/usr/share/ada/adainclude/anet/anet-sockets-tasking.adb is in libanet0.1-dev 0.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- Copyright (C) 2012 secunet Security Networks AG
-- Copyright (C) 2012 Reto Buerki <reet@codelabs.ch>
-- Copyright (C) 2012 Adrian-Ken Rueegsegger <ken@codelabs.ch>
--
-- This program is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at your
-- option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
--
-- This program 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.
--
-- 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.
--
package body Anet.Sockets.Tasking is
procedure Empty_Cb
(Item : Ada.Streams.Stream_Element_Array;
Src : Socket_Addr_Type) is null;
-- This placeholder callback is needed for initialization of data reception
-- callbacks.
procedure No_Op_Cb
(E : Ada.Exceptions.Exception_Occurrence;
Stop_Flag : in out Boolean) is null;
-- This placeholder callback is needed for initialization of error handling
-- callbacks.
-------------------------------------------------------------------------
function Get_Rcv_Msg_Count (Receiver : Receiver_Type) return Count_Type
is
begin
return Receiver.Item_Count;
end Get_Rcv_Msg_Count;
-------------------------------------------------------------------------
function Is_Listening (Receiver : Receiver_Type) return Boolean
is
begin
return Receiver.Trigger.Is_Listening;
end Is_Listening;
-------------------------------------------------------------------------
procedure Listen
(Receiver : in out Receiver_Type;
Callback : Rcv_Item_Callback)
is
begin
Receiver.Trigger.Activate;
Receiver.R_Task.Listen (Cb => Callback);
end Listen;
-------------------------------------------------------------------------
procedure Register_Error_Handler
(Receiver : in out Receiver_Type;
Callback : Error_Handler_Callback)
is
begin
Receiver.R_Task.Set_Error_Handler (Cb => Callback);
end Register_Error_Handler;
-------------------------------------------------------------------------
procedure Stop (Receiver : in out Receiver_Type)
is
begin
Receiver.Trigger.Shutdown;
Receiver.Trigger.Wait_For_Termination;
end Stop;
-------------------------------------------------------------------------
task body Receiver_Task
is
Data_Callback : Rcv_Item_Callback := Empty_Cb'Access;
Error_Callback : Error_Handler_Callback := No_Op_Cb'Access;
Stop : Boolean := False;
begin
Setup_Loop :
loop
select
accept Listen (Cb : Rcv_Item_Callback)
do
Data_Callback := Cb;
end Listen;
exit Setup_Loop;
or
accept Set_Error_Handler (Cb : Error_Handler_Callback)
do
Error_Callback := Cb;
end Set_Error_Handler;
or
terminate;
end select;
end loop Setup_Loop;
select
Parent.Trigger.Stop;
then abort
Reception_Loop :
loop
declare
Sender : Socket_Addr_Type (Family => Parent.S.Address.Family);
Buffer : Ada.Streams.Stream_Element_Array (1 .. 2048);
Last : Ada.Streams.Stream_Element_Offset;
begin
Parent.S.all.Receive (Src => Sender,
Item => Buffer,
Last => Last);
Data_Callback (Item => Buffer (Buffer'First .. Last),
Src => Sender);
Parent.Item_Count := Parent.Item_Count + 1;
exception
when Ex : others =>
Error_Callback (E => Ex,
Stop_Flag => Stop);
if Stop then
exit Reception_Loop;
end if;
end;
end loop Reception_Loop;
end select;
Parent.Trigger.Signal_Termination;
end Receiver_Task;
-------------------------------------------------------------------------
protected body Trigger_Type
is
----------------------------------------------------------------------
procedure Activate
is
begin
Is_Terminated := False;
end Activate;
----------------------------------------------------------------------
function Is_Listening return Boolean
is
begin
return not Is_Terminated;
end Is_Listening;
----------------------------------------------------------------------
procedure Shutdown
is
begin
Shutdown_Requested := True;
end Shutdown;
----------------------------------------------------------------------
procedure Signal_Termination
is
begin
Is_Terminated := True;
end Signal_Termination;
----------------------------------------------------------------------
entry Stop when Shutdown_Requested
is
begin
null;
end Stop;
----------------------------------------------------------------------
entry Wait_For_Termination when Is_Terminated
is
begin
null;
end Wait_For_Termination;
end Trigger_Type;
end Anet.Sockets.Tasking;
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