added hl UdpSocket support

std/hl/_std/sys/net/Socket.hx

@@ -118,7 +118,7 @@ class Socket {
 	}
 
 	function init() : Void {
-		__s = socket_new(false);
+		if( __s == null ) __s = socket_new(false);
 		input = new SocketInput(this);
 		output = new SocketOutput(this);
 	}

std/hl/_std/sys/net/UdpSocket.hx

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C)2005-2018 Haxe Foundation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+package sys.net;
+import sys.net.Socket;
+import haxe.io.Error;
+
+class UdpSocket extends Socket {
+
+	public function new() {
+		super();
+	}
+
+	override function init() : Void {
+		__s = Socket.socket_new(true);
+		super.init();
+	}
+	
+	public function sendTo( buf : haxe.io.Bytes, pos : Int, len : Int, addr : Address ) : Int {
+		if( pos < 0 || len < 0 || pos + len > buf.length ) throw OutsideBounds;
+		return try {
+			socket_send_to(__s, (buf:hl.Bytes).offset(pos), len, addr.host, addr.port);
+		} catch( e : Dynamic ) {
+			if( e == "Blocking" )
+				throw Blocked;
+			else
+				throw Custom(e);
+		}
+	}
+
+	public function readFrom( buf : haxe.io.Bytes, pos : Int, len : Int, addr : Address ) : Int {
+		var r;
+		var host = 0, port = 0;
+		if( pos < 0 || len < 0 || pos + len > buf.length ) throw OutsideBounds;
+		try {
+			r = socket_recv_from(__s,(buf:hl.Bytes).offset(pos),len,host,port);
+		} catch( e : Dynamic ) {
+			if( e == "Blocking" )
+				throw Blocked;
+			else
+				throw Custom(e);
+		}
+		if( r == 0 )
+			throw new haxe.io.Eof();
+		addr.host = host;
+		addr.port = port;
+		return r;
+	}
+
+	@:hlNative("std","socket_send_to") static function socket_send_to( s : SocketHandle, bytes : hl.Bytes, len : Int, host : Int, port : Int ) : Int { return 0; }
+
+	@:hlNative("std","socket_recv_from") static function socket_recv_from( s : SocketHandle, bytes : hl.Bytes, len : Int, host : hl.Ref<Int>, port : hl.Ref<Int> ) : Int { return 0; }
+	
+}