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From: benjamin_place@hotmail.com (Benjamin Place)
Newsgroups: comp.lang.ada
Subject: Sockets - newbie at a brick wall
Date: 11 Dec 2002 10:40:00 -0800
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Date: 2002-12-11T18:40:00+00:00
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I'm looking for some help writing my first sockets (GNAT.Sockets) app
- there must be something basic that I'm missing.

I start my app My_Server (my_server.adb, below) on newton, then start
My_Client (my_client.adb, below) on einstein. Einstein immediately
reports an error, 

    ben@einstein ben 01:12pm $ ./my_client 

    raised GNAT.SOCKETS.SOCKET_ERROR : [56] Socket is 
    already connected

So what am I doing wrong. Which socket is already connected, and what
should I do differently?

I'm using GNATMAKE 5.00w (20010924) (gcc 3.1) on MacOS 10.1.5.

Thanks for any help,
Ben



--  my_server.adb
with GNAT.Sockets;   use GNAT.Sockets;
with Ada.Text_IO;    use Ada.Text_IO;

procedure My_Server is
   Socket     : Socket_Type;
   Address    : Sock_Addr_Type;
   Channel    : Stream_Access;
   Loop_Count : Natural := 0;
begin

   --  Create an endpoint for communication. Raise Socket_Error on error.
   Create_Socket (Socket, Family_Inet, Socket_Datagram);

   --  Initialize sockaddr_in structure with server (local) socket name
   Address.Addr := Addresses (Get_Host_By_Name ("newton.cannella.org"), 1);
   Address.Port := 4134;

   --  Server should bind the address to the socket
   Bind_Socket (Socket, Address);

   Channel := Stream (Socket, Address);
   
   declare
      Message : String := String'Input (Channel);
   begin
      Address := Get_Address (Channel);
      Put_Line (Message & " from " & Image (Address));
   end;
   
   Shutdown_Socket (Socket);		--  Disconnect socket
   Close_Socket (Socket);		--  Close socket

end My_Server;



--  my_client.adb
with GNAT.Sockets;   use GNAT.Sockets;
with Ada.Text_IO;    use Ada.Text_IO;

procedure My_Client is
   Socket   : Socket_Type;
   Server   : Sock_Addr_Type;
   Channel  : Stream_Access;
begin

   --  Create a client-side socket. Raise Socket_Error on error.
   Create_Socket (Socket, Family_Inet, Socket_Datagram);

   --  Initialize sockaddr_in structure with server
   --  (remote) socket name
   Server := 
     (
      Addr => Addresses (Get_Host_By_Name ("newton.cannella.org"), 1),
      Port => 4134,
      Family => Family_Inet
     );

   Connect_Socket (Socket, Server);
   --  Make a connection to another socket which has the address of
   --  Server. Raise Socket_Error on error.

   Channel := Stream (Socket, Server);

   String'Output (Channel, "Hello, world!");

   Close_Socket (Socket);

end My_Client;