[DCCP]: Initial dccp_poll implementation

Tested with a patched netcat, no horror stories so far 8)

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dccp/input.c b/net/dccp/input.c
index 02af05e..ef29cef 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -34,6 +34,7 @@
 	dccp_v4_send_reset(sk, DCCP_RESET_CODE_CLOSED);
 	dccp_fin(sk, skb);
 	dccp_set_state(sk, DCCP_CLOSED);
+	sk_wake_async(sk, 1, POLL_HUP);
 }
 
 static void dccp_rcv_closereq(struct sock *sk, struct sk_buff *skb)