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+------------------------------------------------------------------------------
+-- --
+-- GNAT 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) 1991-2009, Free Software Foundation, Inc. --
+-- --
+-- 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 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/>. --
+-- --
+-- 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). --
+-- --
+------------------------------------------------------------------------------
+
+-- This is the FreeBSD THREADS version of this package
+
+with Interfaces.C; use Interfaces.C;
+
+package body System.OS_Interface is
+
+ -----------
+ -- Errno --
+ -----------
+
+ function Errno return int is
+ type int_ptr is access all int;
+
+ function internal_errno return int_ptr;
+ pragma Import (C, internal_errno, "__error");
+
+ begin
+ return (internal_errno.all);
+ end Errno;
+
+ --------------------
+ -- Get_Stack_Base --
+ --------------------
+
+ function Get_Stack_Base (thread : pthread_t) return Address is
+ pragma Unreferenced (thread);
+ begin
+ return (0);
+ end Get_Stack_Base;
+
+ ------------------
+ -- pthread_init --
+ ------------------
+
+ procedure pthread_init is
+ begin
+ null;
+ end pthread_init;
+
+ -----------------
+ -- To_Duration --
+ -----------------
+
+ function To_Duration (TS : timespec) return Duration is
+ begin
+ return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
+ end To_Duration;
+
+ ------------------------
+ -- To_Target_Priority --
+ ------------------------
+
+ function To_Target_Priority
+ (Prio : System.Any_Priority) return Interfaces.C.int
+ is
+ begin
+ return Interfaces.C.int (Prio);
+ end To_Target_Priority;
+
+ -----------------
+ -- 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 a round-up, adjust for positive F
+
+ if F < 0.0 then
+ S := S - 1;
+ F := F + 1.0;
+ end if;
+
+ return timespec'(ts_sec => S,
+ ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
+ end To_Timespec;
+
+end System.OS_Interface;