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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;