update copyright year in -v output

[slock.git] / slock.c

diff --git a/slock.c b/slock.c
index ddf1074..cf49555 100644 (file)
--- a/slock.c
+++ b/slock.c
@@ -81,7 +81,7 @@ dontkillme(void)
                die("buffer too small\n");
 
        if (fd < 0 || write(fd, value, length) != length || close(fd) != 0)
-               die("cannot disable the out-of-memory killer for this process\n");
+               die("cannot disable the out-of-memory killer for this process (make sure to suid or sgid slock)\n");
 }
 #endif
 
@@ -94,20 +94,18 @@ getpw(void)
        struct passwd *pw;
 
        errno = 0;
-       pw = getpwuid(getuid());
-       if (!pw) {
+       if (!(pw = getpwuid(getuid()))) {
                if (errno)
                        die("slock: getpwuid: %s\n", strerror(errno));
                else
                        die("slock: cannot retrieve password entry\n");
        }
-       rval =  pw->pw_passwd;
+       rval = pw->pw_passwd;
 
 #if HAVE_SHADOW_H
        if (rval[0] == 'x' && rval[1] == '\0') {
                struct spwd *sp;
-               sp = getspnam(getenv("USER"));
-               if (!sp)
+               if (!(sp = getspnam(getenv("USER"))))
                        die("slock: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
                rval = sp->sp_pwdp;
        }
@@ -180,7 +178,7 @@ readpw(Display *dpy, const char *pws)
                                        --len;
                                break;
                        default:
-                               if (num && !iscntrl((int) buf[0]) && (len + num < sizeof(passwd))) {
+                               if (num && !iscntrl((int)buf[0]) && (len + num < sizeof(passwd))) {
                                        memcpy(passwd + len, buf, num);
                                        len += num;
                                }
@@ -232,15 +230,10 @@ lockscreen(Display *dpy, int screen)
        XSetWindowAttributes wa;
        Cursor invisible;
 
-       if (dpy == NULL || screen < 0)
-               return NULL;
-
-       lock = malloc(sizeof(Lock));
-       if (lock == NULL)
+       if (!running || dpy == NULL || screen < 0 || !(lock = malloc(sizeof(Lock))))
                return NULL;
 
        lock->screen = screen;
-
        lock->root = RootWindow(dpy, lock->screen);
 
        for (i = 0; i < NUMCOLS; i++) {
@@ -260,30 +253,31 @@ lockscreen(Display *dpy, int screen)
        XMapRaised(dpy, lock->win);
        if (rr)
                XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
+
+       /* Try to grab mouse pointer *and* keyboard, else fail the lock */
        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)) {
+       if (!len) {
+               fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", screen);
+       } else {
                for (len = 1000; len; len--) {
-                       if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess)
-                               break;
+                       if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess) {
+                               /* everything fine, we grabbed both inputs */
+                               XSelectInput(dpy, lock->root, SubstructureNotifyMask);
+                               return lock;
+                       }
                        usleep(1000);
                }
+               fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen);
        }
-
-       running &= (len > 0);
-       if (!running) {
-               unlockscreen(dpy, lock);
-               lock = NULL;
-       }
-       else {
-               XSelectInput(dpy, lock->root, SubstructureNotifyMask);
-       }
-
-       return lock;
+       /* grabbing one of the inputs failed */
+       running = 0;
+       unlockscreen(dpy, lock);
+       return NULL;
 }
 
 static void
@@ -302,7 +296,7 @@ main(int argc, char **argv) {
        int screen;
 
        if ((argc == 2) && !strcmp("-v", argv[1]))
-               die("slock-%s, © 2006-2015 slock engineers\n", VERSION);
+               die("slock-%s, © 2006-2016 slock engineers\n", VERSION);
 
        if ((argc == 2) && !strcmp("-h", argv[1]))
                usage();
@@ -323,12 +317,11 @@ main(int argc, char **argv) {
        rr = XRRQueryExtension(dpy, &rrevbase, &rrerrbase);
        /* Get the number of screens in display "dpy" and blank them all. */
        nscreens = ScreenCount(dpy);
-       locks = malloc(sizeof(Lock *) * nscreens);
-       if (locks == NULL)
+       if (!(locks = malloc(sizeof(Lock*) * nscreens)))
                die("slock: malloc: %s\n", strerror(errno));
        int nlocks = 0;
        for (screen = 0; screen < nscreens; screen++) {
-               if ( (locks[screen] = lockscreen(dpy, screen)) != NULL)
+               if ((locks[screen] = lockscreen(dpy, screen)) != NULL)
                        nlocks++;
        }
        XSync(dpy, False);