public static IntPtr OpenAppendFile(string fileName)
{
if (fileName == null)
{
throw new ArgumentNullException("fileName");
}
Win32.SecurityAttributes securityAttributes = new Win32.SecurityAttributes();
securityAttributes.Initialize();
IntPtr handle = Win32.CreateFile(fileName,
Win32.FileAccess.AppendData,
Win32.FileShare.Read,
ref securityAttributes,
Win32.FileCreateDisposition.OpenAlways,
Win32.FileAttributes.Normal, IntPtr.Zero);
if (handle == IntPtr.Zero)
{
int lastError = Marshal.GetLastWin32Error();
throw new Win32Exception(lastError,
string.Format(CouldNotOpenFileErrorFormat, fileName, lastError));
}
return(handle);
}
void StartProcess()
{
IntPtr stdin = IntPtr.Zero;
IntPtr stdoutRead = IntPtr.Zero;
IntPtr stdoutWrite = IntPtr.Zero;
IntPtr stderr = IntPtr.Zero;
try
{
Win32.StartupInfo startupInfo = new Win32.StartupInfo();
startupInfo.Initialize();
startupInfo.Flags = Win32.StartProcessFlags.UseStdHandles;
#region Set stdin
{
if (RedirectedStandardInput != null)
{
stdin = RedirectedStandardInput.ReleaseStandardOutputReadHandle();
Helper.EnsureHandleInheritable(stdin);
}
else
{
/* Duplicate the handle so that
* the cleaning logic is unified.
*/
stdin = Helper.DuplicateHandleForInheritance(
Win32.GetStdHandle(Win32.StandardHandleId.StandardInput));
}
startupInfo.StandardInput = stdin;
}
#endregion Set stdin
#region Set stdout
{
Win32.SecurityAttributes pipeAttributes = new Win32.SecurityAttributes();
pipeAttributes.Initialize();
if (Win32.CreatePipe(out stdoutRead, out stdoutWrite,
ref pipeAttributes, 4096) == Win32.Bool.False)
{
stdoutRead = IntPtr.Zero;
stdoutWrite = IntPtr.Zero;
int lastError = Marshal.GetLastWin32Error();
throw new Win32Exception(lastError,
string.Format(CouldNotCreatePipeErrorFormat, lastError));
}
Helper.EnsureHandleInheritable(stdoutWrite);
startupInfo.StandardOutput = stdoutWrite;
}
#endregion Set stdout
#region Set stderr
{
if (RedirectedStandardError != null)
{
stderr = standardErrorAppend
? Helper.OpenAppendFile(RedirectedStandardError)
: Helper.OpenTruncatedFile(RedirectedStandardError);
Helper.EnsureHandleInheritable(stderr);
}
else
{
stderr = Helper.DuplicateHandleForInheritance(
Win32.GetStdHandle(Win32.StandardHandleId.StandardError));
}
startupInfo.StandardError = stderr;
}
#endregion Set stderr
Win32.ProcessInformation processInformation;
/* Create the process suspended,
* and resume it only after we
* have started waiting for it.
*/
if (Win32.CreateProcess(null,
BuildCommandLine(),
IntPtr.Zero, IntPtr.Zero,
Win32.Bool.True, Win32.ProcessCreationFlags.CreateSuspended, IntPtr.Zero,
InitialWorkingDirectory,
ref startupInfo, out processInformation)
== Win32.Bool.False)
{
int lastError = Marshal.GetLastWin32Error();
throw new Win32Exception(lastError,
string.Format(CouldNotCreateProcessErrorFormat, lastError));
}
hasExited = false;
processHandle = processInformation.HandleToProcess;
ProcessId = processInformation.ProcessId;
new Thread(WaitForProcessExitWorker).Start(this);
Win32.ResumeThread(processInformation.HandleToThread);
Win32.CloseHandle(processInformation.HandleToThread);
stdoutReadHandle = stdoutRead;
/* Prevent this very handle from being
* closed. Other handles are useless now
* and will be closed in "finally".
*/
stdoutRead = IntPtr.Zero;
}
finally
{
if (stdin != IntPtr.Zero)
{
Win32.CloseHandle(stdin);
}
if (stdoutRead != IntPtr.Zero)
{
Win32.CloseHandle(stdoutRead);
}
if (stdoutWrite != IntPtr.Zero)
{
Win32.CloseHandle(stdoutWrite);
}
if (stderr != IntPtr.Zero)
{
Win32.CloseHandle(stderr);
}
}
}