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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                    G N A T . S O C K E T S . T H I N                     --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--                     Copyright (C) 2002-2009, 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 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 Alpha/VMS version

with Interfaces.C.Strings;

with GNAT.OS_Lib;

with GNAT.Sockets.Thin_Common;

with System;

package GNAT.Sockets.Thin is

   --  ??? more comments needed ???

   use Thin_Common;

   package C renames Interfaces.C;

   use type C.size_t;

   type ssize_t is range -(2 ** (C.size_t'Size - 1))

     .. +(2 ** (C.size_t'Size - 1) - 1);

   --  Signed type of the same size as size_t

   function Socket_Errno return Integer renames GNAT.OS_Lib.Errno;

   --  Returns last socket error number

   procedure Set_Socket_Errno (Errno : Integer) renames GNAT.OS_Lib.Set_Errno;

   --  Set last socket error number

   function Socket_Error_Message (Errno : Integer) return C.Strings.chars_ptr;

   --  Returns the error message string for the error number Errno. If Errno is

   --  not known, returns "Unknown system error".

   function Host_Errno return Integer;

   pragma Import (C, Host_Errno, "__gnat_get_h_errno");

   --  Returns last host error number

   package Host_Error_Messages is

      function Host_Error_Message

        (H_Errno : Integer) return C.Strings.chars_ptr;

      --  Returns the error message string for the host error number H_Errno.

      --  If H_Errno is not known, returns "Unknown system error".

   end Host_Error_Messages;

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

   -- Standard library functions --

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

   function C_Accept

     (S       : C.int;

      Addr    : System.Address;

      Addrlen : not null access C.int) return C.int;

   function C_Bind

     (S       : C.int;

      Name    : System.Address;

      Namelen : C.int) return C.int;

   function C_Close

     (Fd : C.int) return C.int;

   function C_Connect

     (S       : C.int;

      Name    : System.Address;

      Namelen : C.int) return C.int;

   function C_Gethostname

     (Name    : System.Address;

      Namelen : C.int) return C.int;

   function C_Getpeername

     (S       : C.int;

      Name    : System.Address;

      Namelen : not null access C.int) return C.int;

   function C_Getsockname

     (S       : C.int;

      Name    : System.Address;

      Namelen : not null access C.int) return C.int;

   function C_Getsockopt

     (S       : C.int;

      Level   : C.int;

      Optname : C.int;

      Optval  : System.Address;

      Optlen  : not null access C.int) return C.int;

   function Socket_Ioctl

     (S   : C.int;

      Req : C.int;

      Arg : access C.int) return C.int;

   function C_Listen

     (S       : C.int;

      Backlog : C.int) return C.int;

   function C_Recv

     (S     : C.int;

      Msg   : System.Address;

      Len   : C.int;

      Flags : C.int) return C.int;

   function C_Recvfrom

     (S       : C.int;

      Msg     : System.Address;

      Len     : C.int;

      Flags   : C.int;

      From    : System.Address;

      Fromlen : not null access C.int) return C.int;

   function C_Recvmsg

     (S     : C.int;

      Msg   : System.Address;

      Flags : C.int) return ssize_t;

   function C_Select

     (Nfds      : C.int;

      Readfds   : access Fd_Set;

      Writefds  : access Fd_Set;

      Exceptfds : access Fd_Set;

      Timeout   : Timeval_Access) return C.int;

   function C_Sendmsg

     (S     : C.int;

      Msg   : System.Address;

      Flags : C.int) return ssize_t;

   function C_Sendto

     (S     : C.int;

      Msg   : System.Address;

      Len   : C.int;

      Flags : C.int;

      To    : System.Address;

      Tolen : C.int) return C.int;

   function C_Setsockopt

     (S       : C.int;

      Level   : C.int;

      Optname : C.int;

      Optval  : System.Address;

      Optlen  : C.int) return C.int;

   function C_Shutdown

     (S   : C.int;

      How : C.int) return C.int;

   function C_Socket

     (Domain   : C.int;

      Typ      : C.int;

      Protocol : C.int) return C.int;

   function C_System

     (Command : System.Address) return C.int;

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

   -- Signalling file descriptors for selector abortion --

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

   package Signalling_Fds is

      function Create (Fds : not null access Fd_Pair) return C.int;

      pragma Convention (C, Create);

      --  Create a pair of connected descriptors suitable for use with C_Select

      --  (used for signalling in Selector objects).

      function Read (Rsig : C.int) return C.int;

      pragma Convention (C, Read);

      --  Read one byte of data from rsig, the read end of a pair of signalling

      --  fds created by Create_Signalling_Fds.

      function Write (Wsig : C.int) return C.int;

      pragma Convention (C, Write);

      --  Write one byte of data to wsig, the write end of a pair of signalling

      --  fds created by Create_Signalling_Fds.

      procedure Close (Sig : C.int);

      pragma Convention (C, Close);

      --  Close one end of a pair of signalling fds (ignoring any error)

   end Signalling_Fds;

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

   -- Nonreentrant network databases access --

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

   function Nonreentrant_Gethostbyname

     (Name : C.char_array) return Hostent_Access;

   function Nonreentrant_Gethostbyaddr

     (Addr      : System.Address;

      Addr_Len  : C.int;

      Addr_Type : C.int) return Hostent_Access;

   function Nonreentrant_Getservbyname

     (Name  : C.char_array;

      Proto : C.char_array) return Servent_Access;

   function Nonreentrant_Getservbyport

     (Port  : C.int;

      Proto : C.char_array) return Servent_Access;

   procedure Initialize;

   procedure Finalize;

private

   pragma Import (C, C_Bind,          "DECC$BIND");

   pragma Import (C, C_Close,         "DECC$CLOSE");

   pragma Import (C, C_Gethostname,   "DECC$GETHOSTNAME");

   pragma Import (C, C_Getpeername,   "DECC$GETPEERNAME");

   pragma Import (C, C_Getsockname,   "DECC$GETSOCKNAME");

   pragma Import (C, C_Getsockopt,    "DECC$GETSOCKOPT");

   pragma Import (C, C_Listen,        "DECC$LISTEN");

   pragma Import (C, C_Select,        "DECC$SELECT");

   pragma Import (C, C_Setsockopt,    "DECC$SETSOCKOPT");

   pragma Import (C, C_Shutdown,      "DECC$SHUTDOWN");

   pragma Import (C, C_System,        "DECC$SYSTEM");

   pragma Import (C, Nonreentrant_Gethostbyname, "DECC$GETHOSTBYNAME");

   pragma Import (C, Nonreentrant_Gethostbyaddr, "DECC$GETHOSTBYADDR");

   pragma Import (C, Nonreentrant_Getservbyname, "DECC$GETSERVBYNAME");

   pragma Import (C, Nonreentrant_Getservbyport, "DECC$GETSERVBYPORT");

end GNAT.Sockets.Thin;