mcs/class/System/System.Diagnostics/Process.cs

   1 //
   2 // System.Diagnostics.Process.cs
   3 //
   4 // Authors:
   5 //      Dick Porter (dick@ximian.com)
   6 //      Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   8 //
   9 // (C) 2002 Ximian, Inc.
  10 // (C) 2003 Andreas Nahr
  11 // (c) 2004,2005,2006 Novell, Inc. (http://www.novell.com)
  12 //
  13
  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.Text;
  37 using System.Collections;
  38 using System.ComponentModel;
  39 using System.ComponentModel.Design;
  40 using System.Runtime.CompilerServices;
  41 using System.Runtime.InteropServices;
  42 using System.Runtime.Remoting.Messaging;
  43 using System.Security.Permissions;
  44 using System.Collections.Generic;
  45 using System.Security;
  46 using System.Threading;
  47 using Microsoft.Win32;
  48 using Microsoft.Win32.SafeHandles;
  49
  50 namespace System.Diagnostics
  51 {
  52         public partial class Process : Component
  53         {
  54                 [StructLayout(LayoutKind.Sequential)]
  55                 private struct ProcInfo
  56                 {
  57                         public IntPtr process_handle;
  58                         /* If thread_handle is ever needed for
  59                          * something, take out the CloseHandle() in
  60                          * the Start_internal icall in
  61                          * mono/metadata/process.c
  62                          */
  63                         public IntPtr thread_handle;
  64                         public int pid; // Contains -GetLastError () on failure.
  65                         public int tid;
  66                         public string[] envVariables;
  67                         public string UserName;
  68                         public string Domain;
  69                         public IntPtr Password;
  70                         public bool LoadUserProfile;
  71                 };
  72
  73                 string process_name;
  74
  75                 /* Private constructor called from other methods */
  76                 private Process (SafeProcessHandle handle, int id) {
  77                         SetProcessHandle (handle);
  78                         SetProcessId (id);
  79                 }
  80
  81                 [MonoTODO]
  82                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  83                 [MonitoringDescription ("Base process priority.")]
  84                 public int BasePriority {
  85                         get { return 0; }
  86                 }
  87
  88                 [MonoTODO]
  89                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
  90                 [MonitoringDescription ("Handles for this process.")]
  91                 public int HandleCount {
  92                         get {
  93                                 return(0);
  94                         }
  95                 }
  96
  97                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden), Browsable (false)]
  98                 [MonitoringDescription ("The main module of the process.")]
  99                 public ProcessModule MainModule {
 100                         get {
 101                                 return(this.Modules[0]);
 102                         }
 103                 }
 104
 105                 [MonoTODO]
 106                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 107                 [MonitoringDescription ("The handle of the main window of the process.")]
 108                 public IntPtr MainWindowHandle {
 109                         get {
 110                                 return((IntPtr)0);
 111                         }
 112                 }
 113
 114                 [MonoTODO]
 115                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 116                 [MonitoringDescription ("The title of the main window of the process.")]
 117                 public string MainWindowTitle {
 118                         get {
 119                                 return("null");
 120                         }
 121                 }
 122
 123                 /* Returns the list of process modules.  The main module is
 124                  * element 0.
 125                  */
 126                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 127                 private extern ProcessModule[] GetModules_internal(IntPtr handle);
 128
 129                 ProcessModule[] GetModules_internal (SafeProcessHandle handle)
 130                 {
 131                         bool release = false;
 132                         try {
 133                                 handle.DangerousAddRef (ref release);
 134                                 return GetModules_internal (handle.DangerousGetHandle ());
 135                         } finally {
 136                                 if (release)
 137                                         handle.DangerousRelease ();
 138                         }
 139                 }
 140
 141                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden), Browsable (false)]
 142                 [MonitoringDescription ("The modules that are loaded as part of this process.")]
 143                 public ProcessModuleCollection Modules {
 144                         get {
 145                                 if (modules == null) {
 146                                         SafeProcessHandle handle = null;
 147                                         try {
 148                                                 handle = GetProcessHandle (NativeMethods.PROCESS_QUERY_INFORMATION);
 149                                                 modules = new ProcessModuleCollection (GetModules_internal (handle));
 150                                         } finally {
 151                                                 ReleaseProcessHandle (handle);
 152                                         }
 153                                 }
 154
 155                                 return modules;
 156                         }
 157                 }
 158
 159                 /* data type is from the MonoProcessData enum in mono-proclib.h in the runtime */
 160                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 161                 private extern static long GetProcessData (int pid, int data_type, out int error);
 162
 163                 [MonoTODO]
 164                 [Obsolete ("Use NonpagedSystemMemorySize64")]
 165                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 166                 [MonitoringDescription ("The number of bytes that are not pageable.")]
 167                 public int NonpagedSystemMemorySize {
 168                         get {
 169                                 return(0);
 170                         }
 171                 }
 172
 173                 [Obsolete ("Use PagedMemorySize64")]
 174                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 175                 [MonitoringDescription ("The number of bytes that are paged.")]
 176                 public int PagedMemorySize {
 177                         get {
 178                                 return(int)PagedMemorySize64;
 179                         }
 180                 }
 181
 182                 [Obsolete ("Use PagedSystemMemorySize64")]
 183                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 184                 [MonitoringDescription ("The amount of paged system memory in bytes.")]
 185                 public int PagedSystemMemorySize {
 186                         get {
 187                                 return(int)PagedMemorySize64;
 188                         }
 189                 }
 190
 191                 [MonoTODO]
 192                 [Obsolete ("Use PeakPagedMemorySize64")]
 193                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 194                 [MonitoringDescription ("The maximum amount of paged memory used by this process.")]
 195                 public int PeakPagedMemorySize {
 196                         get {
 197                                 return(0);
 198                         }
 199                 }
 200
 201                 [Obsolete ("Use PeakVirtualMemorySize64")]
 202                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 203                 [MonitoringDescription ("The maximum amount of virtual memory used by this process.")]
 204                 public int PeakVirtualMemorySize {
 205                         get {
 206                                 int error;
 207                                 return (int)GetProcessData (processId, 8, out error);
 208                         }
 209                 }
 210
 211                 [Obsolete ("Use PeakWorkingSet64")]
 212                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 213                 [MonitoringDescription ("The maximum amount of system memory used by this process.")]
 214                 public int PeakWorkingSet {
 215                         get {
 216                                 int error;
 217                                 return (int)GetProcessData (processId, 5, out error);
 218                         }
 219                 }
 220
 221                 [MonoTODO]
 222                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 223                 [MonitoringDescription ("The number of bytes that are not pageable.")]
 224                 [ComVisible (false)]
 225                 public long NonpagedSystemMemorySize64 {
 226                         get {
 227                                 return(0);
 228                         }
 229                 }
 230
 231                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 232                 [MonitoringDescription ("The number of bytes that are paged.")]
 233                 [ComVisible (false)]
 234                 public long PagedMemorySize64 {
 235                         get {
 236                                 int error;
 237                                 return GetProcessData (processId, 12, out error);
 238                         }
 239                 }
 240
 241                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 242                 [MonitoringDescription ("The amount of paged system memory in bytes.")]
 243                 [ComVisible (false)]
 244                 public long PagedSystemMemorySize64 {
 245                         get {
 246                                 return PagedMemorySize64;
 247                         }
 248                 }
 249
 250                 [MonoTODO]
 251                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 252                 [MonitoringDescription ("The maximum amount of paged memory used by this process.")]
 253                 [ComVisible (false)]
 254                 public long PeakPagedMemorySize64 {
 255                         get {
 256                                 return(0);
 257                         }
 258                 }
 259
 260                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 261                 [MonitoringDescription ("The maximum amount of virtual memory used by this process.")]
 262                 [ComVisible (false)]
 263                 public long PeakVirtualMemorySize64 {
 264                         get {
 265                                 int error;
 266                                 return GetProcessData (processId, 8, out error);
 267                         }
 268                 }
 269
 270                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 271                 [MonitoringDescription ("The maximum amount of system memory used by this process.")]
 272                 [ComVisible (false)]
 273                 public long PeakWorkingSet64 {
 274                         get {
 275                                 int error;
 276                                 return GetProcessData (processId, 5, out error);
 277                         }
 278                 }
 279
 280                 [MonoTODO]
 281                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 282                 [MonitoringDescription ("Process will be of higher priority while it is actively used.")]
 283                 public bool PriorityBoostEnabled {
 284                         get {
 285                                 return(false);
 286                         }
 287                         set {
 288                         }
 289                 }
 290
 291                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 292                 [MonitoringDescription ("The amount of memory exclusively used by this process.")]
 293                 [Obsolete ("Use PrivateMemorySize64")]
 294                 public int PrivateMemorySize {
 295                         get {
 296                                 int error;
 297                                 return (int)GetProcessData (processId, 6, out error);
 298                         }
 299                 }
 300
 301                 [MonoNotSupported ("")]
 302                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 303                 [MonitoringDescription ("The session ID for this process.")]
 304                 public int SessionId {
 305                         get { return 0; }
 306                 }
 307
 308                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 309                 private extern static string ProcessName_internal(IntPtr handle);
 310
 311                 static string ProcessName_internal(SafeProcessHandle handle)
 312                 {
 313                         bool release = false;
 314                         try {
 315                                 handle.DangerousAddRef (ref release);
 316                                 return ProcessName_internal (handle.DangerousGetHandle ());
 317                         } finally {
 318                                 if (release)
 319                                         handle.DangerousRelease ();
 320                         }
 321                 }
 322
 323                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 324                 [MonitoringDescription ("The name of this process.")]
 325                 public string ProcessName {
 326                         get {
 327                                 if (process_name == null) {
 328                                         SafeProcessHandle handle = null;
 329                                         try {
 330                                                 handle = GetProcessHandle (NativeMethods.PROCESS_QUERY_INFORMATION);
 331
 332                                                 process_name = ProcessName_internal (handle);
 333
 334                                                 /* If process_name is _still_ null, assume the process has exited or is inaccessible */
 335                                                 if (process_name == null)
 336                                                         throw new InvalidOperationException ("Process has exited or is inaccessible, so the requested information is not available.");
 337
 338                                                 /* Strip the suffix (if it exists) simplistically instead of removing
 339                                                  * any trailing \.???, so we dont get stupid results on sane systems */
 340                                                 if(process_name.EndsWith(".exe") || process_name.EndsWith(".bat") || process_name.EndsWith(".com"))
 341                                                         process_name = process_name.Substring (0, process_name.Length - 4);
 342                                         } finally {
 343                                                 ReleaseProcessHandle (handle);
 344                                         }
 345                                 }
 346                                 return process_name;
 347                         }
 348                 }
 349
 350                 [MonoTODO]
 351                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 352                 [MonitoringDescription ("Allowed processor that can be used by this process.")]
 353                 public IntPtr ProcessorAffinity {
 354                         get {
 355                                 return((IntPtr)0);
 356                         }
 357                         set {
 358                         }
 359                 }
 360
 361                 [MonoTODO]
 362                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 363                 [MonitoringDescription ("Is this process responsive.")]
 364                 public bool Responding {
 365                         get {
 366                                 return(false);
 367                         }
 368                 }
 369
 370 #if !MONO_FEATURE_PROCESS_START
 371                 [Obsolete ("Process.StartInfo is not supported on the current platform.", true)]
 372                 public ProcessStartInfo StartInfo {
 373                         get { throw new PlatformNotSupportedException ("Process.StartInfo is not supported on the current platform."); }
 374                         set { throw new PlatformNotSupportedException ("Process.StartInfo is not supported on the current platform."); }
 375                 }
 376
 377                 [Obsolete ("Process.StandardError is not supported on the current platform.", true)]
 378                 public StreamReader StandardError {
 379                         get { throw new PlatformNotSupportedException ("Process.StandardError is not supported on the current platform."); }
 380                 }
 381
 382                 [Obsolete ("Process.StandardInput is not supported on the current platform.", true)]
 383                 public StreamWriter StandardInput {
 384                         get { throw new PlatformNotSupportedException ("Process.StandardInput is not supported on the current platform."); }
 385                 }
 386
 387                 [Obsolete ("Process.StandardOutput is not supported on the current platform.", true)]
 388                 public StreamReader StandardOutput {
 389                         get { throw new PlatformNotSupportedException ("Process.StandardOutput is not supported on the current platform."); }
 390                 }
 391 #endif // !MONO_FEATURE_PROCESS_START
 392
 393                 [MonoTODO]
 394                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 395                 [MonitoringDescription ("The number of threads of this process.")]
 396                 public ProcessThreadCollection Threads {
 397                         get {
 398                                 if (threads == null) {
 399                                         int error;
 400                                         // This'll return a correctly-sized array of empty ProcessThreads for now.
 401                                         threads = new ProcessThreadCollection(new ProcessThread [GetProcessData (processId, 0, out error)]);
 402                                 }
 403
 404                                 return threads;
 405                         }
 406                 }
 407
 408                 [Obsolete ("Use VirtualMemorySize64")]
 409                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 410                 [MonitoringDescription ("The amount of virtual memory currently used for this process.")]
 411                 public int VirtualMemorySize {
 412                         get {
 413                                 int error;
 414                                 return (int)GetProcessData (processId, 7, out error);
 415                         }
 416                 }
 417
 418                 [Obsolete ("Use WorkingSet64")]
 419                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 420                 [MonitoringDescription ("The amount of physical memory currently used for this process.")]
 421                 public int WorkingSet {
 422                         get {
 423                                 int error;
 424                                 return (int)GetProcessData (processId, 4, out error);
 425                         }
 426                 }
 427
 428                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 429                 [MonitoringDescription ("The amount of memory exclusively used by this process.")]
 430                 [ComVisible (false)]
 431                 public long PrivateMemorySize64 {
 432                         get {
 433                                 int error;
 434                                 return GetProcessData (processId, 6, out error);
 435                         }
 436                 }
 437
 438                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 439                 [MonitoringDescription ("The amount of virtual memory currently used for this process.")]
 440                 [ComVisible (false)]
 441                 public long VirtualMemorySize64 {
 442                         get {
 443                                 int error;
 444                                 return GetProcessData (processId, 7, out error);
 445                         }
 446                 }
 447
 448                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 449                 [MonitoringDescription ("The amount of physical memory currently used for this process.")]
 450                 [ComVisible (false)]
 451                 public long WorkingSet64 {
 452                         get {
 453                                 int error;
 454                                 return GetProcessData (processId, 4, out error);
 455                         }
 456                 }
 457
 458                 public bool CloseMainWindow ()
 459                 {
 460                         SafeProcessHandle handle = null;
 461                         try {
 462                                 handle = GetProcessHandle (NativeMethods.PROCESS_TERMINATE);
 463                                 return NativeMethods.TerminateProcess(handle, -2);
 464                         } finally {
 465                                 ReleaseProcessHandle(handle);
 466                         }
 467                 }
 468
 469                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 470                 private extern static IntPtr GetProcess_internal(int pid);
 471
 472                 [MonoTODO ("There is no support for retrieving process information from a remote machine")]
 473                 public static Process GetProcessById(int processId, string machineName) {
 474                         if (machineName == null)
 475                                 throw new ArgumentNullException ("machineName");
 476
 477                         if (!IsLocalMachine (machineName))
 478                                 throw new NotImplementedException ();
 479
 480                         IntPtr proc = GetProcess_internal(processId);
 481
 482                         if (proc == IntPtr.Zero)
 483                                 throw new ArgumentException ("Can't find process with ID " + processId.ToString ());
 484
 485                         /* The handle returned by GetProcess_internal is owned by its caller, so we must pass true to SafeProcessHandle */
 486                         return (new Process (new SafeProcessHandle (proc, true), processId));
 487                 }
 488
 489                 public static Process[] GetProcessesByName(string processName, string machineName)
 490                 {
 491                         if (machineName == null)
 492                                 throw new ArgumentNullException ("machineName");
 493
 494                         if (!IsLocalMachine (machineName))
 495                                 throw new NotImplementedException ();
 496
 497                         Process[] processes = GetProcesses ();
 498                         if (processes.Length == 0)
 499                                 return processes;
 500
 501                         int size = 0;
 502
 503                         for (int i = 0; i < processes.Length; i++) {
 504                                 try {
 505                                         if (String.Compare (processName, processes[i].ProcessName, true) == 0)
 506                                                 processes [size++] = processes[i];
 507                                 } catch (SystemException) {
 508                                         /* The process might exit between GetProcesses_internal and GetProcessById */
 509                                 }
 510                         }
 511
 512                         Array.Resize<Process> (ref processes, size);
 513
 514                         return processes;
 515                 }
 516
 517                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 518                 private extern static int[] GetProcesses_internal();
 519
 520                 [MonoTODO ("There is no support for retrieving process information from a remote machine")]
 521                 public static Process[] GetProcesses(string machineName) {
 522                         if (machineName == null)
 523                                 throw new ArgumentNullException ("machineName");
 524
 525                         if (!IsLocalMachine (machineName))
 526                                 throw new NotImplementedException ();
 527
 528                         int [] pids = GetProcesses_internal ();
 529                         if (pids == null)
 530                                 return new Process [0];
 531
 532                         var proclist = new List<Process> (pids.Length);
 533                         for (int i = 0; i < pids.Length; i++) {
 534                                 try {
 535                                         proclist.Add (GetProcessById (pids [i]));
 536                                 } catch (SystemException) {
 537                                         /* The process might exit
 538                                          * between
 539                                          * GetProcesses_internal and
 540                                          * GetProcessById
 541                                          */
 542                                 }
 543                         }
 544
 545                         return proclist.ToArray ();
 546                 }
 547
 548                 private static bool IsLocalMachine (string machineName)
 549                 {
 550                         if (machineName == "." || machineName.Length == 0)
 551                                 return true;
 552
 553                         return (string.Compare (machineName, Environment.MachineName, true) == 0);
 554                 }
 555
 556 #if MONO_FEATURE_PROCESS_START
 557                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 558                 private extern static bool ShellExecuteEx_internal(ProcessStartInfo startInfo, ref ProcInfo procInfo);
 559
 560                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 561                 private extern static bool CreateProcess_internal(ProcessStartInfo startInfo, IntPtr stdin, IntPtr stdout, IntPtr stderr, ref ProcInfo procInfo);
 562
 563                 bool StartWithShellExecuteEx (ProcessStartInfo startInfo)
 564                 {
 565                         if (this.disposed)
 566                                 throw new ObjectDisposedException (GetType ().Name);
 567
 568                         if (!String.IsNullOrEmpty(startInfo.UserName) || (startInfo.Password != null))
 569                                 throw new InvalidOperationException(SR.GetString(SR.CantStartAsUser));
 570
 571                         if (startInfo.RedirectStandardInput || startInfo.RedirectStandardOutput || startInfo.RedirectStandardError)
 572                                 throw new InvalidOperationException(SR.GetString(SR.CantRedirectStreams));
 573
 574                         if (startInfo.StandardErrorEncoding != null)
 575                                 throw new InvalidOperationException(SR.GetString(SR.StandardErrorEncodingNotAllowed));
 576
 577                         if (startInfo.StandardOutputEncoding != null)
 578                                 throw new InvalidOperationException(SR.GetString(SR.StandardOutputEncodingNotAllowed));
 579
 580                         // can't set env vars with ShellExecuteEx...
 581                         if (startInfo.environmentVariables != null)
 582                                 throw new InvalidOperationException(SR.GetString(SR.CantUseEnvVars));
 583
 584                         ProcInfo procInfo = new ProcInfo();
 585                         bool ret;
 586
 587                         FillUserInfo (startInfo, ref procInfo);
 588                         try {
 589                                 ret = ShellExecuteEx_internal (startInfo, ref procInfo);
 590                         } finally {
 591                                 if (procInfo.Password != IntPtr.Zero)
 592                                         Marshal.ZeroFreeBSTR (procInfo.Password);
 593                                 procInfo.Password = IntPtr.Zero;
 594                         }
 595                         if (!ret) {
 596                                 throw new Win32Exception (-procInfo.pid);
 597                         }
 598
 599                         SetProcessHandle (new SafeProcessHandle (procInfo.process_handle, true));
 600                         SetProcessId (procInfo.pid);
 601
 602                         return ret;
 603                 }
 604
 605                 //
 606                 // Creates a pipe with read and write descriptors
 607                 //
 608                 static void CreatePipe (out IntPtr read, out IntPtr write, bool writeDirection)
 609                 {
 610                         MonoIOError error;
 611
 612                         //
 613                         // Creates read/write pipe from parent -> child perspective
 614                         // a child process uses same descriptors after fork. That's
 615                         // 4 descriptors in total where only 2. One in child, one in parent
 616                         // should be active and the other 2 closed. Which ones depends on
 617                         // comunication direction
 618                         //
 619                         // parent  -------->  child   (parent can write, child can read)
 620                         //
 621                         // read: closed       read: used
 622                         // write: used        write: closed
 623                         //
 624                         //
 625                         // parent  <--------  child   (parent can read, child can write)
 626                         //
 627                         // read: used         read: closed
 628                         // write: closed      write: used
 629                         //
 630                         // It can still be tricky for predefined descriptiors http://unixwiz.net/techtips/remap-pipe-fds.html
 631                         //
 632                         if (!MonoIO.CreatePipe (out read, out write, out error))
 633                                 throw MonoIO.GetException (error);
 634
 635                         if (IsWindows) {
 636                                 const int DUPLICATE_SAME_ACCESS = 0x00000002;
 637                                 var tmp = writeDirection ? write : read;
 638
 639                                 if (!MonoIO.DuplicateHandle (Process.GetCurrentProcess ().Handle, tmp, Process.GetCurrentProcess ().Handle, out tmp, 0, 0, DUPLICATE_SAME_ACCESS, out error))
 640                                         throw MonoIO.GetException (error);
 641
 642                                 if (writeDirection) {
 643                                         if (!MonoIO.Close (write, out error))
 644                                                 throw MonoIO.GetException (error);
 645                                         write = tmp;
 646                                 } else {
 647                                         if (!MonoIO.Close (read, out error))
 648                                                 throw MonoIO.GetException (error);
 649                                         read = tmp;
 650                                 }
 651                         }
 652                 }
 653
 654                 static bool IsWindows
 655                 {
 656                         get
 657                         {
 658                                 PlatformID platform = Environment.OSVersion.Platform;
 659                                 if (platform == PlatformID.Win32S ||
 660                                         platform == PlatformID.Win32Windows ||
 661                                         platform == PlatformID.Win32NT ||
 662                                         platform == PlatformID.WinCE) {
 663                                         return true;
 664                                 }
 665                                 return false;
 666                         }
 667                 }
 668
 669                 bool StartWithCreateProcess (ProcessStartInfo startInfo)
 670                 {
 671                         if (startInfo.StandardOutputEncoding != null && !startInfo.RedirectStandardOutput)
 672                                 throw new InvalidOperationException (SR.GetString(SR.StandardOutputEncodingNotAllowed));
 673
 674                         if (startInfo.StandardErrorEncoding != null && !startInfo.RedirectStandardError)
 675                                 throw new InvalidOperationException (SR.GetString(SR.StandardErrorEncodingNotAllowed));
 676
 677                         if (this.disposed)
 678                                 throw new ObjectDisposedException (GetType ().Name);
 679
 680                         var procInfo = new ProcInfo ();
 681
 682                         if (startInfo.HaveEnvVars) {
 683                                 List<string> envVariables = null;
 684                                 StringBuilder sb = null;
 685
 686                                 foreach (DictionaryEntry de in startInfo.EnvironmentVariables) {
 687                                         if (de.Value == null)
 688                                                 continue;
 689
 690                                         if (envVariables == null)
 691                                                 envVariables = new List<string> ();
 692
 693                                         if (sb == null)
 694                                                 sb = new StringBuilder ();
 695                                         else
 696                                                 sb.Clear ();
 697
 698                                         sb.Append ((string) de.Key);
 699                                         sb.Append ('=');
 700                                         sb.Append ((string) de.Value);
 701
 702                                         envVariables.Add (sb.ToString ());
 703                                 }
 704
 705                                 procInfo.envVariables = envVariables?.ToArray ();
 706                         }
 707
 708                         MonoIOError error;
 709                         IntPtr stdin_read = IntPtr.Zero, stdin_write = IntPtr.Zero;
 710                         IntPtr stdout_read = IntPtr.Zero, stdout_write = IntPtr.Zero;
 711                         IntPtr stderr_read = IntPtr.Zero, stderr_write = IntPtr.Zero;
 712
 713                         try {
 714                                 if (startInfo.RedirectStandardInput) {
 715                                         CreatePipe (out stdin_read, out stdin_write, true);
 716                                 } else {
 717                                         stdin_read = MonoIO.ConsoleInput;
 718                                         stdin_write = IntPtr.Zero;
 719                                 }
 720
 721                                 if (startInfo.RedirectStandardOutput) {
 722                                         CreatePipe (out stdout_read, out stdout_write, false);
 723                                 } else {
 724                                         stdout_read = IntPtr.Zero;
 725                                         stdout_write = MonoIO.ConsoleOutput;
 726                                 }
 727
 728                                 if (startInfo.RedirectStandardError) {
 729                                         CreatePipe (out stderr_read, out stderr_write, false);
 730                                 } else {
 731                                         stderr_read = IntPtr.Zero;
 732                                         stderr_write = MonoIO.ConsoleError;
 733                                 }
 734
 735                                 FillUserInfo (startInfo, ref procInfo);
 736
 737                                 //
 738                                 // FIXME: For redirected pipes we need to send descriptors of
 739                                 // stdin_write, stdout_read, stderr_read to child process and
 740                                 // close them there (fork makes exact copy of parent's descriptors)
 741                                 //
 742                                 if (!CreateProcess_internal (startInfo, stdin_read, stdout_write, stderr_write, ref procInfo)) {
 743                                         throw new Win32Exception (-procInfo.pid, "ApplicationName='" + startInfo.FileName + "', CommandLine='" + startInfo.Arguments +
 744                                                 "', CurrentDirectory='" + startInfo.WorkingDirectory + "', Native error= " + Win32Exception.GetErrorMessage (-procInfo.pid));
 745                                 }
 746                         } catch {
 747                                 if (startInfo.RedirectStandardInput) {
 748                                         if (stdin_read != IntPtr.Zero)
 749                                                 MonoIO.Close (stdin_read, out error);
 750                                         if (stdin_write != IntPtr.Zero)
 751                                                 MonoIO.Close (stdin_write, out error);
 752                                 }
 753
 754                                 if (startInfo.RedirectStandardOutput) {
 755                                         if (stdout_read != IntPtr.Zero)
 756                                                 MonoIO.Close (stdout_read, out error);
 757                                         if (stdout_write != IntPtr.Zero)
 758                                                 MonoIO.Close (stdout_write, out error);
 759                                 }
 760
 761                                 if (startInfo.RedirectStandardError) {
 762                                         if (stderr_read != IntPtr.Zero)
 763                                                 MonoIO.Close (stderr_read, out error);
 764                                         if (stderr_write != IntPtr.Zero)
 765                                                 MonoIO.Close (stderr_write, out error);
 766                                 }
 767
 768                                 throw;
 769                         } finally {
 770                                 if (procInfo.Password != IntPtr.Zero) {
 771                                         Marshal.ZeroFreeBSTR (procInfo.Password);
 772                                         procInfo.Password = IntPtr.Zero;
 773                                 }
 774                         }
 775
 776                         SetProcessHandle (new SafeProcessHandle (procInfo.process_handle, true));
 777                         SetProcessId (procInfo.pid);
 778
 779 #pragma warning disable 618
 780
 781                         if (startInfo.RedirectStandardInput) {
 782                                 MonoIO.Close (stdin_read, out error);
 783
 784 #if MOBILE
 785                                 var stdinEncoding = Encoding.Default;
 786 #else
 787                                 var stdinEncoding = Console.InputEncoding;
 788 #endif
 789                                 standardInput = new StreamWriter (new FileStream (stdin_write, FileAccess.Write, true, 8192), stdinEncoding) {
 790                                         AutoFlush = true
 791                                 };
 792                         }
 793
 794                         if (startInfo.RedirectStandardOutput) {
 795                                 MonoIO.Close (stdout_write, out error);
 796
 797                                 Encoding stdoutEncoding = startInfo.StandardOutputEncoding ?? Console.Out.Encoding;
 798
 799                                 standardOutput = new StreamReader (new FileStream (stdout_read, FileAccess.Read, true, 8192), stdoutEncoding, true);
 800                         }
 801
 802                         if (startInfo.RedirectStandardError) {
 803                                 MonoIO.Close (stderr_write, out error);
 804
 805                                 Encoding stderrEncoding = startInfo.StandardErrorEncoding ?? Console.Out.Encoding;
 806
 807                                 standardError = new StreamReader (new FileStream (stderr_read, FileAccess.Read, true, 8192), stderrEncoding, true);
 808                         }
 809 #pragma warning restore
 810
 811                         return true;
 812                 }
 813
 814                 // Note that ProcInfo.Password must be freed.
 815                 private static void FillUserInfo (ProcessStartInfo startInfo, ref ProcInfo procInfo)
 816                 {
 817                         if (startInfo.UserName.Length != 0) {
 818                                 procInfo.UserName = startInfo.UserName;
 819                                 procInfo.Domain = startInfo.Domain;
 820                                 if (startInfo.Password != null)
 821                                         procInfo.Password = Marshal.SecureStringToBSTR (startInfo.Password);
 822                                 else
 823                                         procInfo.Password = IntPtr.Zero;
 824                                 procInfo.LoadUserProfile = startInfo.LoadUserProfile;
 825                         }
 826                 }
 827 #else
 828                 [Obsolete ("Process.Start is not supported on the current platform.", true)]
 829                 public bool Start ()
 830                 {
 831                         throw new PlatformNotSupportedException ("Process.Start is not supported on the current platform.");
 832                 }
 833
 834                 [Obsolete ("Process.Start is not supported on the current platform.", true)]
 835                 public static Process Start (ProcessStartInfo startInfo)
 836                 {
 837                         throw new PlatformNotSupportedException ("Process.Start is not supported on the current platform.");
 838                 }
 839
 840                 [Obsolete ("Process.Start is not supported on the current platform.", true)]
 841                 public static Process Start (string fileName)
 842                 {
 843                         throw new PlatformNotSupportedException ("Process.Start is not supported on the current platform.");
 844                 }
 845
 846                 [Obsolete ("Process.Start is not supported on the current platform.", true)]
 847                 public static Process Start(string fileName, string arguments)
 848                 {
 849                         throw new PlatformNotSupportedException ("Process.Start is not supported on the current platform.");
 850                 }
 851
 852                 [Obsolete ("Process.Start is not supported on the current platform.", true)]
 853                 public static Process Start(string fileName, string userName, SecureString password, string domain)
 854                 {
 855                         throw new PlatformNotSupportedException ("Process.Start is not supported on the current platform.");
 856                 }
 857
 858                 [Obsolete ("Process.Start is not supported on the current platform.", true)]
 859                 public static Process Start(string fileName, string arguments, string userName, SecureString password, string domain)
 860                 {
 861                         throw new PlatformNotSupportedException ("Process.Start is not supported on the current platform.");
 862                 }
 863 #endif // MONO_FEATURE_PROCESS_START
 864
 865 #if !MONO_FEATURE_PROCESS_START
 866                 [Obsolete ("Process.BeginOutputReadLine is not supported on the current platform.", true)]
 867                 public void BeginOutputReadLine ()
 868                 {
 869                         throw new PlatformNotSupportedException ("Process.BeginOutputReadLine is not supported on the current platform.");
 870                 }
 871
 872                 [Obsolete ("Process.BeginOutputReadLine is not supported on the current platform.", true)]
 873                 public void CancelOutputRead ()
 874                 {
 875                         throw new PlatformNotSupportedException ("Process.BeginOutputReadLine is not supported on the current platform.");
 876                 }
 877
 878                 [Obsolete ("Process.BeginOutputReadLine is not supported on the current platform.", true)]
 879                 public void BeginErrorReadLine ()
 880                 {
 881                         throw new PlatformNotSupportedException ("Process.BeginOutputReadLine is not supported on the current platform.");
 882                 }
 883
 884                 [Obsolete ("Process.BeginOutputReadLine is not supported on the current platform.", true)]
 885                 public void CancelErrorRead ()
 886                 {
 887                         throw new PlatformNotSupportedException ("Process.BeginOutputReadLine is not supported on the current platform.");
 888                 }
 889 #endif // !MONO_FEATURE_PROCESS_START
 890
 891                 /// <devdoc>
 892                 ///     Raise the Exited event, but make sure we don't do it more than once.
 893                 /// </devdoc>
 894                 /// <internalonly/>
 895                 void RaiseOnExited() {
 896                         if (!watchForExit)
 897                                 return;
 898                         if (!raisedOnExited) {
 899                                 lock (this) {
 900                                         if (!raisedOnExited) {
 901                                                 raisedOnExited = true;
 902                                                 OnExited();
 903                                         }
 904                                 }
 905                         }
 906                 }
 907         }
 908 }
 909