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(* Title: Tools/WWW_Find/socket_util.ML
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33817
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Author: Emden R. Gansner and John H. Reppy
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SML Basis Library, section 10
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Routines for working with sockets.
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*)
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signature SOCKET_UTIL =
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sig
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val init_server_socket : string option -> int ->
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Socket.passive INetSock.stream_sock
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val make_streams : Socket.active INetSock.stream_sock
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-> BinIO.instream * BinIO.outstream
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end;
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structure SocketUtil =
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struct
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fun init_server_socket hosto port =
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let
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val sock = INetSock.TCP.socket ();
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val addr =
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(case hosto of
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NONE => INetSock.any port
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| SOME host =>
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NetHostDB.getByName host
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|> the
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|> NetHostDB.addr
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|> rpair port
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|> INetSock.toAddr
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handle Option => raise Fail ("Cannot resolve hostname: " ^ host));
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in
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Socket.bind (sock, addr);
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Socket.listen (sock, 5);
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sock
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end;
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fun make_streams sock =
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let
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val (haddr, port) = INetSock.fromAddr (Socket.Ctl.getSockName sock);
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val sock_name =
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String.concat [ NetHostDB.toString haddr, ":", Int.toString port ];
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val rd =
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BinPrimIO.RD {
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name = sock_name,
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chunkSize = Socket.Ctl.getRCVBUF sock,
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readVec = SOME (fn sz => Socket.recvVec (sock, sz)),
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readArr = SOME (fn buffer => Socket.recvArr (sock, buffer)),
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readVecNB = NONE,
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readArrNB = NONE,
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block = NONE,
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canInput = NONE,
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avail = fn () => NONE,
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getPos = NONE,
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setPos = NONE,
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endPos = NONE,
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verifyPos = NONE,
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close = fn () => Socket.close sock,
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ioDesc = NONE
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};
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val wr =
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BinPrimIO.WR {
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name = sock_name,
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chunkSize = Socket.Ctl.getSNDBUF sock,
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writeVec = SOME (fn buffer => Socket.sendVec (sock, buffer)),
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writeArr = SOME (fn buffer => Socket.sendArr (sock, buffer)),
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writeVecNB = NONE,
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writeArrNB = NONE,
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block = NONE,
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canOutput = NONE,
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getPos = NONE,
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setPos = NONE,
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endPos = NONE,
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verifyPos = NONE,
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close = fn () => Socket.close sock,
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ioDesc = NONE
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};
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val in_strm =
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BinIO.mkInstream (
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BinIO.StreamIO.mkInstream (rd, Word8Vector.fromList []));
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val out_strm =
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BinIO.mkOutstream (
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BinIO.StreamIO.mkOutstream (wr, IO.BLOCK_BUF));
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in (in_strm, out_strm) end;
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end;
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