304 lines
6.7 KiB
C
304 lines
6.7 KiB
C
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/* See LICENSE file for license details. */
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#define _XOPEN_SOURCE 500
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#include <ctype.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <X11/keysym.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#define PWD_MAX_LEN 100
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#define COLOR1 "#00FF00"
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#define COLOR2 "#FF0000"
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#define VERSION "42.1337"
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typedef struct {
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int screen;
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Window root, win;
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Pixmap pmap;
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unsigned long colors[2];
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} Lock;
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static Lock **locks;
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static int nscreens;
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static Bool running = True;
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static void
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die(const char *errstr, ...) {
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va_list ap;
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va_start(ap, errstr);
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vfprintf(stderr, errstr, ap);
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va_end(ap);
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exit(EXIT_FAILURE);
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}
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#ifdef __linux__
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#include <fcntl.h>
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static void
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dontkillme(void) {
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int fd;
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fd = open("/proc/self/oom_score_adj", O_WRONLY);
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if (fd < 0 && errno == ENOENT)
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return;
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if (fd < 0 || write(fd, "-1000\n", 6) != 6 || close(fd) != 0)
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die("cannot disable the out-of-memory killer for this process\n");
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}
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#endif
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char *
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getpw(void) {
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FILE *pwd_file;
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char *pwd;
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if(!(pwd = malloc(PWD_MAX_LEN * sizeof(*pwd)))) {
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die("could not malloc memory");
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}
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#define PWD_FILE "/home/frank/Private/.lock_pwd"
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pwd_file = fopen(PWD_FILE, "r");
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if(!pwd_file) {
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die("Could not open "PWD_FILE" for reading\n");
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}
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fgets(pwd, PWD_MAX_LEN, pwd_file);
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if(pwd[strlen(pwd)-1] == '\n')
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pwd[strlen(pwd)-1] = '\0';
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if(strlen(pwd) <= 1) {
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die("Password seems to short: %s\n", pwd);
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}
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fclose(pwd_file);
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return pwd;
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}
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static void
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readpw(Display *dpy, char *pws)
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{
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char buf[32], passwd[256];
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int num, screen;
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unsigned int len, llen;
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KeySym ksym;
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XEvent ev;
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len = llen = 0;
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running = True;
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while(running && !XNextEvent(dpy, &ev)) {
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if(ev.type == KeyPress) {
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buf[0] = 0;
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num = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, 0);
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if(IsKeypadKey(ksym)) {
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if(ksym == XK_KP_Enter)
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ksym = XK_Return;
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else if(ksym >= XK_KP_0 && ksym <= XK_KP_9)
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ksym = (ksym - XK_KP_0) + XK_0;
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}
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if(IsFunctionKey(ksym) || IsKeypadKey(ksym) ||
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IsMiscFunctionKey(ksym) || IsPFKey(ksym) ||
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IsPrivateKeypadKey(ksym))
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continue;
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switch(ksym) {
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case XK_Return:
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passwd[len] = '\0';
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running = !!strcmp(passwd, pws);
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if(running)
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XBell(dpy, 100);
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len = 0;
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break;
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case XK_Escape:
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len = 0;
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break;
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case XK_BackSpace:
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if(len)
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--len;
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break;
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default:
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if(num && !iscntrl((int) buf[0]) &&
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(len + num < sizeof passwd)) {
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memcpy(passwd + len, buf, num);
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len += num;
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}
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break;
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}
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if(llen == 0 && len != 0) {
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for(screen = 0; screen < nscreens; screen++) {
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XSetWindowBackground(dpy,
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locks[screen]->win,
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locks[screen]->colors[1]);
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XClearWindow(dpy, locks[screen]->win);
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}
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} else if(llen != 0 && len == 0) {
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for(screen = 0; screen < nscreens; screen++) {
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XSetWindowBackground(dpy,
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locks[screen]->win,
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locks[screen]->colors[0]);
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XClearWindow(dpy, locks[screen]->win);
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}
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}
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llen = len;
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}
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else for(screen = 0; screen < nscreens; screen++)
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XRaiseWindow(dpy, locks[screen]->win);
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}
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}
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static void
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unlockscreen(Display *dpy, Lock *lock)
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{
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if(dpy == NULL || lock == NULL)
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return;
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XUngrabPointer(dpy, CurrentTime);
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XFreeColors(dpy, DefaultColormap(dpy, lock->screen), lock->colors, 2, 0);
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XFreePixmap(dpy, lock->pmap);
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XDestroyWindow(dpy, lock->win);
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free(lock);
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}
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static Lock *
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lockscreen(Display *dpy, int screen)
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{
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char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
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unsigned int len;
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Lock *lock;
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XColor color, dummy;
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XSetWindowAttributes wa;
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Cursor invisible;
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if(dpy == NULL || screen < 0)
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return NULL;
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lock = malloc(sizeof(Lock));
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if(lock == NULL)
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return NULL;
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lock->screen = screen;
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lock->root = RootWindow(dpy, lock->screen);
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/* init */
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wa.override_redirect = 1;
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wa.background_pixel = BlackPixel(dpy, lock->screen);
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lock->win = XCreateWindow(dpy, lock->root, 0, 0,
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DisplayWidth(dpy, lock->screen),
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DisplayHeight(dpy, lock->screen), 0,
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DefaultDepth(dpy, lock->screen),
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CopyFromParent,
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DefaultVisual(dpy, lock->screen),
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CWOverrideRedirect | CWBackPixel, &wa);
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XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), COLOR2,
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&color, &dummy);
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lock->colors[1] = color.pixel;
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XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), COLOR1,
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&color, &dummy);
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lock->colors[0] = color.pixel;
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lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
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invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &color,
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&color, 0, 0);
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XDefineCursor(dpy, lock->win, invisible);
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XMapRaised(dpy, lock->win);
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for(len = 1000; len; len--) {
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if(XGrabPointer(dpy, lock->root, False,
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ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
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GrabModeAsync, GrabModeAsync, None, invisible,
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CurrentTime) == GrabSuccess)
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break;
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usleep(1000);
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}
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if(running && (len > 0)) {
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for(len = 1000; len; len--) {
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if(XGrabKeyboard(dpy, lock->root, True, GrabModeAsync,
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GrabModeAsync, CurrentTime)
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== GrabSuccess)
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break;
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usleep(1000);
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}
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}
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running &= (len > 0);
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if(!running) {
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unlockscreen(dpy, lock);
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lock = NULL;
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}
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else
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XSelectInput(dpy, lock->root, SubstructureNotifyMask);
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return lock;
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}
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static void
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usage(void) {
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fprintf(stderr, "usage: slock [-v]\n");
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exit(EXIT_FAILURE);
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}
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int
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main(int argc, char **argv) {
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char *pws;
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Display *dpy;
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int screen;
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if((argc == 2) && !strcmp("-v", argv[1]))
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die("slock-%s, © 2006-2012 Anselm R Garbe\n", VERSION);
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else if(argc != 1)
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usage();
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#ifdef __linux__
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//dontkillme();
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#endif
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pws = getpw();
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if(!(dpy = XOpenDisplay(0)))
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die("slock: cannot open display\n");
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/* Get the number of screens in display "dpy" and blank them all. */
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nscreens = ScreenCount(dpy);
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locks = malloc(sizeof(Lock *) * nscreens);
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if(locks == NULL)
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die("slock: malloc: %s\n", strerror(errno));
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int nlocks = 0;
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for(screen = 0; screen < nscreens; screen++) {
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if((locks[screen] = lockscreen(dpy, screen)) != NULL)
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nlocks++;
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}
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XSync(dpy, False);
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/* Did we actually manage to lock something? */
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if(nlocks == 0) { // nothing to protect
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free(locks);
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XCloseDisplay(dpy);
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return 1;
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}
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/* Everything is now blank. Now wait for the correct password. */
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readpw(dpy, pws);
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/* Password ok, unlock everything and quit. */
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for(screen = 0; screen < nscreens; screen++)
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unlockscreen(dpy, locks[screen]);
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free(locks);
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free(pws);
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XCloseDisplay(dpy);
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return 0;
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}
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