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-----------------------------------------------------------------------------
-- --
-- ADASOCKETS COMPONENTS --
-- --
-- L I S T E N E R --
-- --
-- B o d y --
-- --
-- $ReleaseVersion: 0.1.3 $ --
-- --
-- Copyright (C) 1998 École Nationale Supérieure des Télécommunications --
-- --
-- AdaSockets is free software; you can redistribute it and/or modify --
-- it under terms of the GNU General Public License as published by --
-- the Free Software Foundation; either version 2, or (at your option) --
-- any later version. AdaSockets is distributed in the hope that it --
-- will be useful, but WITHOUT ANY WARRANTY; without even the implied --
-- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- See the GNU General Public License for more details. You should --
-- have received a copy of the GNU General Public License distributed --
-- with AdaSockets; see file COPYING. If not, write to the Free --
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA --
-- 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from --
-- this unit, or you link this unit with other files to produce an --
-- executable, this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
-- --
-- The main repository for this software is located at: --
-- http://www-inf.enst.fr/ANC/ --
-- --
-----------------------------------------------------------------------------
with Ada.Exceptions; use Ada.Exceptions;
with Ada.Text_IO; use Ada.Text_IO;
with Sockets; use Sockets;
procedure Listener is
-- Usage: listener
-- Example: listener
-- then telnet localhost `listen_port'
Listen_Port : Positive := 5000;
task type Echo is
entry Start (FD : in Socket_FD);
end Echo;
function Rev (S : String) return String;
-- Reverse a string
----------
-- Echo --
----------
task body Echo is
Sock : Socket_FD;
begin
select
accept Start (FD : in Socket_FD) do
Sock := FD;
end Start;
or
terminate;
end select;
loop
Put_Line (Sock, Rev (Get_Line (Sock)));
end loop;
exception
when Connection_Closed =>
Put_Line ("Connection closed");
Shutdown (Sock, Both);
end Echo;
Accepting_Socket : Socket_FD;
Incoming_Socket : Socket_FD;
type Echo_Access is access Echo;
Dummy : Echo_Access;
---------
-- Rev --
---------
function Rev (S : String) return String is
Result : String (1 .. S'Length);
Index : Natural := 0;
begin
for I in reverse S'Range loop
Index := Index + 1;
Result (Index) := S (I);
end loop;
return Result;
end Rev;
begin
Socket (Accepting_Socket, AF_INET, SOCK_STREAM);
Setsockopt (Accepting_Socket, SOL_SOCKET, SO_REUSEADDR, 1);
Bind (Accepting_Socket, Listen_Port);
Listen (Accepting_Socket);
loop
Put_Line ("Waiting for new connection");
Accept_Socket (Accepting_Socket, Incoming_Socket);
Put_Line ("New connection acknowledged");
Dummy := new Echo;
Dummy.Start (Incoming_Socket);
end loop;
end Listener;
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