gcc/ada/libgnarl/s-osinte__qnx.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) 1991-2017, Florida State University            --
  10 --                     Copyright (C) 1995-2023, AdaCore                     --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  18 --                                                                          --
  19 -- As a special exception under Section 7 of GPL version 3, you are granted --
  20 -- additional permissions described in the GCC Runtime Library Exception,   --
  21 -- version 3.1, as published by the Free Software Foundation.               --
  22 --                                                                          --
  23 -- You should have received a copy of the GNU General Public License and    --
  24 -- a copy of the GCC Runtime Library Exception along with this program;     --
  25 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  26 -- <http://www.gnu.org/licenses/>.                                          --
  27 --                                                                          --
  28 -- GNARL was developed by the GNARL team at Florida State University.       --
  29 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  30 --                                                                          --
  31 ------------------------------------------------------------------------------
  32
  33 --  This version is for QNX operating systems
  34
  35 --  This package encapsulates all direct interfaces to OS services
  36 --  that are needed by children of System.
  37
  38 with Interfaces.C; use Interfaces.C;
  39 package body System.OS_Interface is
  40
  41    -----------------
  42    -- sigaltstack --
  43    -----------------
  44
  45    function sigaltstack
  46      (ss  : not null access stack_t;
  47       oss : access stack_t) return int
  48    is
  49       pragma Unreferenced (ss, oss);
  50    begin
  51       return 0;
  52    end sigaltstack;
  53
  54    --------------------
  55    -- Get_Stack_Base --
  56    --------------------
  57
  58    function Get_Stack_Base (thread : pthread_t) return Address is
  59       pragma Unreferenced (thread);
  60    begin
  61       return Null_Address;
  62    end Get_Stack_Base;
  63
  64    ------------------
  65    -- pthread_init --
  66    ------------------
  67
  68    procedure pthread_init is
  69    begin
  70       null;
  71    end pthread_init;
  72
  73    -----------------
  74    -- To_Duration --
  75    -----------------
  76
  77    function To_Duration (TS : timespec) return Duration is
  78    begin
  79       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  80    end To_Duration;
  81
  82    ------------------------
  83    -- To_Target_Priority --
  84    ------------------------
  85
  86    function To_Target_Priority
  87      (Prio : System.Any_Priority) return Interfaces.C.int
  88    is
  89    begin
  90       return Interfaces.C.int (Prio);
  91    end To_Target_Priority;
  92
  93    -----------------
  94    -- To_Timespec --
  95    -----------------
  96
  97    function To_Timespec (D : Duration) return timespec is
  98       S : time_t;
  99       F : Duration;
 100
 101    begin
 102       S := time_t (Long_Long_Integer (D));
 103       F := D - Duration (S);
 104
 105       --  If F has negative value due to a round-up, adjust for positive F
 106       --  value.
 107
 108       if F < 0.0 then
 109          S := S - 1;
 110          F := F + 1.0;
 111       end if;
 112
 113       return timespec'(tv_sec => S,
 114                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 115    end To_Timespec;
 116
 117 end System.OS_Interface;