applied andres' multi-slock fix, thanks for spotting this issue

1 files changed, 14 insertions, 3 deletions

diff --git a/slock.c b/slock.c
index 320ed2b..154a091 100644
--- a/slock.c
+++ b/slock.c
@@ -1,3 +1,4 @@
+
 /* See LICENSE file for license details. */
 #define _XOPEN_SOURCE 500
 #if HAVE_SHADOW_H
@@ -211,9 +212,9 @@ lockscreen(Display *dpy, int screen) {
                                 break;
                         usleep(1000);
                 }
-                running = (len > 0);
         }
 
+        running &= (len > 0);
         if(!running) {
                 unlockscreen(dpy, lock);
                 lock = NULL;
@@ -257,10 +258,20 @@ main(int argc, char **argv) {
         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);
+        int nlocks = 0;
+        for(screen = 0; screen < nscreens; screen++) {
+                if ( (locks[screen] = lockscreen(dpy, screen)) != NULL)
+                        nlocks++;
+        }
         XSync(dpy, False);
 
+        /* Did we actually manage to lock something? */
+        if (nlocks == 0) { // nothing to protect
+                free(locks);
+                XCloseDisplay(dpy);
+                return 1;
+        }
+
         /* Everything is now blank. Now wait for the correct password. */
 #ifdef HAVE_BSD_AUTH
         readpw(dpy);