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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T . S O C K E T S . T H I N --
-- --
-- B o d y --
-- --
-- Copyright (C) 2001-2005, AdaCore --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT 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 GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, 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. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This package provides a target dependent thin interface to the sockets
-- layer for use by the GNAT.Sockets package (g-socket.ads). This package
-- should not be directly with'ed by an applications program.
-- This is the default version
with GNAT.OS_Lib; use GNAT.OS_Lib;
with GNAT.Task_Lock;
with Interfaces.C; use Interfaces.C;
package body GNAT.Sockets.Thin is
Non_Blocking_Sockets : constant Fd_Set_Access :=
New_Socket_Set (No_Socket_Set);
-- When this package is initialized with Process_Blocking_IO set
-- to True, sockets are set in non-blocking mode to avoid blocking
-- the whole process when a thread wants to perform a blocking IO
-- operation. But the user can also set a socket in non-blocking
-- mode by purpose. In order to make a difference between these
-- two situations, we track the origin of non-blocking mode in
-- Non_Blocking_Sockets. If S is in Non_Blocking_Sockets, it has
-- been set in non-blocking mode by the user.
Quantum : constant Duration := 0.2;
-- When Thread_Blocking_IO is False, we set sockets in
-- non-blocking mode and we spend a period of time Quantum between
-- two attempts on a blocking operation.
Thread_Blocking_IO : Boolean := True;
-- Comment required for this ???
Unknown_System_Error : constant C.Strings.chars_ptr :=
C.Strings.New_String ("Unknown system error");
-- Comments required for following functions ???
function Syscall_Accept
(S : C.int;
Addr : System.Address;
Addrlen : access C.int) return C.int;
pragma Import (C, Syscall_Accept, "accept");
function Syscall_Connect
(S : C.int;
Name : System.Address;
Namelen : C.int) return C.int;
pragma Import (C, Syscall_Connect, "connect");
function Syscall_Ioctl
(S : C.int;
Req : C.int;
Arg : Int_Access) return C.int;
pragma Import (C, Syscall_Ioctl, "ioctl");
function Syscall_Recv
(S : C.int;
Msg : System.Address;
Len : C.int;
Flags : C.int) return C.int;
pragma Import (C, Syscall_Recv, "recv");
function Syscall_Recvfrom
(S : C.int;
Msg : System.Address;
Len : C.int;
Flags : C.int;
From : Sockaddr_In_Access;
Fromlen : access C.int) return C.int;
pragma Import (C, Syscall_Recvfrom, "recvfrom");
function Syscall_Send
(S : C.int;
Msg : System.Address;
Len : C.int;
Flags : C.int) return C.int;
pragma Import (C, Syscall_Send, "send");
function Syscall_Sendto
(S : C.int;
Msg : System.Address;
Len : C.int;
Flags : C.int;
To : Sockaddr_In_Access;
Tolen : C.int) return C.int;
pragma Import (C, Syscall_Sendto, "sendto");
function Syscall_Socket
(Domain : C.int;
Typ : C.int;
Protocol : C.int) return C.int;
pragma Import (C, Syscall_Socket, "socket");
procedure Disable_SIGPIPE (S : C.int);
pragma Import (C, Disable_SIGPIPE, "__gnat_disable_sigpipe");
function Non_Blocking_Socket (S : C.int) return Boolean;
procedure Set_Non_Blocking_Socket (S : C.int; V : Boolean);
--------------
-- C_Accept --
--------------
function C_Accept
(S : C.int;
Addr : System.Address;
Addrlen : access C.int) return C.int
is
R : C.int;
Val : aliased C.int := 1;
Discard : C.int;
pragma Warnings (Off, Discard);
begin
loop
R := Syscall_Accept (S, Addr, Addrlen);
exit when Thread_Blocking_IO
or else R /= Failure
or else Non_Blocking_Socket (S)
or else Errno /= Constants.EWOULDBLOCK;
delay Quantum;
end loop;
if not Thread_Blocking_IO
and then R /= Failure
then
-- A socket inherits the properties ot its server especially
-- the FIONBIO flag. Do not use C_Ioctl as this subprogram
-- tracks sockets set in non-blocking mode by user.
Set_Non_Blocking_Socket (R, Non_Blocking_Socket (S));
Discard := Syscall_Ioctl (R, Constants.FIONBIO, Val'Unchecked_Access);
end if;
Disable_SIGPIPE (R);
return R;
end C_Accept;
---------------
-- C_Connect --
---------------
function C_Connect
(S : C.int;
Name : System.Address;
Namelen : C.int) return C.int
is
Res : C.int;
begin
Res := Syscall_Connect (S, Name, Namelen);
if Thread_Blocking_IO
or else Res /= Failure
or else Non_Blocking_Socket (S)
or else Errno /= Constants.EINPROGRESS
then
return Res;
end if;
declare
WSet : Fd_Set_Access;
Now : aliased Timeval;
begin
WSet := New_Socket_Set (No_Socket_Set);
loop
Insert_Socket_In_Set (WSet, S);
Now := Immediat;
Res := C_Select
(S + 1,
No_Fd_Set,
WSet,
No_Fd_Set,
Now'Unchecked_Access);
exit when Res > 0;
if Res = Failure then
Free_Socket_Set (WSet);
return Res;
end if;
delay Quantum;
end loop;
Free_Socket_Set (WSet);
end;
Res := Syscall_Connect (S, Name, Namelen);
if Res = Failure
and then Errno = Constants.EISCONN
then
return Thin.Success;
else
return Res;
end if;
end C_Connect;
-------------
-- C_Ioctl --
-------------
function C_Ioctl
(S : C.int;
Req : C.int;
Arg : Int_Access) return C.int
is
begin
if not Thread_Blocking_IO
and then Req = Constants.FIONBIO
then
if Arg.all /= 0 then
Set_Non_Blocking_Socket (S, True);
end if;
end if;
return Syscall_Ioctl (S, Req, Arg);
end C_Ioctl;
------------
-- C_Recv --
------------
function C_Recv
(S : C.int;
Msg : System.Address;
Len : C.int;
Flags : C.int) return C.int
is
Res : C.int;
begin
loop
Res := Syscall_Recv (S, Msg, Len, Flags);
exit when Thread_Blocking_IO
or else Res /= Failure
or else Non_Blocking_Socket (S)
or else Errno /= Constants.EWOULDBLOCK;
delay Quantum;
end loop;
return Res;
end C_Recv;
----------------
-- C_Recvfrom --
----------------
function C_Recvfrom
(S : C.int;
Msg : System.Address;
Len : C.int;
Flags : C.int;
From : Sockaddr_In_Access;
Fromlen : access C.int) return C.int
is
Res : C.int;
begin
loop
Res := Syscall_Recvfrom (S, Msg, Len, Flags, From, Fromlen);
exit when Thread_Blocking_IO
or else Res /= Failure
or else Non_Blocking_Socket (S)
or else Errno /= Constants.EWOULDBLOCK;
delay Quantum;
end loop;
return Res;
end C_Recvfrom;
------------
-- C_Send --
------------
function C_Send
(S : C.int;
Msg : System.Address;
Len : C.int;
Flags : C.int) return C.int
is
Res : C.int;
begin
loop
Res := Syscall_Send (S, Msg, Len, Flags);
exit when Thread_Blocking_IO
or else Res /= Failure
or else Non_Blocking_Socket (S)
or else Errno /= Constants.EWOULDBLOCK;
delay Quantum;
end loop;
return Res;
end C_Send;
--------------
-- C_Sendto --
--------------
function C_Sendto
(S : C.int;
Msg : System.Address;
Len : C.int;
Flags : C.int;
To : Sockaddr_In_Access;
Tolen : C.int) return C.int
is
Res : C.int;
begin
loop
Res := Syscall_Sendto (S, Msg, Len, Flags, To, Tolen);
exit when Thread_Blocking_IO
or else Res /= Failure
or else Non_Blocking_Socket (S)
or else Errno /= Constants.EWOULDBLOCK;
delay Quantum;
end loop;
return Res;
end C_Sendto;
--------------
-- C_Socket --
--------------
function C_Socket
(Domain : C.int;
Typ : C.int;
Protocol : C.int) return C.int
is
R : C.int;
Val : aliased C.int := 1;
Discard : C.int;
pragma Unreferenced (Discard);
begin
R := Syscall_Socket (Domain, Typ, Protocol);
if not Thread_Blocking_IO
and then R /= Failure
then
-- Do not use C_Ioctl as this subprogram tracks sockets set
-- in non-blocking mode by user.
Discard := Syscall_Ioctl (R, Constants.FIONBIO, Val'Unchecked_Access);
Set_Non_Blocking_Socket (R, False);
end if;
Disable_SIGPIPE (R);
return R;
end C_Socket;
--------------
-- Finalize --
--------------
procedure Finalize is
begin
null;
end Finalize;
----------------
-- Initialize --
----------------
procedure Initialize (Process_Blocking_IO : Boolean) is
begin
Thread_Blocking_IO := not Process_Blocking_IO;
end Initialize;
-------------------------
-- Non_Blocking_Socket --
-------------------------
function Non_Blocking_Socket (S : C.int) return Boolean is
R : Boolean;
begin
Task_Lock.Lock;
R := (Is_Socket_In_Set (Non_Blocking_Sockets, S) /= 0);
Task_Lock.Unlock;
return R;
end Non_Blocking_Socket;
-----------------
-- Set_Address --
-----------------
procedure Set_Address
(Sin : Sockaddr_In_Access;
Address : In_Addr)
is
begin
Sin.Sin_Addr := Address;
end Set_Address;
----------------
-- Set_Family --
----------------
procedure Set_Family
(Sin : Sockaddr_In_Access;
Family : C.int)
is
begin
Sin.Sin_Family := C.unsigned_short (Family);
end Set_Family;
----------------
-- Set_Length --
----------------
procedure Set_Length
(Sin : Sockaddr_In_Access;
Len : C.int)
is
pragma Unreferenced (Sin);
pragma Unreferenced (Len);
begin
null;
end Set_Length;
-----------------------------
-- Set_Non_Blocking_Socket --
-----------------------------
procedure Set_Non_Blocking_Socket (S : C.int; V : Boolean) is
begin
Task_Lock.Lock;
if V then
Insert_Socket_In_Set (Non_Blocking_Sockets, S);
else
Remove_Socket_From_Set (Non_Blocking_Sockets, S);
end if;
Task_Lock.Unlock;
end Set_Non_Blocking_Socket;
--------------
-- Set_Port --
--------------
procedure Set_Port
(Sin : Sockaddr_In_Access;
Port : C.unsigned_short)
is
begin
Sin.Sin_Port := Port;
end Set_Port;
--------------------------
-- Socket_Error_Message --
--------------------------
function Socket_Error_Message
(Errno : Integer) return C.Strings.chars_ptr
is
use type Interfaces.C.Strings.chars_ptr;
C_Msg : C.Strings.chars_ptr;
begin
C_Msg := C_Strerror (C.int (Errno));
if C_Msg = C.Strings.Null_Ptr then
return Unknown_System_Error;
else
return C_Msg;
end if;
end Socket_Error_Message;
end GNAT.Sockets.Thin;