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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: TCP Server & Client
Date: Sun, 25 Mar 2018 09:22:29 +0100
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Date: 2018-03-25T09:22:29+01:00
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Andrew Shvets <andrew.shvets@gmail.com> writes:

> procedure TCP_Client is
[...]
>   GNAT.Sockets.Create_Socket(Socket, GNAT.Sockets.Family_Inet, GNAT.Sockets.Socket_Stream);

>   GNAT.Sockets.Set_Socket_Option(Socket, GNAT.Sockets.Socket_Level, (GNAT.Sockets.Reuse_Address, True));

>   GNAT.Sockets.Send_Socket(Socket, Data, Last, Address);

If you look at the spec of GNAT.Sockets for a long time you will see
that there are 3 versions of Send_Socket, only 2 of which I would expect
to use, and you've chosen the wrong one (the last, datagram,
version). You need the second:

   procedure Send_Socket
     (Socket : Socket_Type;
      Item   : Ada.Streams.Stream_Element_Array;
      Last   : out Ada.Streams.Stream_Element_Offset;
      Flags  : Request_Flag_Type := No_Request_Flag);

More importantly, you've left out the Connect_Socket call (which is what
the server Accept_Socket call is waiting for).

Check out the commentary at the beginning of g-socket.ads, look for
'task body ping'.


Also, in TCP_Server, you should be calling Receive_Socket on Sock (the
new socket which is actually connected to TCP_Client).