# HG changeset patch
# User Anselm R Garbe <garbeam@gmail.com>
# Date 1259240006 0
# Node ID 4d3769ac5d02d1967528b7687123bbf92979c503
# Parent  297116d7e65ae1f442014ba99eb6c957b4b836cf
applied Fernando Silveira's multiscreen patch for old style multihead setups

diff -r 297116d7e65a -r 4d3769ac5d02 slock.c
--- a/slock.c	Fri Dec 12 19:34:43 2008 +0000
+++ b/slock.c	Thu Nov 26 12:53:26 2009 +0000
@@ -5,6 +5,7 @@
 #endif
 
 #include <ctype.h>
+#include <errno.h>
 #include <pwd.h>
 #include <stdarg.h>
 #include <stdlib.h>
@@ -15,31 +16,42 @@
 #include <X11/keysym.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
-#include <X11/extensions/dpms.h>
 
 #if HAVE_BSD_AUTH
 #include <login_cap.h>
 #include <bsd_auth.h>
 #endif
 
+struct st_lock {
+	int screen;
+	Window root, w;
+	Pixmap pmap;
+};
+
+extern const char *__progname;
+
 static void
 die(const char *errstr, ...) {
 	va_list ap;
 
+	fprintf(stderr, "%s: ", __progname);
 	va_start(ap, errstr);
 	vfprintf(stderr, errstr, ap);
 	va_end(ap);
+	fprintf(stderr, "\n");
+	fflush(stderr);
+
 	exit(EXIT_FAILURE);
 }
 
 #ifndef HAVE_BSD_AUTH
 static const char *
-get_password() { /* only run as root */
+get_password(void) { /* only run as root */
 	const char *rval;
 	struct passwd *pw;
 
 	if(geteuid() != 0)
-		die("slock: cannot retrieve password entry (make sure to suid slock)\n");
+		die("cannot retrieve password entry (make sure to suid slock)");
 	pw = getpwuid(getuid());
 	endpwent();
 	rval =  pw->pw_passwd;
@@ -55,81 +67,34 @@
 
 	/* drop privileges */
 	if(setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0)
-		die("slock: cannot drop privileges\n");
+		die("cannot drop privileges");
 	return rval;
 }
 #endif
 
-int
-main(int argc, char **argv) {
-	char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
+static void
+#ifdef HAVE_BSD_AUTH
+read_password(Display *dpy)
+#else
+read_password(Display *dpy, const char *pws)
+#endif
+{
 	char buf[32], passwd[256];
-	int num, screen;
+	int num;
 
-#ifndef HAVE_BSD_AUTH
-	const char *pws;
-#endif
 	unsigned int len;
 	Bool running = True;
-	Cursor invisible;
-	Display *dpy;
 	KeySym ksym;
-	Pixmap pmap;
-	Window root, w;
-	XColor black, dummy;
 	XEvent ev;
-	XSetWindowAttributes wa;
-	CARD16 standby, suspend, off;
 
-	if((argc == 2) && !strcmp("-v", argv[1]))
-		die("slock-"VERSION", © 2006-2008 Anselm R Garbe\n");
-	else if(argc != 1)
-		die("usage: slock [-v]\n");
+	len = 0;
+	running = True;
 
-#ifndef HAVE_BSD_AUTH
-	pws = get_password();
-#endif
+	/* As "slock" stands for "Simple X display locker", the DPMS settings
+	 * had been removed and you can set it with "xset" or some other
+	 * utility. This way the user can easily set a customized DPMS
+	 * timeout. */
 
-	if(!(dpy = XOpenDisplay(0)))
-		die("slock: cannot open display\n");
-	screen = DefaultScreen(dpy);
-	root = RootWindow(dpy, screen);
-
-	/* init */
-	wa.override_redirect = 1;
-	wa.background_pixel = BlackPixel(dpy, screen);
-	w = XCreateWindow(dpy, root, 0, 0, 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);
-	XMapRaised(dpy, w);
-	for(len = 1000; len; len--) {
-		if(XGrabPointer(dpy, root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
-			GrabModeAsync, GrabModeAsync, 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);
-
-	if(DPMSCapable(dpy)) { /* save and customize DPMS settings */
-		DPMSGetTimeouts(dpy, &standby, &suspend, &off);
-		DPMSSetTimeouts(dpy, 10, 30, 90);
-	}
-
-	/* main event loop */
 	while(running && !XNextEvent(dpy, &ev)) {
 		if(ev.type == KeyPress) {
 			buf[0] = 0;
@@ -172,12 +137,129 @@
 			}
 		}
 	}
-	if(DPMSCapable(dpy)) { /* restore DPMS settings */
-		DPMSSetTimeouts(dpy, standby, suspend, off);
+}
+
+static void
+unlockscreen(Display *dpy, struct st_lock *lock) {
+	if (dpy == NULL || lock == NULL)
+		return;
+
+	XUngrabPointer(dpy, CurrentTime);
+	XFreePixmap(dpy, lock->pmap);
+	XDestroyWindow(dpy, lock->w);
+
+	free(lock);
+}
+
+static struct st_lock *
+lockscreen(Display *dpy, int screen) {
+	char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
+	unsigned int len;
+	struct st_lock *lock;
+	Bool running = True;
+	XColor black, dummy;
+	XSetWindowAttributes wa;
+	Cursor invisible;
+
+	if (dpy == NULL || screen < 0)
+		return NULL;
+
+	lock = malloc(sizeof(struct st_lock));
+	if (lock == NULL)
+		return NULL;
+
+	lock->screen = screen;
+
+	lock->root = RootWindow(dpy, lock->screen);
+
+	/* init */
+	wa.override_redirect = 1;
+	wa.background_pixel = BlackPixel(dpy, lock->screen);
+	lock->w = 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);
+	XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), "black", &black, &dummy);
+	lock->pmap = XCreateBitmapFromData(dpy, lock->w, curs, 8, 8);
+	invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &black, &black, 0, 0);
+	XDefineCursor(dpy, lock->w, invisible);
+	XMapRaised(dpy, lock->w);
+	for(len = 1000; len; len--) {
+		if(XGrabPointer(dpy, lock->root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
+			GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
+			break;
+		usleep(1000);
 	}
-	XUngrabPointer(dpy, CurrentTime);
-	XFreePixmap(dpy, pmap);
-	XDestroyWindow(dpy, w);
+	if((running = running && (len > 0))) {
+		for(len = 1000; len; len--) {
+			if(XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
+				== GrabSuccess)
+				break;
+			usleep(1000);
+		}
+		running = (len > 0);
+	}
+
+	if (!running) {
+		unlockscreen(dpy, lock);
+		lock = NULL;
+	}
+
+	return lock;
+}
+
+static void
+usage(void) {
+	fprintf(stderr, "usage: %s -v", __progname);
+	exit(EXIT_FAILURE);
+}
+
+int
+main(int argc, char **argv) {
+#ifndef HAVE_BSD_AUTH
+	const char *pws;
+#endif
+	Display *dpy;
+	int nscreens, screen;
+
+	struct st_lock **locks;
+
+	if((argc == 2) && !strcmp("-v", argv[1]))
+		die("slock-%s, © 2006-2008 Anselm R Garbe", VERSION);
+	else if(argc != 1)
+		usage();
+
+#ifndef HAVE_BSD_AUTH
+	pws = get_password();
+#endif
+
+	if(!(dpy = XOpenDisplay(0)))
+		die("cannot open display");
+
+	/* Get the number of screens in display "dpy" and blank them all. */
+	nscreens = ScreenCount(dpy);
+	locks = malloc(sizeof(struct st_lock *) * nscreens);
+	if (locks == NULL)
+		die("malloc: %s", strerror(errno));
+
+	for (screen = 0; screen < nscreens; screen++)
+		locks[screen] = lockscreen(dpy, screen);
+
+	XSync(dpy, False);
+
+	/* Everything is now blank. Now wait for the correct password. */
+#ifdef HAVE_BSD_AUTH
+	read_password(dpy);
+#else
+	read_password(dpy, pws);
+#endif
+
+	/* Password ok, unlock everything and quit. */
+	for (screen = 0; screen < nscreens; screen++)
+		unlockscreen(dpy, locks[screen]);
+
+	free(locks);
+
 	XCloseDisplay(dpy);
+
 	return 0;
 }