1------------------------------------------------------------------------------
2--                                                                          --
3--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
4--                                                                          --
5--                   S Y S T E M . O S _ I N T E R F A C E                  --
6--                                                                          --
7--                                   B o d y                                --
8--                                                                          --
9--                     Copyright (C) 1995-2019, 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-- GNARL was developed by the GNARL team at Florida State University.       --
28-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
29--                                                                          --
30------------------------------------------------------------------------------
31
32--  This is an Android version of this package.
33
34pragma Polling (Off);
35--  Turn off polling, we do not want ATC polling to take place during
36--  tasking operations. It causes infinite loops and other problems.
37
38--  This package encapsulates all direct interfaces to OS services
39--  that are needed by children of System.
40
41with Interfaces.C;            use Interfaces.C;
42
43package body System.OS_Interface is
44
45   -----------------
46   -- To_Duration --
47   -----------------
48
49   function To_Duration (TS : timespec) return Duration is
50   begin
51      return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
52   end To_Duration;
53
54   -----------------
55   -- To_Timespec --
56   -----------------
57
58   function To_Timespec (D : Duration) return timespec is
59      S : time_t;
60      F : Duration;
61
62   begin
63      S := time_t (Long_Long_Integer (D));
64      F := D - Duration (S);
65
66      --  If F has negative value due to a round-up, adjust for positive F
67      --  value.
68
69      if F < 0.0 then
70         S := S - 1;
71         F := F + 1.0;
72      end if;
73
74      return timespec'(tv_sec => S,
75                       tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
76   end To_Timespec;
77
78end System.OS_Interface;
79