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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T . S O C K E T S . T H I N . S I G N A L L I N G _ F D S --
-- --
-- B o d y --
-- --
-- Copyright (C) 2001-2020, 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 3, 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- Portable sockets-based implementation of GNAT.Sockets.Thin.Signalling_Fds
-- used for platforms that do not support UNIX pipes.
-- Note: this code used to be in GNAT.Sockets, but has been moved to a
-- platform-specific file. It is now used only for non-UNIX platforms.
separate (GNAT.Sockets.Thin)
package body Signalling_Fds is
-----------
-- Close --
-----------
procedure Close (Sig : C.int) is
Res : C.int;
pragma Unreferenced (Res);
-- Res is assigned but never read, because we purposefully ignore
-- any error returned by the C_Close system call, as per the spec
-- of this procedure.
begin
Res := C_Close (Sig);
end Close;
------------
-- Create --
------------
function Create (Fds : not null access Fd_Pair) return C.int is
Res : constant C.int :=
C_Socketpair (SOSC.AF_INET, SOSC.SOCK_STREAM, 0, Fds);
begin
if Res /= Failure then
-- Set TCP_NODELAY on Fds (Write_End), since we always want to send
-- the data out immediately.
Set_Socket_Option
(Socket => Socket_Type (Fds (Write_End)),
Level => IP_Protocol_For_TCP_Level,
Option => (Name => No_Delay, Enabled => True));
end if;
return Res;
end Create;
----------
-- Read --
----------
function Read (Rsig : C.int) return C.int is
Buf : aliased Character;
begin
return C_Recv (Rsig, Buf'Address, 1, SOSC.MSG_Forced_Flags);
end Read;
-----------
-- Write --
-----------
function Write (Wsig : C.int) return C.int is
Buf : aliased Character := ASCII.NUL;
begin
return C_Sendto
(Wsig, Buf'Address, 1,
Flags => SOSC.MSG_Forced_Flags,
To => System.Null_Address,
Tolen => 0);
end Write;
end Signalling_Fds;
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