mcs/class/corlib/System/Environment.cs

   1 //------------------------------------------------------------------------------
   2 //
   3 // System.Environment.cs
   4 //
   5 // Copyright (C) 2001 Moonlight Enterprises, All Rights Reserved
   6 //
   7 // Author:         Jim Richardson, develop@wtfo-guru.com
   8 //                 Dan Lewis (dihlewis@yahoo.co.uk)
   9 // Created:        Saturday, August 11, 2001
  10 //
  11 //------------------------------------------------------------------------------
  12 //
  13 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 using System.IO;
  36 using System.Collections;
  37 using System.Runtime.CompilerServices;
  38 using System.Security;
  39 using System.Security.Permissions;
  40 using System.Text;
  41
  42 namespace System {
  43
  44 #if NET_2_0
  45         public static class Environment {
  46 #else
  47         public sealed class Environment {
  48
  49                 private Environment ()
  50                 {
  51                 }
  52 #endif
  53                 /*
  54                  * This is the version number of the corlib-runtime interface. When
  55                  * making changes to this interface (by changing the layout
  56                  * of classes the runtime knows about, changing icall signature or
  57                  * semantics etc), increment this variable. Also increment the
  58                  * pair of this variable in the runtime in metadata/appdomain.c.
  59                  * Changes which are already detected at runtime, like the addition
  60                  * of icalls, do not require an increment.
  61                  */
  62                 private const int mono_corlib_version = 53;
  63
  64                 [MonoTODO]
  65                 public enum SpecialFolder
  66                 {       // TODO: Determine if these windoze style folder identifiers
  67                         //       have unix/linux counterparts
  68 #if NET_2_0
  69                         MyDocuments = 0x05,
  70 #endif
  71 #if NET_1_1
  72                         Desktop = 0x00,
  73                         MyComputer = 0x11,
  74 #endif
  75                         Programs = 0x02,
  76                         Personal = 0x05,
  77                         Favorites = 0x06,
  78                         Startup = 0x07,
  79                         Recent = 0x08,
  80                         SendTo = 0x09,
  81                         StartMenu = 0x0b,
  82                         MyMusic = 0x0d,
  83                         DesktopDirectory = 0x10,
  84                         Templates = 0x15,
  85                         ApplicationData = 0x1a,
  86                         LocalApplicationData = 0x1c,
  87                         InternetCache = 0x20,
  88                         Cookies = 0x21,
  89                         History = 0x22,
  90                         CommonApplicationData   = 0x23,
  91                         System = 0x25,
  92                         ProgramFiles = 0x26,
  93                         MyPictures = 0x27,
  94                         CommonProgramFiles = 0x2b,
  95                 }
  96
  97                 /// <summary>
  98                 /// Gets the command line for this process
  99                 /// </summary>
 100                 public static string CommandLine {
 101                         // note: security demand inherited from calling GetCommandLineArgs
 102                         get {
 103                                 // FIXME: we may need to quote, but any sane person
 104                                 // should use GetCommandLineArgs () instead.
 105                                 return String.Join (" ", GetCommandLineArgs ());
 106                         }
 107                 }
 108
 109                 /// <summary>
 110                 /// Gets or sets the current directory. Actually this is supposed to get
 111                 /// and/or set the process start directory acording to the documentation
 112                 /// but actually test revealed at beta2 it is just Getting/Setting the CurrentDirectory
 113                 /// </summary>
 114                 public static string CurrentDirectory
 115                 {
 116                         get {
 117                                 return Directory.GetCurrentDirectory ();
 118                         }
 119                         set {
 120                                 Directory.SetCurrentDirectory (value);
 121                         }
 122                 }
 123
 124                 /// <summary>
 125                 /// Gets or sets the exit code of this process
 126                 /// </summary>
 127                 public extern static int ExitCode
 128                 {
 129                         [MethodImplAttribute (MethodImplOptions.InternalCall)]
 130                         get;
 131                         [MethodImplAttribute (MethodImplOptions.InternalCall)]
 132                         set;
 133                 }
 134
 135 #if NET_1_1
 136                 static
 137 #endif
 138                 public extern bool HasShutdownStarted
 139                 {
 140                         [MethodImplAttribute (MethodImplOptions.InternalCall)]
 141                         get;
 142                 }
 143
 144
 145                 /// <summary>
 146                 /// Gets the name of the local computer
 147                 /// </summary>
 148                 public extern static string MachineName {
 149                         [MethodImplAttribute (MethodImplOptions.InternalCall)]
 150                         [EnvironmentPermission (SecurityAction.Demand, Read="COMPUTERNAME")]
 151                         [SecurityPermission (SecurityAction.Demand, UnmanagedCode=true)]
 152                         get;
 153                 }
 154
 155                 /// <summary>
 156                 /// Gets the standard new line value
 157                 /// </summary>
 158                 public extern static string NewLine {
 159                         [MethodImplAttribute (MethodImplOptions.InternalCall)]
 160                         get;
 161                 }
 162
 163                 //
 164                 // Support methods and fields for OSVersion property
 165                 //
 166                 static OperatingSystem os;
 167
 168                 internal static extern PlatformID Platform {
 169                         [MethodImplAttribute (MethodImplOptions.InternalCall)]
 170                         get;
 171                 }
 172
 173                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 174                 internal static extern string GetOSVersionString ();
 175
 176                 /// <summary>
 177                 /// Gets the current OS version information
 178                 /// </summary>
 179                 public static OperatingSystem OSVersion {
 180                         get {
 181                                 if (os == null) {
 182                                         Version v = Version.CreateFromString (GetOSVersionString ());
 183                                         PlatformID p = Platform;
 184 #if NET_2_0
 185                                         if ((int) p == 128)
 186                                                 p = PlatformID.Unix;
 187 #endif
 188                                         os = new OperatingSystem (p, v);
 189                                 }
 190                                 return os;
 191                         }
 192                 }
 193
 194                 /// <summary>
 195                 /// Get StackTrace
 196                 /// </summary>
 197                 public static string StackTrace {
 198                         [EnvironmentPermission (SecurityAction.Demand, Unrestricted=true)]
 199                         get {
 200                                 System.Diagnostics.StackTrace trace = new System.Diagnostics.StackTrace (1, true);
 201                                 return trace.ToString ();
 202                         }
 203                 }
 204
 205                 /// <summary>
 206                 /// Get a fully qualified path to the system directory
 207                 /// </summary>
 208                 public static string SystemDirectory {
 209                         get {
 210                                 return GetFolderPath (SpecialFolder.System);
 211                         }
 212                 }
 213
 214                 /// <summary>
 215                 /// Get the number of milliseconds that have elapsed since the system was booted
 216                 /// </summary>
 217                 public extern static int TickCount {
 218                         [MethodImplAttribute (MethodImplOptions.InternalCall)]
 219                         get;
 220                 }
 221
 222                 /// <summary>
 223                 /// Get UserDomainName
 224                 /// </summary>
 225                 public static string UserDomainName {
 226                         // FIXME: this variable doesn't exist (at least not on WinXP) - reported to MS as FDBK20562
 227                         [EnvironmentPermission (SecurityAction.Demand, Read="USERDOMAINNAME")]
 228                         get {
 229                                 return MachineName;
 230                         }
 231                 }
 232
 233                 /// <summary>
 234                 /// Gets a flag indicating whether the process is in interactive mode
 235                 /// </summary>
 236                 [MonoTODO]
 237                 public static bool UserInteractive {
 238                         get {
 239                                 return false;
 240                         }
 241                 }
 242
 243                 /// <summary>
 244                 /// Get the user name of current process is running under
 245                 /// </summary>
 246                 public extern static string UserName {
 247                         [MethodImplAttribute (MethodImplOptions.InternalCall)]
 248                         [EnvironmentPermission (SecurityAction.Demand, Read="USERNAME;USER")]
 249                         get;
 250                 }
 251
 252                 /// <summary>
 253                 /// Get the version of the common language runtime
 254                 /// </summary>
 255                 public static Version Version {
 256                         get {
 257                                 return new Version (Consts.FxFileVersion);
 258                         }
 259                 }
 260
 261                 /// <summary>
 262                 /// Get the amount of physical memory mapped to process
 263                 /// </summary>
 264                 [MonoTODO]
 265                 public static long WorkingSet {
 266                         [EnvironmentPermission (SecurityAction.Demand, Unrestricted=true)]
 267                         get { return 0; }
 268                 }
 269
 270                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 271                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode=true)]
 272                 public extern static void Exit (int exitCode);
 273
 274                 /// <summary>
 275                 /// Substitute environment variables in the argument "name"
 276                 /// </summary>
 277                 public static string ExpandEnvironmentVariables (string name)
 278                 {
 279                         if (name == null)
 280                                 throw new ArgumentNullException ("name");
 281
 282                         int off1 = name.IndexOf ('%');
 283                         if (off1 == -1)
 284                                 return name;
 285
 286                         int len = name.Length;
 287                         int off2 = 0;
 288                         if (off1 == len - 1 || (off2 = name.IndexOf ('%', off1 + 1)) == -1)
 289                                 return name;
 290
 291                         StringBuilder result = new StringBuilder ();
 292                         result.Append (name, 0, off1);
 293                         Hashtable tbl = null;
 294                         do {
 295                                 string var = name.Substring (off1 + 1, off2 - off1 - 1);
 296                                 string value = GetEnvironmentVariable (var);
 297                                 if (value == null && Environment.IsRunningOnWindows) {
 298                                         // On windows, env. vars. are case insensitive
 299                                         if (tbl == null)
 300                                                 tbl = GetEnvironmentVariablesNoCase ();
 301
 302                                         value = tbl [var] as string;
 303                                 }
 304
 305                                 // If value not found, add %FOO to stream,
 306                                 //  and use the closing % for the next iteration.
 307                                 // If value found, expand it in place of %FOO%
 308                                 if (value == null) {
 309                                         result.Append ('%');
 310                                         result.Append (var);
 311                                         off2--;
 312                                 } else {
 313                                         result.Append (value);
 314                                 }
 315                                 int oldOff2 = off2;
 316                                 off1 = name.IndexOf ('%', off2 + 1);
 317                                 // If no % found for off1, don't look for one for off2
 318                                 off2 = (off1 == -1 || off2 > len-1)? -1 :name.IndexOf ('%', off1 + 1);
 319                                 // textLen is the length of text between the closing % of current iteration
 320                                 //  and the starting % of the next iteration if any. This text is added to output
 321                                 int textLen;
 322                                 // If no new % found, use all the remaining text
 323                                 if (off1 == -1 || off2 == -1)
 324                                         textLen = len - oldOff2 - 1;
 325                                 // If value found in current iteration, use text after current closing % and next %
 326                                 else if(value != null)
 327                                         textLen = off1 - oldOff2 - 1;
 328                                 // If value not found in current iteration, but a % was found for next iteration,
 329                                 //  use text from current closing % to the next %.
 330                                 else
 331                                         textLen = off1 - oldOff2;
 332                                 if(off1 >= oldOff2 || off1 == -1)
 333                                         result.Append (name, oldOff2+1, textLen);
 334                         } while (off2 > -1 && off2 < len);
 335
 336                         return result.ToString ();
 337
 338                 }
 339
 340                 /// <summary>
 341                 /// Return an array of the command line arguments of the current process
 342                 /// </summary>
 343                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 344                 [EnvironmentPermissionAttribute (SecurityAction.Demand, Read = "PATH")]
 345                 public extern static string[] GetCommandLineArgs ();
 346
 347                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 348                 internal extern static string internalGetEnvironmentVariable (string name);
 349
 350                 /// <summary>
 351                 /// Return a string containing the value of the environment
 352                 /// variable identifed by parameter "variable"
 353                 /// </summary>
 354                 public static string GetEnvironmentVariable (string name)
 355                 {
 356                         if (SecurityManager.SecurityEnabled) {
 357                                 new EnvironmentPermission (EnvironmentPermissionAccess.Read, name).Demand ();
 358                         }
 359                         return internalGetEnvironmentVariable (name);
 360                 }
 361
 362                 static Hashtable GetEnvironmentVariablesNoCase ()
 363                 {
 364                         Hashtable vars = new Hashtable (CaseInsensitiveHashCodeProvider.Default,
 365                                                         CaseInsensitiveComparer.Default);
 366
 367                         foreach (string name in GetEnvironmentVariableNames ()) {
 368                                 vars [name] = internalGetEnvironmentVariable (name);
 369                         }
 370
 371                         return vars;
 372                 }
 373
 374                 /// <summary>
 375                 /// Return a set of all environment variables and their values
 376                 /// </summary>
 377 #if NET_2_0
 378                 public static IDictionary GetEnvironmentVariables ()
 379                 {
 380                         StringBuilder sb = null;
 381                         if (SecurityManager.SecurityEnabled) {
 382                                 // we must have access to each variable to get the lot
 383                                 sb = new StringBuilder ();
 384                                 // but (performance-wise) we do not want a stack-walk
 385                                 // for each of them so we concatenate them
 386                         }
 387
 388                         Hashtable vars = new Hashtable ();
 389                         foreach (string name in GetEnvironmentVariableNames ()) {
 390                                 vars [name] = internalGetEnvironmentVariable (name);
 391                                 if (sb != null) {
 392                                         sb.Append (name);
 393                                         sb.Append (";");
 394                                 }
 395                         }
 396
 397                         if (sb != null) {
 398                                 new EnvironmentPermission (EnvironmentPermissionAccess.Read, sb.ToString ()).Demand ();
 399                         }
 400                         return vars;
 401                 }
 402 #else
 403                 [EnvironmentPermission (SecurityAction.Demand, Unrestricted=true)]
 404                 public static IDictionary GetEnvironmentVariables ()
 405                 {
 406                         Hashtable vars = new Hashtable ();
 407                         foreach (string name in GetEnvironmentVariableNames ()) {
 408                                 vars [name] = internalGetEnvironmentVariable (name);
 409                         }
 410                         return vars;
 411                 }
 412 #endif
 413
 414                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 415                 private extern static string GetWindowsFolderPath (int folder);
 416
 417                 /// <summary>
 418                 /// Returns the fully qualified path of the
 419                 /// folder specified by the "folder" parameter
 420                 /// </summary>
 421                 public static string GetFolderPath (SpecialFolder folder)
 422                 {
 423                         string dir = null;
 424
 425                         if (Environment.IsRunningOnWindows) {
 426                                 dir = GetWindowsFolderPath ((int) folder);
 427                         } else {
 428                                 dir = InternalGetFolderPath (folder);
 429                         }
 430
 431                         if ((dir != null) && (dir.Length > 0) && SecurityManager.SecurityEnabled) {
 432                                 new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dir).Demand ();
 433                         }
 434                         return dir;
 435                 }
 436
 437                 // the security runtime (and maybe other parts of corlib) needs the
 438                 // information to initialize themselves before permissions can be checked
 439                 internal static string InternalGetFolderPath (SpecialFolder folder)
 440                 {
 441                         string home = internalGetHome ();
 442
 443                         // http://freedesktop.org/Standards/basedir-spec/basedir-spec-0.6.html
 444
 445                         // note: skip security check for environment variables
 446                         string data = internalGetEnvironmentVariable ("XDG_DATA_HOME");
 447                         if ((data == null) || (data == String.Empty)) {
 448                                 data = Path.Combine (home, ".local");
 449                                 data = Path.Combine (data, "share");
 450                         }
 451
 452                         // note: skip security check for environment variables
 453                         string config = internalGetEnvironmentVariable ("XDG_CONFIG_HOME");
 454                         if ((config == null) || (config == String.Empty)) {
 455                                 config = Path.Combine (home, ".config");
 456                         }
 457
 458                         switch (folder) {
 459 #if NET_1_1
 460                         // MyComputer is a virtual directory
 461                         case SpecialFolder.MyComputer:
 462                                 return String.Empty;
 463 #endif
 464                         // personal == ~
 465                         case SpecialFolder.Personal:
 466                                 return home;
 467                         // use FDO's CONFIG_HOME. This data will be synced across a network like the windows counterpart.
 468                         case SpecialFolder.ApplicationData:
 469                                 return config;
 470                         //use FDO's DATA_HOME. This is *NOT* synced
 471                         case SpecialFolder.LocalApplicationData:
 472                                 return data;
 473 #if NET_1_1
 474                         case SpecialFolder.Desktop:
 475 #endif
 476                         case SpecialFolder.DesktopDirectory:
 477                                 return Path.Combine (home, "Desktop");
 478
 479                         // these simply dont exist on Linux
 480                         // The spec says if a folder doesnt exist, we
 481                         // should return ""
 482                         case SpecialFolder.Favorites:
 483                         case SpecialFolder.Programs:
 484                         case SpecialFolder.SendTo:
 485                         case SpecialFolder.StartMenu:
 486                         case SpecialFolder.Startup:
 487                         case SpecialFolder.MyMusic:
 488                         case SpecialFolder.MyPictures:
 489                         case SpecialFolder.Templates:
 490                         case SpecialFolder.Cookies:
 491                         case SpecialFolder.History:
 492                         case SpecialFolder.InternetCache:
 493                         case SpecialFolder.Recent:
 494                         case SpecialFolder.CommonProgramFiles:
 495                         case SpecialFolder.ProgramFiles:
 496                         case SpecialFolder.System:
 497                                 return String.Empty;
 498                         // This is where data common to all users goes
 499                         case SpecialFolder.CommonApplicationData:
 500                                 return "/usr/share";
 501                         default:
 502                                 throw new ArgumentException ("Invalid SpecialFolder");
 503                         }
 504                 }
 505
 506                 [EnvironmentPermission (SecurityAction.Demand, Unrestricted=true)]
 507                 public static string[] GetLogicalDrives ()
 508                 {
 509                         return GetLogicalDrivesInternal ();
 510                 }
 511
 512                 // FIXME: Anyone using this anywhere ?
 513                 static internal string GetResourceString (string s) { return ""; }
 514
 515
 516 #if NET_2_0
 517                 public static string GetEnvironmentVariable (string variable, EnvironmentVariableTarget target)
 518                 {
 519                         switch (target) {
 520                         case EnvironmentVariableTarget.Process:
 521                                 return GetEnvironmentVariable (variable);
 522                         case EnvironmentVariableTarget.Machine:
 523                                 new EnvironmentPermission (PermissionState.Unrestricted).Demand ();
 524                                 if (!IsRunningOnWindows)
 525                                         return null;
 526                                 using (Microsoft.Win32.RegistryKey env = Microsoft.Win32.Registry.LocalMachine.OpenSubKey (@"SYSTEM\CurrentControlSet\Control\Session Manager\Environment")) {
 527                                         return env.GetValue (variable).ToString ();
 528                                 }
 529                         case EnvironmentVariableTarget.User:
 530                                 new EnvironmentPermission (PermissionState.Unrestricted).Demand ();
 531                                 if (!IsRunningOnWindows)
 532                                         return null;
 533                                 using (Microsoft.Win32.RegistryKey env = Microsoft.Win32.Registry.CurrentUser.OpenSubKey ("Environment", false)) {
 534                                         return env.GetValue (variable).ToString ();
 535                                 }
 536                         default:
 537                                 throw new ArgumentException ("target");
 538                         }
 539                 }
 540
 541                 public static IDictionary GetEnvironmentVariables (EnvironmentVariableTarget target)
 542                 {
 543                         IDictionary variables = (IDictionary)new Hashtable ();
 544                         switch (target) {
 545                         case EnvironmentVariableTarget.Process:
 546                                 variables = GetEnvironmentVariables ();
 547                                 break;
 548                         case EnvironmentVariableTarget.Machine:
 549                                 new EnvironmentPermission (PermissionState.Unrestricted).Demand ();
 550                                 if (IsRunningOnWindows) {
 551                                         using (Microsoft.Win32.RegistryKey env = Microsoft.Win32.Registry.LocalMachine.OpenSubKey (@"SYSTEM\CurrentControlSet\Control\Session Manager\Environment")) {
 552                                                 string[] value_names = env.GetValueNames ();
 553                                                 foreach (string value_name in value_names)
 554                                                         variables.Add (value_name, env.GetValue (value_name));
 555                                         }
 556                                 }
 557                                 break;
 558                         case EnvironmentVariableTarget.User:
 559                                 new EnvironmentPermission (PermissionState.Unrestricted).Demand ();
 560                                 if (IsRunningOnWindows) {
 561                                         using (Microsoft.Win32.RegistryKey env = Microsoft.Win32.Registry.CurrentUser.OpenSubKey ("Environment")) {
 562                                                 string[] value_names = env.GetValueNames ();
 563                                                 foreach (string value_name in value_names)
 564                                                         variables.Add (value_name, env.GetValue (value_name));
 565                                         }
 566                                 }
 567                                 break;
 568                         default:
 569                                 throw new ArgumentException ("target");
 570                         }
 571                         return variables;
 572                 }
 573
 574                 [EnvironmentPermission (SecurityAction.Demand, Unrestricted=true)]
 575                 public static void SetEnvironmentVariable (string variable, string value)
 576                 {
 577                         SetEnvironmentVariable (variable, value, EnvironmentVariableTarget.Process);
 578                 }
 579
 580                 [EnvironmentPermission (SecurityAction.Demand, Unrestricted = true)]
 581                 public static void SetEnvironmentVariable (string variable, string value, EnvironmentVariableTarget target)
 582                 {
 583                         if (variable == null)
 584                                 throw new ArgumentNullException ("variable");
 585                         if (variable == String.Empty)
 586                                 throw new ArgumentException ("String cannot be of zero length.", "variable");
 587                         if (variable.IndexOf ('=') != -1)
 588                                 throw new ArgumentException ("Environment variable name cannot contain an equal character.", "variable");
 589                         if (variable[0] == '\0')
 590                                 throw new ArgumentException ("The first char in the string is the null character.", "variable");
 591
 592                         switch (target) {
 593                         case EnvironmentVariableTarget.Process:
 594                                 InternalSetEnvironmentVariable (variable, value);
 595                                 break;
 596                         case EnvironmentVariableTarget.Machine:
 597                                 if (!IsRunningOnWindows)
 598                                         return;
 599                                 using (Microsoft.Win32.RegistryKey env = Microsoft.Win32.Registry.LocalMachine.OpenSubKey (@"SYSTEM\CurrentControlSet\Control\Session Manager\Environment", true)) {
 600                                         if (value == null || value.Length == 0)
 601                                                 env.DeleteValue (variable, false);
 602                                         else
 603                                                 env.SetValue (variable, value);
 604                                 }
 605                                 break;
 606                         case EnvironmentVariableTarget.User:
 607                                 if (!IsRunningOnWindows)
 608                                         return;
 609                                 using (Microsoft.Win32.RegistryKey env = Microsoft.Win32.Registry.CurrentUser.OpenSubKey ("Environment", true)) {
 610                                         if (value == null || value.Length == 0)
 611                                                 env.DeleteValue (variable, false);
 612                                         else
 613                                                 env.SetValue (variable, value);
 614                                 }
 615                                 break;
 616                         default:
 617                                 throw new ArgumentException ("target");
 618                         }
 619                 }
 620
 621                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 622                 internal static extern void InternalSetEnvironmentVariable (string variable, string value);
 623
 624                 [MonoTODO]
 625                 public static int ProcessorCount {
 626                         [EnvironmentPermission (SecurityAction.Demand, Read="NUMBER_OF_PROCESSORS")]
 627                         get {
 628                                 // note: Changes to the NUMBER_OF_PROCESSORS environment variable
 629                                 // under Windows doesn't affect the (good) value returned.
 630                                 throw new NotImplementedException ();
 631                         }
 632                 }
 633
 634                 [MonoTODO ("not much documented")]
 635                 [SecurityPermission (SecurityAction.LinkDemand, UnmanagedCode=true)]
 636                 public static void FailFast (string message)
 637                 {
 638                         throw new NotImplementedException ();
 639                 }
 640 #endif
 641
 642                 // private methods
 643
 644                 internal static bool IsRunningOnWindows {
 645                         get { return ((int) Platform != 128); }
 646                 }
 647
 648                 private static string GacPath {
 649                         get {
 650                                 if (Environment.IsRunningOnWindows) {
 651                                         /* On windows, we don't know the path where mscorlib.dll will be installed */
 652                                         string corlibDir = new DirectoryInfo (Path.GetDirectoryName (typeof (int).Assembly.Location)).Parent.Parent.FullName;
 653                                         return Path.Combine (Path.Combine (corlibDir, "mono"), "gac");
 654                                 }
 655
 656                                 return Path.Combine (Path.Combine (internalGetGacPath (), "mono"), "gac");
 657                         }
 658                 }
 659
 660                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 661                 private extern static string [] GetLogicalDrivesInternal ();
 662
 663                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 664                 private extern static string [] GetEnvironmentVariableNames ();
 665
 666                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 667                 internal extern static string GetMachineConfigPath ();
 668
 669                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 670                 internal extern static string internalGetGacPath ();
 671
 672                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 673                 internal extern static string internalGetHome ();
 674         }
 675 }
 676