Fixes #74, removing filenos from the hub when they raise a value error, thanks to Edward George for the repro and fix.

AUTHORS

@@ -67,3 +67,4 @@ Thanks To
 * Malcolm Cleaton, patch for Event exception handling
 * Alexey Borzenkov, for finding and fixing issues with Windows error detection (#66, #69), reducing dependencies in zeromq hub (#71)
 * Anonymous, finding and fixing error in websocket chat example (#70)
+* Edward George, finding and fixing an issue in the [e]poll hubs (#74)

eventlet/hubs/poll.py

@@ -38,21 +38,26 @@ class Hub(BaseHub):
             mask |= READ_MASK | EXC_MASK
         if self.listeners[WRITE].get(fileno):
             mask |= WRITE_MASK | EXC_MASK
-        if mask:
-            if new:
-                self.poll.register(fileno, mask)
-            else:
-                try:
-                    self.modify(fileno, mask)
-                except (IOError, OSError):
+        try:
+            if mask:
+                if new:
                     self.poll.register(fileno, mask)
-        else: 
-            try:
-                self.poll.unregister(fileno)
-            except (KeyError, IOError, OSError):
-                # raised if we try to remove a fileno that was
-                # already removed/invalid
-                pass
+                else:
+                    try:
+                        self.modify(fileno, mask)
+                    except (IOError, OSError):
+                        self.poll.register(fileno, mask)
+            else: 
+                try:
+                    self.poll.unregister(fileno)
+                except (KeyError, IOError, OSError):
+                    # raised if we try to remove a fileno that was
+                    # already removed/invalid
+                    pass
+        except ValueError:
+            # fileno is bad, issue 74
+            self.remove_descriptor(fileno)
+            raise
 
     def remove_descriptor(self, fileno):
         super(Hub, self).remove_descriptor(fileno)

tests/hub_test.py

@@ -168,6 +168,7 @@ class TestHubBlockingDetector(LimitedTestCase):
         gt = eventlet.spawn(look_im_blocking)
         self.assertRaises(RuntimeError, gt.wait)
         debug.hub_blocking_detection(False)
+        
 
 class TestSuspend(LimitedTestCase):
     TEST_TIMEOUT=3
@@ -205,6 +206,14 @@ except eventlet.Timeout:
         shutil.rmtree(self.tempdir)
 
 
+class TestBadFilenos(LimitedTestCase):
+    @skip_with_pyevent
+    def test_repeated_selects(self):
+        from eventlet.green import select
+        self.assertRaises(ValueError, select.select, [-1], [], [])
+        self.assertRaises(ValueError, select.select, [-1], [], [])
+
+
 class Foo(object):
     pass