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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- GNAT.SOCKETS.THIN.SOCKET_ERROR_MESSAGE --
-- --
-- B o d y --
-- --
-- Copyright (C) 2007-2009, 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. --
-- --
------------------------------------------------------------------------------
-- This is the default implementation of this unit, using the standard C
-- library's strerror(3) function. It is used on all platforms except Windows,
-- since on that platform socket errno values are distinct from the system
-- ones: there is a specific variant of this function in g-socthi-mingw.adb.
with Ada.Unchecked_Conversion;
with System.CRTL;
separate (GNAT.Sockets.Thin)
function Socket_Error_Message
(Errno : Integer) return C.Strings.chars_ptr
is
use type Interfaces.C.Strings.chars_ptr;
pragma Warnings (Off);
function To_Chars_Ptr is
new Ada.Unchecked_Conversion
(System.Address, Interfaces.C.Strings.chars_ptr);
-- On VMS, the compiler warns because System.Address is 64 bits, but
-- chars_ptr is 32 bits. It should be safe, though, because strerror
-- will return a 32-bit pointer.
pragma Warnings (On);
C_Msg : C.Strings.chars_ptr;
begin
C_Msg := To_Chars_Ptr (System.CRTL.strerror (Errno));
if C_Msg = C.Strings.Null_Ptr then
return Unknown_System_Error;
else
return C_Msg;
end if;
end Socket_Error_Message;
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