gistfile1

diff --git i/lib/UV.pm w/lib/UV.pm
index d7962ee..75f62f5 100644
--- i/lib/UV.pm
+++ w/lib/UV.pm
@@ -6,6 +6,9 @@ our $VERSION = '0.1';
 
 XSLoader::load __PACKAGE__, $VERSION;
 
+use constant READABLE => 1;
+use constant WRITABLE => 2;
+
 1;
 
 __END__
diff --git i/t/handles.t w/t/handles.t
index 8808c0d..abc05aa 100644
--- i/t/handles.t
+++ w/t/handles.t
@@ -30,6 +30,7 @@ use UV;
 
     UV::run();
 
+    is scalar(@{UV::handles()}), 0;
     is scalar(@{$handles}), 2;
     is scalar(@{$handles->[0]}), 4;
     is_deeply $handles->[0]->[0], { ref => 1, active => 1, type => UV::TIMER(), closing => 0 };