Resolved conflict, indulging new file layout

1 files changed, 576 insertions, 0 deletions

diff --git a/core/slock/slock.c b/core/slock/slock.c
new file mode 100644
index 0000000..297e076
--- /dev/null
+++ b/core/slock/slock.c
@@ -0,0 +1,576 @@
+/* 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 <spawn.h>
+#include <sys/types.h>
+#include <time.h>
+#include <poll.h>
+#include <X11/extensions/Xrandr.h>
+#include <X11/keysym.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xft/Xft.h>
+#include <Imlib2.h>
+#include "../accent.h"
+
+#include "arg.h"
+#include "util.h"
+
+char *argv0;
+
+enum {
+	INIT,
+	INPUT,
+	FAILED,
+	NUMCOLS
+};
+
+struct lock {
+        int screen;
+        Window root, win;
+        Pixmap pmap;
+        Pixmap bgmap;
+        unsigned long colors[NUMCOLS];
+        XftDraw *draw;
+};
+
+struct xrandr {
+        int active;
+        int evbase;
+        int errbase;
+};
+
+#include "config.h"
+
+static ColorShm *accentshm;
+static char accentcol[8] = "#005577";
+static XftFont *font;
+
+static const char *icon[] = {
+"                   ██████████████                                   ██████████████                   ",
+"                   ██████████████                                   █████████████                   ",
+"                   ██████▓▓▓█████                                   █████▓▓▓██████                   ",
+"                   █████▓▓▓▓█████                                   █████▓▓▓▓█████                   ",
+"                   █████▓▓▓▓█████                                   █████▓▓▓▓█████                   ",
+"                   █████▓▓▓▓▓████                                   ████▓▓▓▓▓█████                   ",
+"                   █████▓▓▓▓▓████████   █████████████████████   ████████▓▓▓▓▓█████                   ",
+"                   ██████▓▓▓▓▓▓▓█████   █████████████████████   █████▓▓▓▓▓▓▓██████                   ",
+"▓▓▓▓▓▓▓▓           ██████▓▓▓▓▓▓▓█████   █████████████████████   █████▓▓▓▓▓▓▓██████           ▓▓▓▓▓▓▓▓",
+"▓▓▓▓▓▓▓▓▓              █████▓▓▓▓▓████   ████▓▒▒▒▒▓▓▓▒▒▒▒▓████   ████▓▓▓▓▓█████              ▓▓▓▓▓▓▓▓▓",
+"▓▓▓▓▓▓▓▓▓              █████▓▓▓▓▓████   ████▓▒▒▒▒▓▓▓▒▒▒▒▓████   ████▓▓▓▓▓█████              ▓▓▓▓▓▓▓▓▓",
+"▓▓▓▓▒░░░▒▓▓▓▓          █████▓▓▓▓▓▓▓▓█████▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▒▓▓▓█████▓▓▓▓▓▓▓▓█████          ▓▓▓▓▒░░░▒▓▓▓▓",
+"▓▓▓▓▒░░░▒▓▓▓▓          █████▓▓▓▓▓▓▓▓█████▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▒▓▓▓█████▓▓▓▓▓▓▓▓█████          ▓▓▓▓▒░░░░▓▓▓▓",
+"▓▓▓▓▒▒▒▒░░░░▒▓▓▓▓  █████████▓▓▓▓▓▒▒▒▓███▓▓▓▓▓▓▓▓█████▓▓▓▓▓▓▓▓███▓▒▒▒▒▓▓▓▓█████████  ▓▓▓▓▒░░░░▒▒▒▒▓▓▓▓",
+"   ▒▒▒▒▒░░░░▒▓▓▓▓  ██████████▓▓▓▒▒▒▒▓███▓▓▓▓▓███████████▓▓▓▓▓███▓▒▒▒▒▓▓▓▓█████████  ▓▓▓▓▒░░░░▒▒▒▒▒   ",
+"   ▓▓▓▓▓░░░░▒▒▒▒▓▓▓▓████████████▓▒▒▒▓███████▓▓▓▓█████▓▓▓▓███████▓▒▒▒▒▓████████████▓▓▓▒▒▒▒░░░░▒▓▓▓▓   ",
+"   ████▓▒░░░░░░▒▒▓▓▓████████████▓▒▒▒▓████████▓▓▓▓▓▓▓▓▓▓▓████████▓▒▒▒▓████████████▓▓▓▓▒░░░░░░░▓████   ",
+"   ████▓▒▒▒▒░░░░▒▓▓▓▓███████████▓▒▒▒▓▓▓▓████▓▒▒▒▒▒▒▒▒▒▒▒▓████▓▓▓▓▒▒▒▓████████████▓▓▓▒▒░░░▒▒▒▒▓████   ",
+"       ▓▓▓▓▓▒░░░▒▒▒▒▓▓▓▓▓███████▓▒▒▒▒▒▒▒▓███▒░░░░░░░░░░░▒▓██▓▒▒▒▒▒▒▒▒▓██████▓▓▓▓▓▒▒▒▒░░░▒▓▓▓▓▓       ",
+"       ▓▓▓▓▓▒░░░▒▒▒▒▒▓▓▓▓███████▓▒▒▒▒▒▒▒▓███▒░░░░░░░░░░▒▓██▓▒▒▒▒▒▒▒▓▓██████▓▓▓▓▓▒▒▒▒░░░▒▓▓▓▓▓       ",
+"       ▓▓▓▓▓▒░░░▒▒▒▒▒▒▒▒▓▓▓▓████▓▓▓▒▒░░░▒███▒░░░░░░░░░░░▒▓██▓░░░▒▒▓▓▓████▓▓▓▓▒▒▒▒▒▒▒▒░░░▒▓▓▓▓▓       ",
+"       ▓▓▓▓▓▒░░░▒▒▒▒▒▒▒▒▓▓▓▓████▓▓▓▒▒░░░▒███▒░░░░░░░░░░░▒▓██▓░░░▒▒▓▓▓████▓▓▓▓▒▒▒▒▒▒▒▒░░░▒▓▓▓▓▓       ",
+"           ▓▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▓██████▓▒░░░░░░░▒▒▒▒▒▒▒▒▒▒▒▒▒▒░░░░░░▒▓██████▓▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓           ",
+"           ▓▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▓██████▓▒░░░░░░░▒▒▒▒▒▒▒▒▒▒▒▒▒░░░░░░░▒▓██████▓▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓           ",
+"           ████▓▓▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▓▓████           ",
+"           ████▓▓▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓███▓▓▓▓▓▓▓▓▓▓▓▓▓███▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▓▓████           ",
+"           █████▓▓▓▓▓███▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓███▓▓▓▓█████           ",
+"           █████████████▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓█████████████           ",
+"           █████▓▓▓▓████▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓████▓▓▓▓█████           ",
+"           ████▓▓▒▒▒▓███████████▓▓▓▓▓▓▓▓▒░░░░░░░░░░░░░░░░░░░▒▒▓▓▓▓▓▓▓███████████▓▒▒▒▒▓████           ",
+"        ████▓▓▓▓▒▒▒▒▓▓▓▓████████▓▓▓▓▓▓▓▓▒▒▒▒▒░░░░░░░░░░░░▒▒▒▒▓▓▓▓▓▓▓▓█████████▓▓▓▒▒▒▒▓▓▓▓████        ",
+"       █████▓▒▒▒▒▒▒▒▒▓▓▓▓▓▓▓████████████▓▓▓▓▒░░░░░░░░░░░▒▓▓▓▓████████████▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒▓█████       ",
+"       █████▓▒▒▒▒▒▒▒▒▓▓▓▓▓▓▓████████████▓▓▓▓▒░░░░░░░░░░░▒▓▓▓▓████████████▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒▓█████       ",
+"       █████▓▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓▓███████████████████████████████████████████▓▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▓█████       ",
+"       █████▓▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓▓██████████████████████████████████████████▓▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▓█████       ",
+"       █████▓▓▓▓▓▓▓▓▓▓▓▓█████████████████████▓▓▓██████▓▓█████████████████████▓▓▓▓▓▓▓▓▓▓▓▓█████       ",
+"       ██████▓▓▓▓▓▓▓▓████████▓▓▓█████████████▓▓▓█████▓▓▓█████████████▓▓▓████████▓▓▓▓▓▓▓▓▓█████       ",
+"       █████████▓▓▓▓▓████████▓▓▓▓████████████▓▓▓█████▓▓▓▓████████████▓▓▓████████▓▓▓▓▓█████████       ",
+"           █████▓▓▓▓▓████████▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓█████▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓████████▓▓▓▓▓█████           ",
+"           ██████▓▓▓▓▓▓▓████████▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓█████▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓████████▓▓▓▓▓▓▓▓█████           ",
+"           ██████▓▓▓▓▓▓▓▓████████▓▓▓█████████▓▓▓▓▓▓▓▓▓▓▓█████████▓▓▓████████▓▓▓▓▓▓▓▓██████           ",
+"           ██████▓▓▓▓▓▓▓▓████████████████████▓▓▓▓▓▓▓▓▓▓▓████████████████████▓▓▓▓▓▓▓▓██████           ",
+"           ██████████████████████████████████▓▓▓▓▓▓▓▓▓▓▓██████████████████████████████████           ",
+"           ██████████████████████████████████▓▓▓▓▓▓▓▓▓▓▓██████████████████████████████████           ",
+"                       ██████▓▓▓▓▓▓██████▓▓▓████▓▓▓▓▓████▓▓▓██████▓▓▓▓▓▓▓█████                       ",
+"                       ██████▓▓▓▓▓▓▓█████▓▓▓████▓▓▓▓▓████▓▓▓██████▓▓▓▓▓▓▓█████                       ",
+"                       █████▓▓▓▓▓▓▓▓█████████████████████████████▓▓▓▓▓▓▓▓█████                       ",
+"                       █████▓▓▓▓▓▓▓▓█████████▓▓▓█████▓▓▓█████████▓▓▓▓▓▓▓▓█████                       ",
+"                       ██████▓▓▓▓▓▓▓█████████▓▓▓▓███▓▓▓▓██████████▓▓▓▓▓▓██████                       ",
+"                       ██████████████████▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓██████████████████                       ",
+"                       █████████████████████▓▓▓▓▓▓▓▓▓▓▓▓▓█████████████████████                       ",
+"                            ████████████████▓▓▓▓▓▓▓▓▓▓▓██████████████████                           ",
+"                            ██████████████████████████████████████████████                           ",
+"                                            █████████████                                            ",
+"                                            █████████████                                            ",
+NULL};
+
+static void
+updateaccent(void)
+{
+        if (!readaccent(&accentshm, accentcol))
+                memcpy(accentcol, "#005577", 8);
+}
+
+static void
+drawlogo(Display *dpy, struct lock *lock, const char *col)
+{
+        XftColor xftc;
+        XGlyphInfo ext;
+        int i, x, y, w, h, lines = 0, maxw = 0, lineh;
+        size_t len;
+
+        w = DisplayWidth(dpy, lock->screen);
+        h = DisplayHeight(dpy, lock->screen);
+        lineh = font->ascent + font->descent;
+
+        for (i = 0; icon[i]; i++) {
+                len = strlen(icon[i]);
+                while (len && icon[i][len - 1] == ' ')
+                        len--;
+                XftTextExtentsUtf8(dpy, font, (FcChar8 *)icon[i], len, &ext);
+                if (ext.xOff > maxw)
+                        maxw = ext.xOff;
+                lines++;
+        }
+        x = (w - maxw) / 2;
+        y = (h - lines * lineh) / 2 + font->ascent;
+
+        if (!XftColorAllocName(dpy, DefaultVisual(dpy, lock->screen),
+                               DefaultColormap(dpy, lock->screen), col, &xftc))
+                return;
+
+        XClearWindow(dpy, lock->win);
+        for (i = 0; icon[i]; i++) {
+                len = strlen(icon[i]);
+                while (len && icon[i][len - 1] == ' ')
+                        len--;
+                XftDrawStringUtf8(lock->draw, &xftc, font, x, y,
+                                  (FcChar8 *)icon[i], len);
+                y += lineh;
+        }
+
+        XftColorFree(dpy, DefaultVisual(dpy, lock->screen),
+                     DefaultColormap(dpy, lock->screen), &xftc);
+}
+
+static void
+blurbackground(Display *dpy, struct lock *lock)
+{
+        int w = DisplayWidth(dpy, lock->screen);
+        int h = DisplayHeight(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->root);
+
+        Imlib_Image img = imlib_create_image_from_drawable(0, 0, 0, w, h, 1);
+        if (!img)
+                return;
+        imlib_context_set_image(img);
+        imlib_image_blur(75);
+
+        lock->bgmap = XCreatePixmap(dpy, lock->root, w, h,
+                                    DefaultDepth(dpy, lock->screen));
+        imlib_context_set_drawable(lock->bgmap);
+        imlib_render_image_on_drawable(0, 0);
+        imlib_free_image();
+
+        XSetWindowBackgroundPixmap(dpy, lock->win, lock->bgmap);
+}
+
+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;
+        unsigned int len;
+        KeySym ksym;
+        XEvent ev;
+        struct pollfd pfd;
+        time_t last;
+        const char *col, *oldcol = NULL;
+        char lastaccent[8];
+
+        len = 0;
+        running = 1;
+        failure = 0;
+
+        updateaccent();
+        memcpy(lastaccent, accentcol, 8);
+        col = accentcol;
+        last = time(NULL);
+        for (screen = 0; screen < nscreens; screen++)
+                drawlogo(dpy, locks[screen], col);
+
+        pfd.fd = ConnectionNumber(dpy);
+        pfd.events = POLLIN;
+
+        while (running) {
+               /* poll at ~60Hz so accent gradients appear smooth */
+               if (poll(&pfd, 1, 5) > 0) {
+                        while (XPending(dpy)) {
+                                XNextEvent(dpy, &ev);
+                                if (ev.type == KeyPress) {
+                                        last = time(NULL);
+                                        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;
+                                                } else if (buf[0] == '\025') { /* ctrl-u clears input */
+                                                        explicit_bzero(&passwd, sizeof(passwd));
+                                                        len = 0;
+                                                }
+                                                break;
+                                        }
+                                } 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);
+                                                        drawlogo(dpy, locks[screen], col);
+                                                        break;
+                                                }
+                                        }
+                                } else {
+                                        for (screen = 0; screen < nscreens; screen++)
+                                                XRaiseWindow(dpy, locks[screen]->win);
+                                }
+                        }
+                }
+
+                updateaccent();
+                int idle = time(NULL) - last >= 3;
+
+                if (!idle && len)
+                        col = colorname[INPUT];
+                else if (!idle && (failure || failonclear))
+                        col = colorname[FAILED];
+                else
+                        col = accentcol;
+
+                if ((col == accentcol && memcmp(accentcol, lastaccent, 8) != 0) || col != oldcol) {
+                        memcpy(lastaccent, accentcol, 8);
+                        for (screen = 0; screen < nscreens; screen++)
+                                drawlogo(dpy, locks[screen], col);
+                        oldcol = col;
+                }
+        }
+}
+
+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);
+
+        blurbackground(dpy, lock);
+
+        if (!font)
+                font = XftFontOpenName(dpy, lock->screen, "monospace:size=10");
+        lock->draw = XftDrawCreate(dpy, lock->win,
+                                   DefaultVisual(dpy, lock->screen),
+                                   DefaultColormap(dpy, lock->screen));
+
+	/* 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':
+		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;
+
+	/* 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));
+		}
+	}
+
+	/* everything is now blank. Wait for the correct password */
+	readpw(dpy, &rr, locks, nscreens, hash);
+
+	return 0;
+}