1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                  GNAT.SOCKETS.THIN.SOCKET_ERROR_MESSAGE                  --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--                     Copyright (C) 2007-2009, AdaCore                     --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32--  This is the default implementation of this unit, using the standard C
33--  library's strerror(3) function. It is used on all platforms except Windows,
34--  since on that platform socket errno values are distinct from the system
35--  ones: there is a specific variant of this function in g-socthi-mingw.adb.
36
37with System.CRTL.Runtime;
38
39separate (GNAT.Sockets.Thin)
40
41--------------------------
42-- Socket_Error_Message --
43--------------------------
44
45function Socket_Error_Message
46  (Errno : Integer) return C.Strings.chars_ptr
47is
48   use type Interfaces.C.Strings.chars_ptr;
49   C_Msg : constant C.Strings.chars_ptr :=
50             System.CRTL.Runtime.strerror (Errno);
51
52begin
53   if C_Msg = C.Strings.Null_Ptr then
54      return Unknown_System_Error;
55   else
56      return C_Msg;
57   end if;
58end Socket_Error_Message;
59