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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) 1991-2015, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNARL 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. It is --
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28 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
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29 -- State University (http://www.gnat.com). --
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30 -- --
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31 ------------------------------------------------------------------------------
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32
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33 -- This is the DragonFly THREADS version of this package
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34
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35 with Interfaces.C; use Interfaces.C;
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36
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37 package body System.OS_Interface is
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38
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39 -----------
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40 -- Errno --
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41 -----------
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42
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43 function Errno return int is
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44 type int_ptr is access all int;
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45
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46 function internal_errno return int_ptr;
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47 pragma Import (C, internal_errno, "__get_errno");
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48
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49 begin
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50 return (internal_errno.all);
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51 end Errno;
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52
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53 --------------------
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54 -- Get_Stack_Base --
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55 --------------------
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56
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57 function Get_Stack_Base (thread : pthread_t) return Address is
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58 pragma Unreferenced (thread);
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59 begin
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60 return Null_Address;
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61 end Get_Stack_Base;
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62
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63 ------------------
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64 -- pthread_init --
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65 ------------------
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66
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67 procedure pthread_init is
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68 begin
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69 null;
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70 end pthread_init;
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71
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72 -----------------
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73 -- To_Duration --
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74 -----------------
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75
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76 function To_Duration (TS : timespec) return Duration is
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77 begin
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78 return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
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79 end To_Duration;
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80
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81 ------------------------
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82 -- To_Target_Priority --
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83 ------------------------
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84
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85 function To_Target_Priority
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86 (Prio : System.Any_Priority) return Interfaces.C.int
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87 is
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88 begin
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89 return Interfaces.C.int (Prio);
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90 end To_Target_Priority;
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91
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92 -----------------
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93 -- To_Timespec --
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94 -----------------
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95
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96 function To_Timespec (D : Duration) return timespec is
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97 S : time_t;
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98 F : Duration;
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99
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100 begin
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101 S := time_t (Long_Long_Integer (D));
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102 F := D - Duration (S);
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103
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104 -- If F has negative value due to a round-up, adjust for positive F
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105 -- value.
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106
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107 if F < 0.0 then
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108 S := S - 1;
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109 F := F + 1.0;
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110 end if;
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111
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112 return timespec'(ts_sec => S,
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113 ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
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114 end To_Timespec;
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115
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116 end System.OS_Interface;
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