[Bug #517554] When a signal happens during the select call in

asyncore.poll, the select fails with EINTR, which the
	code catches. However, the code fails to clear the
	r/w/e arrays (like poll3 does), which means it acts as
	if every descriptor had received all possible events.

Bug report and patch by Cesar Eduardo Barros

Lib/asyncore.py

@@ -80,6 +80,7 @@ def poll (timeout=0.0, map=None):
         except select.error, err:
             if err[0] != EINTR:
                 raise
+            r = []; w = []; e = []
 
         if DEBUG:
             print r,w,e