvalues);
++	XSetForeground(dpy, lock->gc, lock->colors[INIT]);
++	if (rr->active)
++		lock->rrsr = XRRGetScreenResourcesCurrent(dpy, lock->root);
+ 
+ 	/* Try to grab mouse pointer *and* keyboard for 600ms, else fail the lock */
+ 	for (i = 0, ptgrab = kbgrab = -1; i < 6; i++) {
+@@ -388,6 +453,9 @@ main(int argc, char **argv) {
+ 		}
+ 	}
+ 
++	/* draw the initial rectangle */
++	draw(dpy, &rr, locks, nscreens, INIT, 1);
++
+ 	/* everything is now blank. Wait for the correct password */
+ 	readpw(dpy, &rr, locks, nscreens, hash);
+ 

slock-1.6/slock.1

@@ -0,0 +1,45 @@
+.Dd October 6, 2023
+.Dt SLOCK 1
+.Os
+.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
+is executed after the screen has been locked.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl v
+Print version information to stdout and exit.
+.El
+.Sh EXIT STATUS
+.Ex -std
+.Sh EXAMPLES
+$
+.Nm
+/usr/sbin/s2ram
+.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
+Section "ServerFlags"
+	Option "DontVTSwitch" "True"
+	Option "DontZap"      "True"
+EndSection
+.Ed
+.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.

slock-1.6/slock.c

@@ -0,0 +1,541 @@
+/* See LICENSE file for license details. */
+#include <X11/Xmd.h>
+#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 <spawn.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>
+#include <Imlib2.h>
+
+#include "arg.h"
+#include "util.h"
+
+char *argv0;
+
+enum {
+	BG,
+	INIT,
+	INPUT,
+	FAILED,
+	NUMCOLS
+};
+
+struct lock {
+	int screen;
+	Window root, win;
+	Pixmap pmap;
+	Pixmap bgmap;
+	unsigned long colors[NUMCOLS];
+	GC gc;
+	XRRScreenResources *rrsr;
+};
+
+struct xrandr {
+	int active;
+	int evbase;
+	int errbase;
+};
+
+#include "config.h"
+
+Imlib_Image image;
+
+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
+draw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+     unsigned int color, unsigned int len)
+{
+	int screen, crtc;
+	XRRCrtcInfo* rrci;
+
+	if (rr->active) {
+		for (screen = 0; screen < nscreens; screen++) {
+			// XSetWindowBackground(dpy, locks[screen]->win,locks[screen]->colors[BG]);
+            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);
+			XSetForeground(dpy, locks[screen]->gc, locks[screen]->colors[color]);
+			for (crtc = 0; crtc < locks[screen]->rrsr->ncrtc; ++crtc) {
+				rrci = XRRGetCrtcInfo(dpy,
+				                      locks[screen]->rrsr,
+				                      locks[screen]->rrsr->crtcs[crtc]);
+				/* skip disabled crtc */
+				if (rrci->noutput > 0) {
+					int leftBound = rrci->x + (rrci->width - len * shapesize - (len - 1) * shapegap) / 2;
+					for (int shapei = 0; shapei < len; shapei++) {
+						int x = leftBound + shapei * (shapesize + shapegap);
+						if (shape == 0) {
+							XFillRectangle(dpy,
+								       locks[screen]->win,
+								       locks[screen]->gc,
+								       x,
+								       rrci->y + (rrci->height - shapesize) / 2,
+								       shapesize,
+								       shapesize);
+						} else if (shape == 1) {
+							XFillArc(dpy,
+								 locks[screen]->win,
+								 locks[screen]->gc,
+								 x,
+								 rrci->y + (rrci->height - shapesize) / 2,
+								 shapesize,
+								 shapesize,
+								 0,
+								 360 * 64);
+						}
+					}
+
+				}
+				XRRFreeCrtcInfo(rrci);
+			}
+		}
+	} else {
+		for (screen = 0; screen < nscreens; screen++) {
+			XSetWindowBackground(dpy,
+			                     locks[screen]->win,
+			                     locks[screen]->colors[color]);
+			XClearWindow(dpy, locks[screen]->win);
+		}
+	}
+}
+
+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, oldlen;
+	unsigned int len, color;
+	KeySym ksym;
+	XEvent ev;
+
+	len = 0;
+	running = 1;
+	failure = 0;
+	oldc = INIT;
+	oldlen = 0;
+
+	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 || oldlen != len)) {
+				int lenToUse = len;
+				if (lenToUse < 1) {
+					lenToUse = 1;
+				}
+				draw(dpy, rr, locks, nscreens, color, lenToUse);
+				oldc = color;
+				oldlen = len;
+			}
+		} 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;
+	XGCValues gcvalues;
+
+	if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(struct lock))))
+		return NULL;
+
+	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_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);
+		lock->colors[i] = color.pixel;
+	}
+
+	/* init */
+	wa.override_redirect = 1;
+	wa.background_pixel = lock->colors[BG];
+	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);
+        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);
+	XDefineCursor(dpy, lock->win, invisible);
+	lock->gc = XCreateGC(dpy, lock->win, 0, &gcvalues);
+	XSetForeground(dpy, lock->gc, lock->colors[INIT]);
+	if (rr->active)
+		lock->rrsr = XRRGetScreenResourcesCurrent(dpy, lock->root);
+
+	/* 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;
+	CARD16 standby, suspend, off;
+	BOOL dpms_state;
+
+	ARGBEGIN {
+	case 'v':
+		puts("slock-"VERSION);
+		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");
+
+	/* Load picture */
+    int err;
+    Imlib_Image buffer = imlib_load_image_with_errno_return(background_image, &err);
+    if (buffer == NULL) {
+        if (err > 0) {
+            die("imlib error (sys): %s\n", strerror(err));
+        }
+        die("imlib error: %d\n", err);
+    }
+    imlib_context_set_image(buffer);
+    int background_image_width = imlib_image_get_width();
+    int background_image_height = imlib_image_get_height();
+
+	/* 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));
+
+    /* Create an image to be rendered */
+    Screen *scr = ScreenOfDisplay(dpy, DefaultScreen(dpy));
+    image = imlib_create_image(scr->width, scr->height);
+    imlib_context_set_image(image);
+
+    /* Fill the image for every X monitor */
+    XRRMonitorInfo	*monitors;
+    int number_of_monitors;
+    monitors = XRRGetMonitors(dpy, RootWindow(dpy, XScreenNumberOfScreen(scr)), True, &number_of_monitors);
+
+    int i;
+    for (i = 0; i < number_of_monitors; i++) {
+        imlib_blend_image_onto_image(buffer, 0, 0, 0, background_image_width, background_image_height, monitors[i].x, monitors[i].y, monitors[i].width, monitors[i].height);
+    }
+
+    /* Clean up */
+    imlib_context_set_image(buffer);
+    imlib_free_image();
+    imlib_context_set_image(image);
+
+	/* 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;
+
+	/* DPMS magic to disable the monitor */
+	if (!DPMSCapable(dpy))
+		die("slock: DPMSCapable failed\n");
+	if (!DPMSInfo(dpy, &standby, &dpms_state))
+		die("slock: DPMSInfo failed\n");
+	if (!DPMSEnable(dpy) && !dpms_state)
+		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) {
+		pid_t pid;
+		extern char **environ;
+		int err = posix_spawnp(&pid, argv[0], NULL, NULL, argv, environ);
+		if (err) {
+			die("slock: failed to execute post-lock command: %s: %s\n",
+			    argv[0], strerror(err));
+		}
+	}
+
+	/* draw the initial rectangle */
+	draw(dpy, &rr, locks, nscreens, INIT, 1);
+
+	/* 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);
+	if (!dpms_state)
+		DPMSDisable(dpy);
+	XSync(dpy, 0);
+
+	return 0;
+}

slock-1.6/slock.c.orig

@@ -0,0 +1,487 @@
+/* See LICENSE file for license details. */
+#include <X11/Xmd.h>
+#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 <spawn.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>
+
+#include "arg.h"
+#include "util.h"
+
+char *argv0;
+
+enum {
+	BG,
+	INIT,
+	INPUT,
+	FAILED,
+	NUMCOLS
+};
+
+struct lock {
+	int screen;
+	Window root, win;
+	Pixmap pmap;
+	unsigned long colors[NUMCOLS];
+	GC gc;
+	XRRScreenResources *rrsr;
+};
+
+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
+draw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+     unsigned int color, unsigned int len)
+{
+	int screen, crtc;
+	XRRCrtcInfo* rrci;
+
+	if (rr->active) {
+		for (screen = 0; screen < nscreens; screen++) {
+			XSetWindowBackground(dpy, locks[screen]->win,locks[screen]->colors[BG]);
+			XClearWindow(dpy, locks[screen]->win);
+			XSetForeground(dpy, locks[screen]->gc, locks[screen]->colors[color]);
+			for (crtc = 0; crtc < locks[screen]->rrsr->ncrtc; ++crtc) {
+				rrci = XRRGetCrtcInfo(dpy,
+				                      locks[screen]->rrsr,
+				                      locks[screen]->rrsr->crtcs[crtc]);
+				/* skip disabled crtc */
+				if (rrci->noutput > 0) {
+					int leftBound = rrci->x + (rrci->width - len * shapesize - (len - 1) * shapegap) / 2;
+					for (int shapei = 0; shapei < len; shapei++) {
+						int x = leftBound + shapei * (shapesize + shapegap);
+						if (shape == 0) {
+							XFillRectangle(dpy,
+								       locks[screen]->win,
+								       locks[screen]->gc,
+								       x,
+								       rrci->y + (rrci->height - shapesize) / 2,
+								       shapesize,
+								       shapesize);
+						} else if (shape == 1) {
+							XFillArc(dpy,
+								 locks[screen]->win,
+								 locks[screen]->gc,
+								 x,
+								 rrci->y + (rrci->height - shapesize) / 2,
+								 shapesize,
+								 shapesize,
+								 0,
+								 360 * 64);
+						}
+					}
+
+				}
+				XRRFreeCrtcInfo(rrci);
+			}
+		}
+	} else {
+		for (screen = 0; screen < nscreens; screen++) {
+			XSetWindowBackground(dpy,
+			                     locks[screen]->win,
+			                     locks[screen]->colors[color]);
+			XClearWindow(dpy, locks[screen]->win);
+		}
+	}
+}
+
+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, oldlen;
+	unsigned int len, color;
+	KeySym ksym;
+	XEvent ev;
+
+	len = 0;
+	running = 1;
+	failure = 0;
+	oldc = INIT;
+	oldlen = 0;
+
+	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 || oldlen != len)) {
+				int lenToUse = len;
+				if (lenToUse < 1) {
+					lenToUse = 1;
+				}
+				draw(dpy, rr, locks, nscreens, color, lenToUse);
+				oldc = color;
+				oldlen = len;
+			}
+		} 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;
+	XGCValues gcvalues;
+
+	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[BG];
+	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);
+	lock->gc = XCreateGC(dpy, lock->win, 0, &gcvalues);
+	XSetForeground(dpy, lock->gc, lock->colors[INIT]);
+	if (rr->active)
+		lock->rrsr = XRRGetScreenResourcesCurrent(dpy, lock->root);
+
+	/* 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;
+	CARD16 standby, suspend, off;
+	BOOL dpms_state;
+
+	ARGBEGIN {
+	case 'v':
+		puts("slock-"VERSION);
+		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;
+
+	/* DPMS magic to disable the monitor */
+	if (!DPMSCapable(dpy))
+		die("slock: DPMSCapable failed\n");
+	if (!DPMSInfo(dpy, &standby, &dpms_state))
+		die("slock: DPMSInfo failed\n");
+	if (!DPMSEnable(dpy) && !dpms_state)
+		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) {
+		pid_t pid;
+		extern char **environ;
+		int err = posix_spawnp(&pid, argv[0], NULL, NULL, argv, environ);
+		if (err) {
+			die("slock: failed to execute post-lock command: %s: %s\n",
+			    argv[0], strerror(err));
+		}
+	}
+
+	/* draw the initial rectangle */
+	draw(dpy, &rr, locks, nscreens, INIT, 1);
+
+	/* 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);
+	if (!dpms_state)
+		DPMSDisable(dpy);
+	XSync(dpy, 0);
+
+	return 0;
+}

slock-1.6/util.h

@@ -0,0 +1,2 @@
+#undef explicit_bzero
+void explicit_bzero(void *, size_t);