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) 1991-2019, Free Software Foundation, Inc.         --
10--                                                                          --
11-- GNARL 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. It is --
28-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
29-- State University (http://www.gnat.com).                                  --
30--                                                                          --
31------------------------------------------------------------------------------
32
33--  This is the FreeBSD THREADS version of this package
34
35with Interfaces.C; use Interfaces.C;
36
37package body System.OS_Interface is
38
39   -----------
40   -- Errno --
41   -----------
42
43   function Errno return int is
44      type int_ptr is access all int;
45
46      function internal_errno return int_ptr;
47      pragma Import (C, internal_errno, "__get_errno");
48
49   begin
50      return (internal_errno.all);
51   end Errno;
52
53   --------------------
54   -- Get_Stack_Base --
55   --------------------
56
57   function Get_Stack_Base (thread : pthread_t) return Address is
58      pragma Unreferenced (thread);
59   begin
60      return Null_Address;
61   end Get_Stack_Base;
62
63   ------------------
64   -- pthread_init --
65   ------------------
66
67   procedure pthread_init is
68   begin
69      null;
70   end pthread_init;
71
72   -----------------
73   -- To_Duration --
74   -----------------
75
76   function To_Duration (TS : timespec) return Duration is
77   begin
78      return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
79   end To_Duration;
80
81   ------------------------
82   -- To_Target_Priority --
83   ------------------------
84
85   function To_Target_Priority
86     (Prio : System.Any_Priority) return Interfaces.C.int
87   is
88   begin
89      return Interfaces.C.int (Prio);
90   end To_Target_Priority;
91
92   -----------------
93   -- To_Timespec --
94   -----------------
95
96   function To_Timespec (D : Duration) return timespec is
97      S : time_t;
98      F : Duration;
99
100   begin
101      S := time_t (Long_Long_Integer (D));
102      F := D - Duration (S);
103
104      --  If F has negative value due to a round-up, adjust for positive F
105
106      if F < 0.0 then
107         S := S - 1;
108         F := F + 1.0;
109      end if;
110
111      return timespec'(ts_sec => S,
112                       ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
113   end To_Timespec;
114
115end System.OS_Interface;
116