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339 | -- Copyright (C) 2020 Glen Cornell <glen.m.cornell@gmail.com>
--
-- 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 3 of the
-- License, or (at your option) any later version.
--
-- 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.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see
-- <http://www.gnu.org/licenses/>.
with Interfaces.C;
with Ada.Io_Exceptions;
-- Suppress warning generated by referencing internal GNAT packages.
pragma Warnings (Off, """*"" is an internal GNAT unit");
with Gnat.Sockets.Thin;
with Gnat.Sockets.Thin_Common;
with Sockets.Os_Constants;
with System.Os_Constants;
pragma Warnings (On, """*"" is an internal GNAT unit");
with Sockets.Can_Thin;
package body Sockets.Can is
package C renames Interfaces.C;
use type C.Int;
use type C.Unsigned;
-- Conversion of Ada typed objects to typeless C types:
type Family_To_C_Type is array (Family_Type) of C.Int;
type Mode_To_C_Type is array (Mode_Type) of C.Int;
type Protocol_To_C_Type is array (Protocol_Type) of C.Int;
Family_To_C : constant Family_To_C_Type :=
(Family_Can => Sockets.Os_Constants.Af_Can);
Mode_To_C : constant Mode_To_C_Type :=
(Socket_Dgram => System.Os_Constants.Sock_Dgram,
Socket_Raw => Sockets.Os_Constants.Sock_Raw);
Protocol_To_C : constant Protocol_To_C_Type :=
(Can_Raw => Sockets.Os_Constants.Can_Raw,
Can_Bcm => Sockets.Os_Constants.Can_Bcm);
----------------------
-- If_Name_To_Index --
----------------------
function If_Name_To_Index (If_Name : String) return Natural is
If_Index : C.Unsigned;
begin
If_Index := Sockets.Can_Thin.If_Nametoindex(C.To_C(If_Name));
if If_Index = 0 then
Raise_Socket_Error (sockets.can_thin.socket_errno);
end if;
return Natural (If_Index);
end If_Name_To_Index;
--------------------------
-- Enable_CAN_FD_Frames --
--------------------------
procedure Enable_CAN_FD_Frames
(Socket : Socket_Type;
Is_Enabled : Boolean) is
Res : C.int;
Enable : C.Int := (if Is_Enabled then 1 else 0);
begin
Res := Gnat.Sockets.Thin.C_Setsockopt
(S => C.Int(Gnat.Sockets.To_C(Socket)),
Level => Sockets.Os_Constants.SOL_CAN_RAW,
Optname => Sockets.Os_Constants.CAN_RAW_FD_FRAMES,
Optval => Enable'Address,
Optlen => Enable'Size / 8);
if Res = Gnat.Sockets.Thin_Common.Failure then
Raise_Socket_Error (Sockets.Can_Thin.Socket_Errno);
return;
end if;
end Enable_CAN_FD_Frames;
-------------------
-- Create_Socket --
-------------------
procedure Create_Socket
(Socket : out Socket_Type;
Family : in Family_Type := Family_Can;
Mode : in Mode_Type := Socket_Raw;
Protocol : in Protocol_Type := Can_Raw) is
Res : C.int;
begin
Res := Gnat.Sockets.Thin.C_Socket (Family_To_C(Family),
Mode_To_C(Mode),
Protocol_To_C(Protocol));
if Res = Gnat.Sockets.Thin_Common.Failure then
Raise_Socket_Error (Sockets.Can_Thin.Socket_Errno);
return;
end if;
Socket := Gnat.Sockets.To_Ada (Integer(Res));
end Create_Socket;
--------------------
-- Connect_Socket --
--------------------
procedure Connect_Socket
(Socket : Socket_Type;
Address : Sock_Addr_Type) is
Res : C.int;
Addr : aliased Sockets.Can_Thin.Sockaddr_Can;
Sizeof_Addr : constant C.Int := (Sockets.Can_Thin.Sockaddr_Can'Size + 7) / 8;
begin
Addr.Can_Family := Sockets.Os_Constants.Af_Can;
Addr.Can_Ifindex := C.Unsigned (Address.If_Index);
Addr.Can_Addr := (Rx_Id => 0, Tx_Id => 0);
Res := Gnat.Sockets.Thin.C_Connect (C.Int(Gnat.Sockets.To_C(Socket)),
Addr'Address,
Sizeof_Addr);
if Res = Gnat.Sockets.Thin_Common.Failure then
Raise_Socket_Error (sockets.can_thin.socket_errno);
return;
end if;
end Connect_Socket;
-----------------
-- Bind_Socket --
-----------------
procedure Bind_Socket
(Socket : Socket_Type;
Address : Sock_Addr_Type) is
Res : C.int;
Addr : aliased Sockets.Can_Thin.Sockaddr_Can;
Sizeof_Addr : constant C.Int := (Sockets.Can_Thin.Sockaddr_Can'Size + 7) / 8;
begin
Addr.Can_Family := Sockets.Os_Constants.Af_Can;
Addr.Can_Ifindex := C.Unsigned (Address.If_Index);
Addr.Can_Addr := (Rx_Id => 0, Tx_Id => 0);
Res := Gnat.Sockets.Thin.C_Bind (C.Int(Gnat.Sockets.To_C(Socket)),
Addr'Address,
Sizeof_Addr);
if Res = Gnat.Sockets.Thin_Common.Failure then
Raise_Socket_Error (sockets.can_thin.socket_errno);
return;
end if;
end Bind_Socket;
-------------------
-- Apply_Filters --
-------------------
procedure Apply_Filters
(Socket : Socket_Type;
Filters : Can_Filter_Array_Type;
Are_Can_Fd_Frames_Enabled : Boolean := False) is
Res : C.int;
begin
Res := Gnat.Sockets.Thin.C_Setsockopt
(S => C.Int(Gnat.Sockets.To_C(Socket)),
Level => Sockets.Os_Constants.SOL_CAN_RAW,
Optname => Sockets.Os_Constants.CAN_RAW_FILTER,
Optval => Filters'Address,
Optlen => Filters'Size / 8);
if Res = Gnat.Sockets.Thin_Common.Failure then
Raise_Socket_Error (Sockets.Can_Thin.Socket_Errno);
return;
end if;
Enable_Can_Fd_Frames (Socket, Are_Can_Fd_Frames_Enabled);
end Apply_Filters;
----------
-- Open --
----------
function Open (If_Name : String) return Socket_Type is
Socket : Socket_Type;
Address : Sock_Addr_Type;
begin
Create_Socket(Socket);
Address.If_Index := If_Name_To_Index(If_Name);
Bind_Socket(Socket, Address);
return Socket;
end Open;
--------------------
-- Receive_Socket --
--------------------
procedure Receive_Socket
(Socket : Socket_Type;
Item : out Sockets.Can_Frame.Can_Frame) is
Sizeof_Frame : constant Integer := (Sockets.Can_Frame.Can_Frame'Size + 7) / 8;
Buf : aliased Ada.Streams.Stream_Element_Array (1 .. Ada.Streams.Stream_Element_Offset(Sizeof_Frame));
for Buf'Address use Item'Address;
pragma Import (Ada, Buf);
Unused_Last : Ada.Streams.Stream_Element_Offset;
begin
Gnat.Sockets.Receive_Socket(Socket, Buf, Unused_Last);
end Receive_Socket;
-----------------
-- Send_Socket --
-----------------
procedure Send_Socket
(Socket : Socket_Type;
Item : Sockets.Can_Frame.Can_Frame) is
Sizeof_Frame : constant Integer := (Sockets.Can_Frame.Can_Frame'Size + 7) / 8;
Buf : aliased Ada.Streams.Stream_Element_Array (1 .. Ada.Streams.Stream_Element_Offset(Sizeof_Frame));
for Buf'Address use Item'Address;
pragma Import (Ada, Buf);
Unused_Last : Ada.Streams.Stream_Element_Offset;
begin
Gnat.Sockets.Send_Socket(Socket, Buf, Unused_Last);
end Send_Socket;
-------------------
-- Create_Stream --
-------------------
procedure Create_Stream (Stream : in out Can_Stream; Socket : Socket_Type) is
begin
Stream.Socket := Socket;
Stream.Read_Offset := Read_Buffer_End;
Stream.Write_Offset := Write_Buffer_First;
end Create_Stream;
----------
-- Open --
----------
procedure Open (Stream : in out Can_Stream; If_Name : in String) is
begin
Stream.Socket := Open (If_Name);
Stream.Read_Offset := Read_Buffer_End;
Stream.Write_Offset := Write_Buffer_First;
end Open;
----------
-- Read --
----------
procedure Read (Stream : in out Can_Stream;
Item : out Ada.Streams.Stream_Element_Array;
Last : out Ada.Streams.Stream_Element_Offset) is
Requested_Size : Ada.Streams.Stream_Element_Offset := Item'Length;
Remainaing_Size_Of_Read_Buffer : Ada.Streams.Stream_Element_Offset := Stream.Read_Buffer'Last - Stream.Read_Offset + 1;
begin
if Remainaing_Size_Of_Read_Buffer <= 0 then
Gnat.Sockets.Receive_Socket(Stream.Socket, Stream.Read_Buffer, Remainaing_Size_Of_Read_Buffer);
Stream.Read_Offset := Read_Buffer_First;
end if;
if Requested_Size > Remainaing_Size_Of_Read_Buffer then
Requested_Size := Remainaing_Size_Of_Read_Buffer;
end if;
Item (Item'First .. Requested_Size) := Stream.Read_Buffer (Stream.Read_Offset .. Stream.Read_Offset + Requested_Size - 1);
Stream.Read_Offset := Stream.Read_Offset + Requested_Size;
Last := Item'First + Requested_Size - 1;
end Read;
-----------
-- Write --
-----------
procedure Write (Stream : in out Can_Stream;
Item : Ada.Streams.Stream_Element_Array) is
Last : Ada.Streams.Stream_Element_Offset := Stream.Write_Offset + Item'Length - 1;
begin
if Last > Write_Buffer_Last then
raise Ada.Io_Exceptions.End_Error;
end if;
Stream.Write_Buffer (Stream.Write_Offset .. Last) := Item;
Stream.Write_Offset := Stream.Write_Offset + Item'Length;
if Last = Sizeof_Frame then
Gnat.Sockets.Send_Socket (Stream.Socket, Stream.Write_Buffer, Last);
Stream.Write_Offset := Write_Buffer_First;
end if;
end Write;
----------------
-- Flush_Read --
----------------
procedure Flush_Read (Stream : in out Can_Stream) is
begin
Stream.Read_Offset := Read_Buffer_End;
end Flush_Read;
-----------------
-- Flush_Write --
-----------------
procedure Flush_Write (Stream : in out Can_Stream) is
Unused_Last : Ada.Streams.Stream_Element_Offset;
begin
if Stream.Write_Offset > Write_Buffer_First then
Gnat.Sockets.Send_Socket (Stream.Socket, Stream.Write_Buffer, Unused_Last);
Stream.Write_Offset := Write_Buffer_First;
end if;
end Flush_Write;
------------------------
-- Raise_Socket_Error --
------------------------
procedure Raise_Socket_Error (Error : Integer) is
begin
raise Socket_Error with
Err_Code_Image (Error) & Sockets.Can_Thin.Socket_Error_Message (Error);
end Raise_Socket_Error;
--------------------
-- Err_Code_Image --
--------------------
function Err_Code_Image (E : Integer) return String is
Msg : String := E'Img & "] ";
begin
Msg (Msg'First) := '[';
return Msg;
end Err_Code_Image;
end Sockets.Can;
|