/// <summary>
/// Spawns a new managed process using Win32 native functions.
/// </summary>
/// <param name="Group">The managed process group to add to</param>
/// <param name="FileName">Path to the executable to be run</param>
/// <param name="CommandLine">Command line arguments for the process</param>
/// <param name="WorkingDirectory">Working directory for the new process. May be null to use the current working directory.</param>
/// <param name="Environment">Environment variables for the new process. May be null, in which case the current process' environment is inherited</param>
/// <param name="Input">Text to be passed via stdin to the new process. May be null.</param>
/// <param name="Priority">Priority for the child process</param>
private void CreateManagedProcessPortable(ManagedProcessGroup Group, string FileName, string CommandLine, string WorkingDirectory, IReadOnlyDictionary <string, string> Environment, byte[] Input, ProcessPriorityClass Priority)
{
// Fallback for Mono platforms
FrameworkProcess = new Process();
FrameworkProcess.StartInfo.FileName = FileName;
FrameworkProcess.StartInfo.Arguments = CommandLine;
FrameworkProcess.StartInfo.WorkingDirectory = WorkingDirectory;
FrameworkProcess.StartInfo.RedirectStandardInput = true;
FrameworkProcess.StartInfo.RedirectStandardOutput = true;
FrameworkProcess.StartInfo.UseShellExecute = false;
FrameworkProcess.StartInfo.CreateNoWindow = true;
if (Environment != null)
{
foreach (KeyValuePair <string, string> Pair in Environment)
{
FrameworkProcess.StartInfo.EnvironmentVariables[Pair.Key] = Pair.Value;
}
}
FrameworkProcess.Start();
try
{
FrameworkProcess.PriorityClass = Priority;
}
catch
{
}
// If we have any input text, write it to stdin now
if (Input != null)
{
FrameworkProcess.StandardInput.BaseStream.Write(Input, 0, Input.Length);
FrameworkProcess.StandardInput.BaseStream.Close();
}
}
/// <summary>
/// Spawns a new managed process.
/// </summary>
/// <param name="Group">The managed process group to add to</param>
/// <param name="FileName">Path to the executable to be run</param>
/// <param name="CommandLine">Command line arguments for the process</param>
/// <param name="WorkingDirectory">Working directory for the new process. May be null to use the current working directory.</param>
/// <param name="Environment">Environment variables for the new process. May be null, in which case the current process' environment is inherited</param>
/// <param name="Input">Text to be passed via stdin to the new process. May be null.</param>
/// <param name="Priority">Priority for the child process</param>
public ManagedProcess(ManagedProcessGroup Group, string FileName, string CommandLine, string WorkingDirectory, IReadOnlyDictionary <string, string> Environment, byte[] Input, ProcessPriorityClass Priority)
{
// Create the child process
// NOTE: Child process must be created in a separate method to avoid stomping exception callstacks (https://stackoverflow.com/a/2494150)
try
{
if (ManagedProcessGroup.SupportsJobObjects)
{
CreateManagedProcessWin32(Group, FileName, CommandLine, WorkingDirectory, Environment, Input, Priority);
}
else
{
CreateManagedProcessPortable(Group, FileName, CommandLine, WorkingDirectory, Environment, Input, Priority);
}
}
catch (Exception Ex)
{
ExceptionUtils.AddContext(Ex, "while launching {0} {1}", FileName, CommandLine);
throw;
}
}
/// <summary>
/// Spawns a new managed process.
/// </summary>
/// <param name="Group">The managed process group to add to</param>
/// <param name="FileName">Path to the executable to be run</param>
/// <param name="CommandLine">Command line arguments for the process</param>
/// <param name="WorkingDirectory">Working directory for the new process. May be null to use the current working directory.</param>
/// <param name="Environment">Environment variables for the new process. May be null, in which case the current process' environment is inherited</param>
/// <param name="Input">Text to be passed via stdin to the new process. May be null.</param>
public ManagedProcess(ManagedProcessGroup Group, string FileName, string CommandLine, string WorkingDirectory, IReadOnlyDictionary <string, string> Environment, string Input, ManagedProcessPriority Priority)
{
// Create the child process
IntPtr EnvironmentBlock = IntPtr.Zero;
try
{
// Create the environment block for the child process, if necessary.
if (Environment != null)
{
// The native format for the environment block is a sequence of null terminated strings with a final null terminator.
List <byte> EnvironmentBytes = new List <byte>();
foreach (KeyValuePair <string, string> Pair in Environment)
{
EnvironmentBytes.AddRange(Encoding.UTF8.GetBytes(Pair.Key));
EnvironmentBytes.Add((byte)'=');
EnvironmentBytes.AddRange(Encoding.UTF8.GetBytes(Pair.Value));
EnvironmentBytes.Add((byte)0);
}
EnvironmentBytes.Add((byte)0);
// Allocate an unmanaged block of memory to store it.
EnvironmentBlock = Marshal.AllocHGlobal(EnvironmentBytes.Count);
Marshal.Copy(EnvironmentBytes.ToArray(), 0, EnvironmentBlock, EnvironmentBytes.Count);
}
PROCESS_INFORMATION ProcessInfo = new PROCESS_INFORMATION();
try
{
// Get the flags to create the new process
ProcessCreationFlags Flags = ProcessCreationFlags.CREATE_NO_WINDOW | ProcessCreationFlags.CREATE_SUSPENDED;
switch (Priority)
{
case ManagedProcessPriority.BelowNormal:
Flags |= ProcessCreationFlags.BELOW_NORMAL_PRIORITY_CLASS;
break;
case ManagedProcessPriority.Normal:
Flags |= ProcessCreationFlags.NORMAL_PRIORITY_CLASS;
break;
case ManagedProcessPriority.AboveNormal:
Flags |= ProcessCreationFlags.ABOVE_NORMAL_PRIORITY_CLASS;
break;
}
// Acquire a global lock before creating inheritable handles. If multiple threads create inheritable handles at the same time, and child processes will inherit them all.
// Since we need to wait for output pipes to be closed (in order to consume all output), this can result in output reads not returning until all processes with the same
// inherited handles are closed.
lock (LockObject)
{
SafeFileHandle StdInRead = null;
SafeFileHandle StdOutWrite = null;
SafeWaitHandle StdErrWrite = null;
try
{
// Create stdin and stdout pipes for the child process. We'll close the handles for the child process' ends after it's been created.
SECURITY_ATTRIBUTES SecurityAttributes = new SECURITY_ATTRIBUTES();
SecurityAttributes.nLength = Marshal.SizeOf(SecurityAttributes);
SecurityAttributes.bInheritHandle = 1;
if (CreatePipe(out StdInRead, out StdInWrite, SecurityAttributes, 0) == 0 || SetHandleInformation(StdInWrite, HANDLE_FLAG_INHERIT, 0) == 0)
{
throw new Win32Exception();
}
if (CreatePipe(out StdOutRead, out StdOutWrite, SecurityAttributes, 0) == 0 || SetHandleInformation(StdOutRead, HANDLE_FLAG_INHERIT, 0) == 0)
{
throw new Win32Exception();
}
if (DuplicateHandle(GetCurrentProcess(), StdOutWrite, GetCurrentProcess(), out StdErrWrite, 0, true, DUPLICATE_SAME_ACCESS) == 0)
{
throw new Win32Exception();
}
// Create the new process as suspended, so we can modify it before it starts executing (and potentially preempting us)
STARTUPINFO StartupInfo = new STARTUPINFO();
StartupInfo.cb = Marshal.SizeOf(StartupInfo);
StartupInfo.hStdInput = StdInRead;
StartupInfo.hStdOutput = StdOutWrite;
StartupInfo.hStdError = StdErrWrite;
StartupInfo.dwFlags = STARTF_USESTDHANDLES;
if (CreateProcess(null, new StringBuilder("\"" + FileName + "\" " + CommandLine), IntPtr.Zero, IntPtr.Zero, true, Flags, EnvironmentBlock, WorkingDirectory, StartupInfo, ProcessInfo) == 0)
{
throw new Win32Exception();
}
}
finally
{
// Close the write ends of the handle. We don't want any other process to be able to inherit these.
if (StdInRead != null)
{
StdInRead.Dispose();
StdInRead = null;
}
if (StdOutWrite != null)
{
StdOutWrite.Dispose();
StdOutWrite = null;
}
if (StdErrWrite != null)
{
StdErrWrite.Dispose();
StdErrWrite = null;
}
}
}
// Add it to our job object
if (AssignProcessToJobObject(Group.JobHandle, ProcessInfo.hProcess) == 0)
{
// Support for nested job objects was only addeed in Windows 8; prior to that, assigning processes to job objects would fail. Figure out if we're already in a job, and ignore the error if we are.
int OriginalError = Marshal.GetLastWin32Error();
bool bProcessInJob;
IsProcessInJob(GetCurrentProcess(), IntPtr.Zero, out bProcessInJob);
if (!bProcessInJob)
{
throw new Win32Exception(OriginalError);
}
}
// Allow the thread to start running
if (ResumeThread(ProcessInfo.hThread) == -1)
{
throw new Win32Exception();
}
// If we have any input text, write it to stdin now
using (StreamWriter StdInWriter = new StreamWriter(new FileStream(StdInWrite, FileAccess.Write, 4096, false), Console.InputEncoding, 4096))
{
if (!String.IsNullOrEmpty(Input))
{
StdInWriter.WriteLine(Input);
StdInWriter.Flush();
}
}
// Create the stream objects for reading the process output
InnerStream = new FileStream(StdOutRead, FileAccess.Read, 4096, false);
ReadStream = new StreamReader(InnerStream, Console.OutputEncoding);
// Wrap the process handle in a SafeFileHandle
ProcessHandle = new SafeFileHandle(ProcessInfo.hProcess, true);
}
finally
{
if (ProcessInfo.hProcess != IntPtr.Zero && ProcessHandle == null)
{
CloseHandle(ProcessInfo.hProcess);
}
if (ProcessInfo.hThread != IntPtr.Zero)
{
CloseHandle(ProcessInfo.hThread);
}
}
}
finally
{
if (EnvironmentBlock != IntPtr.Zero)
{
Marshal.FreeHGlobal(EnvironmentBlock);
EnvironmentBlock = IntPtr.Zero;
}
}
}
