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

--                                                                          --

--                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --

--                                                                          --

--                   S Y S T E M . O S _ I N T E R F A C E                  --

--                                                                          --

--                                  B o d y                                 --

--                                                                          --

--            Copyright (C) 1991-2002 Florida State University              --

--                                                                          --

-- GNARL 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. GNARL 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 GNARL; 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.                                      --

--                                                                          --

-- GNARL was developed by the GNARL team at Florida State University. It is --

-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --

-- State University (http://www.gnat.com).                                  --

--                                                                          --

-- The GNARL files that were developed for RTEMS are maintained by  On-Line --

-- Applications Research Corporation (http://www.oarcorp.com)  in  coopera- --

-- tion with Ada Core Technologies Inc. and Florida State University.       --

--                                                                          --

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

--  This is the RTEMS version of this package

--  This package encapsulates all direct interfaces to OS services

--  that are needed by children of System.

pragma Polling (Off);

--  Turn off polling, we do not want ATC polling to take place during

--  tasking operations. It causes infinite loops and other problems.

with Interfaces.C; use Interfaces.C;

package body System.OS_Interface is

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

   -- To_Duration --

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

   function To_Duration (TS : timespec) return Duration is

   begin

      return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;

   end To_Duration;

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

   -- To_Timespec --

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

   function To_Timespec (D : Duration) return timespec is

      S : time_t;

      F : Duration;

   begin

      S := time_t (Long_Long_Integer (D));

      F := D - Duration (S);

      --  If F has negative value due to round-up, adjust for positive F value

      if F < 0.0 then S := S - 1; F := F + 1.0; end if;

      return timespec'(tv_sec => S,

                       tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));

   end To_Timespec;

   function To_Duration (TV : struct_timeval) return Duration is

   begin

      return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;

   end To_Duration;

   function To_Timeval (D : Duration) return struct_timeval is

      S : int;

      F : Duration;

   begin

      S := int (Long_Long_Integer (D));

      F := D - Duration (S);

      --  If F has negative value due to a round-up, adjust for positive F

      --  value.

      if F < 0.0 then S := S - 1; F := F + 1.0; end if;

      return

        struct_timeval'

          (tv_sec  => S,

           tv_usec => int (Long_Long_Integer (F * 10#1#E6)));

   end To_Timeval;

   procedure pthread_init is

   begin

      null;

   end pthread_init;

   function Get_Stack_Base (thread : pthread_t) return Address is

      pragma Warnings (Off, thread);

   begin

      return Null_Address;

   end Get_Stack_Base;

   function Get_Page_Size return size_t is

   begin

      return 0;

   end Get_Page_Size;

   function Get_Page_Size return Address is

   begin

      return 0;

   end Get_Page_Size;

end System.OS_Interface;