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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- S Y S T E M . C R T L --
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6 -- --
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7 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 2003-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT 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 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package provides the low level interface to the C runtime library
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33
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34 pragma Compiler_Unit_Warning;
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35
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36 with System.Parameters;
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37
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38 package System.CRTL is
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39 pragma Preelaborate;
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40
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41 subtype chars is System.Address;
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42 -- Pointer to null-terminated array of characters
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43 -- Should use Interfaces.C.Strings types instead, but this causes bootstrap
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44 -- issues as i-c contains Ada 2005 specific features, not compatible with
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45 -- older, Ada 95-only base compilers???
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46
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47 subtype DIRs is System.Address;
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48 -- Corresponds to the C type DIR*
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49
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50 subtype FILEs is System.Address;
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51 -- Corresponds to the C type FILE*
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52
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53 subtype int is Integer;
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54
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55 type long is range -(2 ** (System.Parameters.long_bits - 1))
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56 .. +(2 ** (System.Parameters.long_bits - 1)) - 1;
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57
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58 subtype off_t is Long_Integer;
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59
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60 type size_t is mod 2 ** Standard'Address_Size;
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61
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62 type ssize_t is range -(2 ** (Standard'Address_Size - 1))
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63 .. +(2 ** (Standard'Address_Size - 1)) - 1;
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64
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65 type int64 is new Long_Long_Integer;
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66 -- Note: we use Long_Long_Integer'First instead of -2 ** 63 to allow this
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67 -- unit to compile when using custom target configuration files where the
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68 -- maximum integer is 32 bits. This is useful for static analysis tools
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69 -- such as SPARK or CodePeer. In the normal case, Long_Long_Integer is
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70 -- always 64-bits so there is no difference.
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71
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72 type Filename_Encoding is (UTF8, ASCII_8bits, Unspecified);
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73 for Filename_Encoding use (UTF8 => 0, ASCII_8bits => 1, Unspecified => 2);
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74 pragma Convention (C, Filename_Encoding);
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75 -- Describes the filename's encoding
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76
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77 --------------------
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78 -- GCC intrinsics --
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79 --------------------
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80
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81 -- The following functions are imported with convention Intrinsic so that
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82 -- we take advantage of back-end builtins if present (else we fall back
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83 -- to C library functions by the same names).
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84
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85 function strlen (A : System.Address) return size_t;
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86 pragma Import (Intrinsic, strlen, "strlen");
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87
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88 procedure strncpy (dest, src : System.Address; n : size_t);
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89 pragma Import (Intrinsic, strncpy, "strncpy");
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90
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91 -------------------------------
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92 -- Other C runtime functions --
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93 -------------------------------
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94
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95 function atoi (A : System.Address) return Integer;
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96 pragma Import (C, atoi, "atoi");
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97
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98 procedure clearerr (stream : FILEs);
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99 pragma Import (C, clearerr, "clearerr");
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100
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101 function dup (handle : int) return int;
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102 pragma Import (C, dup, "dup");
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103
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104 function dup2 (from, to : int) return int;
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105 pragma Import (C, dup2, "dup2");
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106
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107 function fclose (stream : FILEs) return int;
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108 pragma Import (C, fclose, "fclose");
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109
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110 function fdopen (handle : int; mode : chars) return FILEs;
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111 pragma Import (C, fdopen, "fdopen");
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112
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113 function fflush (stream : FILEs) return int;
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114 pragma Import (C, fflush, "fflush");
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115
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116 function fgetc (stream : FILEs) return int;
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117 pragma Import (C, fgetc, "fgetc");
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118
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119 function fgets (strng : chars; n : int; stream : FILEs) return chars;
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120 pragma Import (C, fgets, "fgets");
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121
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122 function fopen
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123 (filename : chars;
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124 mode : chars;
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125 encoding : Filename_Encoding := Unspecified) return FILEs;
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126 pragma Import (C, fopen, "__gnat_fopen");
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127
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128 function fputc (C : int; stream : FILEs) return int;
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129 pragma Import (C, fputc, "fputc");
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130
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131 function fputwc (C : int; stream : FILEs) return int;
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132 pragma Import (C, fputwc, "__gnat_fputwc");
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133
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134 function fputs (Strng : chars; Stream : FILEs) return int;
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135 pragma Import (C, fputs, "fputs");
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136
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137 procedure free (Ptr : System.Address);
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138 pragma Import (C, free, "free");
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139
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140 function freopen
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141 (filename : chars;
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142 mode : chars;
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143 stream : FILEs;
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144 encoding : Filename_Encoding := Unspecified) return FILEs;
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145 pragma Import (C, freopen, "__gnat_freopen");
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146
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147 function fseek
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148 (stream : FILEs;
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149 offset : long;
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150 origin : int) return int;
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151 pragma Import (C, fseek, "fseek");
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152
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153 function fseek64
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154 (stream : FILEs;
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155 offset : int64;
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156 origin : int) return int;
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157 pragma Import (C, fseek64, "__gnat_fseek64");
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158
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159 function ftell (stream : FILEs) return long;
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160 pragma Import (C, ftell, "ftell");
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161
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162 function ftell64 (stream : FILEs) return int64;
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163 pragma Import (C, ftell64, "__gnat_ftell64");
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164
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165 function getenv (S : String) return System.Address;
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166 pragma Import (C, getenv, "getenv");
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167
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168 function isatty (handle : int) return int;
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169 pragma Import (C, isatty, "isatty");
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170
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171 function lseek (fd : int; offset : off_t; direction : int) return off_t;
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172 pragma Import (C, lseek, "lseek");
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173
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174 function malloc (Size : size_t) return System.Address;
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175 pragma Import (C, malloc, "malloc");
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176
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177 procedure memcpy (S1 : System.Address; S2 : System.Address; N : size_t);
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178 pragma Import (C, memcpy, "memcpy");
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179
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180 procedure memmove (S1 : System.Address; S2 : System.Address; N : size_t);
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181 pragma Import (C, memmove, "memmove");
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182
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183 procedure mktemp (template : chars);
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184 pragma Import (C, mktemp, "mktemp");
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185
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186 function pclose (stream : System.Address) return int;
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187 pragma Import (C, pclose, "pclose");
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188
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189 function popen (command, mode : System.Address) return System.Address;
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190 pragma Import (C, popen, "popen");
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191
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192 function realloc
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193 (Ptr : System.Address; Size : size_t) return System.Address;
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194 pragma Import (C, realloc, "realloc");
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195
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196 procedure rewind (stream : FILEs);
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197 pragma Import (C, rewind, "rewind");
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198
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199 function rmdir (dir_name : String) return int;
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200 pragma Import (C, rmdir, "__gnat_rmdir");
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201
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202 function chdir (dir_name : String) return int;
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203 pragma Import (C, chdir, "__gnat_chdir");
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204
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205 function mkdir
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206 (dir_name : String;
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207 encoding : Filename_Encoding := Unspecified) return int;
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208 pragma Import (C, mkdir, "__gnat_mkdir");
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209
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210 function setvbuf
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211 (stream : FILEs;
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212 buffer : chars;
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213 mode : int;
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214 size : size_t) return int;
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215 pragma Import (C, setvbuf, "setvbuf");
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216
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217 procedure tmpnam (str : chars);
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218 pragma Import (C, tmpnam, "tmpnam");
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219
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220 function tmpfile return FILEs;
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221 pragma Import (C, tmpfile, "tmpfile");
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222
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223 function ungetc (c : int; stream : FILEs) return int;
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224 pragma Import (C, ungetc, "ungetc");
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225
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226 function unlink (filename : chars) return int;
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227 pragma Import (C, unlink, "__gnat_unlink");
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228
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229 function open (filename : chars; oflag : int) return int;
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230 pragma Import (C, open, "__gnat_open");
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231
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232 function close (fd : int) return int;
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233 pragma Import (C, close, "close");
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234
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235 function read (fd : int; buffer : chars; count : size_t) return ssize_t;
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236 pragma Import (C, read, "read");
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237
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238 function write (fd : int; buffer : chars; count : size_t) return ssize_t;
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239 pragma Import (C, write, "write");
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240
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241 end System.CRTL;
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