+ XFreePixmap(dpy, lock->pmap);
+ XDestroyWindow(dpy, lock->win);
+
+ free(lock);
+}
+
+static Lock *
+lockscreen(Display *dpy, int screen) {
+ char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
+ unsigned int len;
+ Lock *lock;
+ XColor black, dummy;
+ XSetWindowAttributes wa;
+ Cursor invisible;
+
+ if(dpy == NULL || screen < 0)
+ return NULL;
+
+ lock = malloc(sizeof(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->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);
+ XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), "black", &black, &dummy);
+ lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
+ invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &black, &black, 0, 0);
+ XDefineCursor(dpy, lock->win, invisible);
+ XMapRaised(dpy, lock->win);
+ for(len = 1000; len; len--) {
+ if(XGrabPointer(dpy, lock->root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
+ GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
+ break;
+ usleep(1000);
+ }
+ if(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;
+ }
+ else
+ XSelectInput(dpy, lock->root, SubstructureNotifyMask);
+
+ return lock;
+}
+
+static void
+usage(void) {
+ fprintf(stderr, "usage: slock [-v]\n");
+ exit(EXIT_FAILURE);
+}
+
+int
+main(int argc, char **argv) {
+#ifndef HAVE_BSD_AUTH
+ const char *pws;
+#endif
+ Display *dpy;
+ int screen;
+
+ if((argc == 2) && !strcmp("-v", argv[1]))
+ die("slock-%s, © 2006-2012 Anselm R Garbe\n", VERSION);
+ else if(argc != 1)
+ usage();
+
+ if(!getpwuid(getuid()))
+ die("slock: no passwd entry for you");
+
+#ifndef HAVE_BSD_AUTH
+ pws = getpw();
+#endif
+
+ if(!(dpy = XOpenDisplay(0)))
+ die("slock: cannot open display");
+ /* Get the number of screens in display "dpy" and blank them all. */
+ nscreens = ScreenCount(dpy);
+ locks = malloc(sizeof(Lock *) * nscreens);
+ if(locks == NULL)
+ die("slock: 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
+ readpw(dpy);
+#else
+ readpw(dpy, pws);
+#endif
+
+ /* Password ok, unlock everything and quit. */
+ for(screen = 0; screen < nscreens; screen++)
+ unlockscreen(dpy, locks[screen]);
+
+ free(locks);