1 ------------------------------------------------------------------------------
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . O S _ I N T E R F A C E --
10 -- Copyright (C) 1991-2000 Florida State University --
12 -- GNARL 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 2, or (at your option) any later ver- --
15 -- sion. GNARL 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. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNARL; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNARL was developed by the GNARL team at Florida State University. It is --
31 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
32 -- State University (http://www.gnat.com). --
34 -- The GNARL files that were developed for RTEMS are maintained by On-Line --
35 -- Applications Research Corporation (http://www.oarcorp.com) in coopera- --
36 -- tion with Ada Core Technologies Inc. and Florida State University. --
38 ------------------------------------------------------------------------------
40 -- This is the RTEMS version of this package
42 -- This package encapsulates all direct interfaces to OS services
43 -- that are needed by children of System.
46 -- Turn off polling, we do not want ATC polling to take place during
47 -- tasking operations. It causes infinite loops and other problems.
49 with Interfaces.C; use Interfaces.C;
50 package body System.OS_Interface is
56 function To_Duration (TS : timespec) return Duration is
58 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
65 function To_Timespec (D : Duration) return timespec is
69 S := time_t (Long_Long_Integer (D));
70 F := D - Duration (S);
72 -- If F has negative value due to a round-up, adjust for positive F
74 if F < 0.0 then S := S - 1; F := F + 1.0; end if;
75 return timespec' (tv_sec => S,
76 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
80 function To_Duration (TV : struct_timeval) return Duration is
82 return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
85 function To_Timeval (D : Duration) return struct_timeval is
89 S := int (Long_Long_Integer (D));
90 F := D - Duration (S);
92 -- If F has negative value due to a round-up, adjust for positive F
94 if F < 0.0 then S := S - 1; F := F + 1.0; end if;
95 return struct_timeval' (tv_sec => S,
96 tv_usec => int (Long_Long_Integer (F * 10#1#E6)));
99 procedure pthread_init is
104 function Get_Stack_Base (thread : pthread_t) return Address is
109 function Get_Page_Size return size_t is
114 function Get_Page_Size return Address is
120 (addr : Address; len : size_t; prot : int) return int is
125 end System.OS_Interface;