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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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4 -- --
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5 -- S Y S T E M . O S _ I N T E R F A C E --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 1995-2018, AdaCore --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNARL was developed by the GNARL team at Florida State University. --
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28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This is an Android version of this package.
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33
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34 pragma Polling (Off);
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35 -- Turn off polling, we do not want ATC polling to take place during
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36 -- tasking operations. It causes infinite loops and other problems.
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37
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38 -- This package encapsulates all direct interfaces to OS services
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39 -- that are needed by children of System.
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40
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41 with Interfaces.C; use Interfaces.C;
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42
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43 package body System.OS_Interface is
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44
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45 -----------------
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46 -- To_Duration --
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47 -----------------
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48
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49 function To_Duration (TS : timespec) return Duration is
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50 begin
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51 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
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52 end To_Duration;
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53
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54 -----------------
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55 -- To_Timespec --
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56 -----------------
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57
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58 function To_Timespec (D : Duration) return timespec is
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59 S : time_t;
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60 F : Duration;
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61
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62 begin
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63 S := time_t (Long_Long_Integer (D));
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64 F := D - Duration (S);
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65
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66 -- If F has negative value due to a round-up, adjust for positive F
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67 -- value.
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68
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69 if F < 0.0 then
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70 S := S - 1;
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71 F := F + 1.0;
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72 end if;
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73
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74 return timespec'(tv_sec => S,
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75 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
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76 end To_Timespec;
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77
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78 end System.OS_Interface;
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