fix issue #2944: asyncore doesn't handle connection refused correctly (patch by Alexander Shigin)

Lib/asyncore.py

@@ -435,8 +435,11 @@ class dispatcher:
             self.handle_read()
 
     def handle_connect_event(self):
-        self.connected = True
+        err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
+        if err != 0:
+            raise socket.error(err, _strerror(err))
         self.handle_connect()
+        self.connected = True
 
     def handle_write_event(self):
         if self.accepting:

Misc/ACKS

@@ -871,3 +871,4 @@ Uwe Zessin
 Tarek Ziadé
 Peter Åstrand
 Andrej Krpic
+Alexander Shigin

Misc/NEWS

@@ -24,6 +24,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #2944: asyncore doesn't handle connection refused correctly.
+
 - Issue #3196: email header decoding is now forgiving if an RFC2047
   encoded word encoded in base64 is lacking padding.