gcc/ada/s-osinte-freebsd.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) 1991-2005 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 2,  or (at your option) any later ver- --
  14 -- sion. GNARL 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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNARL was developed by the GNARL team at Florida State University. It is --
  30 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  31 -- State University (http://www.gnat.com).                                  --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 --  This is the FreeBSD THREADS version of this package
  36
  37 with Interfaces.C; use Interfaces.C;
  38
  39 package body System.OS_Interface is
  40
  41    function Errno return int is
  42       type int_ptr is access all int;
  43
  44       function internal_errno return int_ptr;
  45       pragma Import (C, internal_errno, "__error");
  46    begin
  47       return (internal_errno.all);
  48    end Errno;
  49
  50    function Get_Stack_Base (thread : pthread_t) return Address is
  51       pragma Unreferenced (thread);
  52    begin
  53       return (0);
  54    end Get_Stack_Base;
  55
  56    procedure pthread_init is
  57    begin
  58       null;
  59    end pthread_init;
  60
  61    -----------------
  62    -- To_Duration --
  63    -----------------
  64
  65    function To_Duration (TS : timespec) return Duration is
  66    begin
  67       return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
  68    end To_Duration;
  69
  70    -----------------
  71    -- To_Timespec --
  72    -----------------
  73
  74    function To_Timespec (D : Duration) return timespec is
  75       S : time_t;
  76       F : Duration;
  77    begin
  78       S := time_t (Long_Long_Integer (D));
  79       F := D - Duration (S);
  80
  81       --  If F has negative value due to a round-up, adjust for positive F
  82       --  value.
  83       if F < 0.0 then S := S - 1; F := F + 1.0; end if;
  84       return timespec'(ts_sec => S,
  85         ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
  86    end To_Timespec;
  87
  88    function To_Duration (TV : struct_timeval) return Duration is
  89    begin
  90       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
  91    end To_Duration;
  92
  93    function To_Timeval (D : Duration) return struct_timeval is
  94       S : long;
  95       F : Duration;
  96    begin
  97       S := long (Long_Long_Integer (D));
  98       F := D - Duration (S);
  99
 100       --  If F has negative value due to a round-up, adjust for positive F
 101       --  value.
 102       if F < 0.0 then S := S - 1; F := F + 1.0; end if;
 103       return struct_timeval'(tv_sec => S,
 104         tv_usec => long (Long_Long_Integer (F * 10#1#E6)));
 105    end To_Timeval;
 106
 107 end System.OS_Interface;