diff -r e08c9f755fca -r f6a4da31f2f1 src/Tools/WWW_Find/socket_util.ML
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Tools/WWW_Find/socket_util.ML	Fri Nov 20 18:36:44 2009 +1100
@@ -0,0 +1,94 @@
+(*  Title:      socket_util.ML
+    Author:     Emden R. Gansner and John H. Reppy
+                SML Basis Library, section 10
+
+Routines for working with sockets.
+*)
+
+signature SOCKET_UTIL =
+sig
+  val init_server_socket : string option -> int ->
+                           Socket.passive INetSock.stream_sock
+
+  val make_streams : Socket.active INetSock.stream_sock
+                     -> BinIO.instream * BinIO.outstream
+end;
+
+structure SocketUtil =
+struct
+
+fun init_server_socket hosto port =
+  let
+    val sock = INetSock.TCP.socket ();
+    val addr =
+      (case hosto of
+         NONE => INetSock.any port
+       | SOME host =>
+           NetHostDB.getByName host
+           |> the
+           |> NetHostDB.addr
+           |> rpair port
+           |> INetSock.toAddr
+           handle Option => raise Fail ("Cannot resolve hostname: " ^ host));
+  in
+    Socket.bind (sock, addr);
+    Socket.listen (sock, 5);
+    sock
+  end;
+
+fun make_streams sock =
+  let
+    val (haddr, port) = INetSock.fromAddr (Socket.Ctl.getSockName sock);
+
+    val sock_name =
+      String.concat [ NetHostDB.toString haddr, ":", Int.toString port ];
+
+    val rd =
+      BinPrimIO.RD {
+        name = sock_name,
+        chunkSize = Socket.Ctl.getRCVBUF sock,
+        readVec = SOME (fn sz => Socket.recvVec (sock, sz)),
+        readArr = SOME (fn buffer => Socket.recvArr (sock, buffer)),
+        readVecNB = NONE,
+        readArrNB = NONE,
+        block = NONE,
+        canInput = NONE,
+        avail = fn () => NONE,
+        getPos = NONE,
+        setPos = NONE,
+        endPos = NONE,
+        verifyPos = NONE,
+        close = fn () => Socket.close sock,
+        ioDesc = NONE
+      };
+
+    val wr =
+      BinPrimIO.WR {
+        name = sock_name,
+        chunkSize = Socket.Ctl.getSNDBUF sock,
+        writeVec = SOME (fn buffer => Socket.sendVec (sock, buffer)),
+        writeArr = SOME (fn buffer => Socket.sendArr (sock, buffer)),
+        writeVecNB = NONE,
+        writeArrNB = NONE,
+        block = NONE,
+        canOutput = NONE,
+        getPos = NONE,
+        setPos = NONE,
+        endPos = NONE,
+        verifyPos = NONE,
+        close = fn () => Socket.close sock,
+        ioDesc = NONE
+      };
+
+    val in_strm =
+      BinIO.mkInstream (
+        BinIO.StreamIO.mkInstream (rd, Word8Vector.fromList []));
+
+    val out_strm =
+      BinIO.mkOutstream (
+        BinIO.StreamIO.mkOutstream (wr, IO.BLOCK_BUF));
+
+    in (in_strm, out_strm) end;
+
+end;
+