gcc/ada/libgnarl/s-osinte__android.adb

   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) 1995-2024, 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
  34 --  This package encapsulates all direct interfaces to OS services
  35 --  that are needed by children of System.
  36
  37 with Interfaces.C;            use Interfaces.C;
  38
  39 package body System.OS_Interface is
  40
  41    -----------------
  42    -- To_Duration --
  43    -----------------
  44
  45    function To_Duration (TS : timespec) return Duration is
  46    begin
  47       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  48    end To_Duration;
  49
  50    -----------------
  51    -- To_Timespec --
  52    -----------------
  53
  54    function To_Timespec (D : Duration) return timespec is
  55       S : time_t;
  56       F : Duration;
  57
  58    begin
  59       S := time_t (Long_Long_Integer (D));
  60       F := D - Duration (S);
  61
  62       --  If F has negative value due to a round-up, adjust for positive F
  63       --  value.
  64
  65       if F < 0.0 then
  66          S := S - 1;
  67          F := F + 1.0;
  68       end if;
  69
  70       return timespec'(tv_sec => S,
  71                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
  72    end To_Timespec;
  73
  74 end System.OS_Interface;