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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 System.CRTL.Runtime;

separate (GNAT.Sockets.Thin)

--------------------------

-- Socket_Error_Message --

--------------------------

function Socket_Error_Message

  (Errno : Integer) return C.Strings.chars_ptr

is

   use type Interfaces.C.Strings.chars_ptr;

   C_Msg : constant C.Strings.chars_ptr :=

             System.CRTL.Runtime.strerror (Errno);

begin

   if C_Msg = C.Strings.Null_Ptr then

      return Unknown_System_Error;

   else

      return C_Msg;

   end if;

end Socket_Error_Message;