infy fix

Changes

@@ -1,5 +1,7 @@
 Revision history for libev, a high-performance and full-featured event loop.
 
+        - fix a bug where an inotify watcher was added twice, causing
+          freezes on hash collisions.
 	- new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use
           a direct syscall - slower, but no dependency on librt et al.
         - assume negative return values != -1 signals success of port_getn
@@ -10,6 +12,7 @@ Revision history for libev, a high-performance and full-featured event loop.
         - fixed const object callbacks in ev++.h.
         - replaced loop_ref argument of watcher.set (loop) by a direct
           ev_loop * in ev++.h, to avoid clashes with functor patch.
+        - do not try to watch the empty string via inotify.
 
 3.49 Wed Nov 19 11:26:53 CET 2008
 	- ev_stat watchers will now use inotify as a mere hint on

ev.c

@@ -2480,8 +2480,8 @@ infy_add (EV_P_ ev_stat *w)
 
               char *pend = strrchr (path, '/');
 
-              if (!pend)
-                break; /* whoops, no '/', complain to your admin */
+              if (!pend || pend == path)
+                break;
 
               *pend = 0;
               w->wd = inotify_add_watch (fs_fd, path, mask);
@@ -2489,7 +2489,8 @@ infy_add (EV_P_ ev_stat *w)
           while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
         }
     }
-  else
+
+  if (w->wd >= 0)
     {
       wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
 
@@ -2549,6 +2550,7 @@ infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
             {
               if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
                 {
+                  wlist_del (&fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
                   w->wd = -1;
                   infy_add (EV_A_ w); /* re-add, no matter what */
                 }