Add recvfrom and sendto.

We leave them for compatibility, but mark them as deprecated.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>

src/libstd/io/net/udp.rs

@@ -82,6 +82,13 @@ impl UdpSocket {
         }
     }
 
+    #[allow(missing_doc)]
+    #[deprecated = "renamed to `recv_from`"]
+    pub fn recvfrom(&mut self, buf: &mut [u8])
+                    -> IoResult<(uint, SocketAddr)> {
+        self.recv_from(buf)
+    }
+
     /// Sends data on the socket to the given address. Returns nothing on
     /// success.
     pub fn send_to(&mut self, buf: &[u8], dst: SocketAddr) -> IoResult<()> {
@@ -91,6 +98,12 @@ impl UdpSocket {
         }).map_err(IoError::from_rtio_error)
     }
 
+    #[allow(missing_doc)]
+    #[deprecated = "renamed to `send_to`"]
+    pub fn sendto(&mut self, buf: &[u8], dst: SocketAddr) -> IoResult<()> {
+        self.send_to(buf, dst)
+    }
+
     /// Creates a `UdpStream`, which allows use of the `Reader` and `Writer`
     /// traits to receive and send data from the same address. This transfers
     /// ownership of the socket to the stream.