private void StopWaiting(TaskUtilities.SemaphoreReleaser semaphoreReleaser)
{
Contract.Requires(semaphoreReleaser.IsValid && semaphoreReleaser.CurrentCount == 0);
Analysis.IgnoreArgument(semaphoreReleaser);
if (m_waiting)
{
m_waiting = false;
m_registeredWaitHandle.Unregister(null);
m_processWaitHandle.Dispose();
m_processWaitHandle = null;
m_registeredWaitHandle = null;
}
}
public void Start(
Guid payloadGuid,
ArraySegment <byte> payloadData,
SafeFileHandle inheritableReportHandle,
string dllNameX64,
string dllNameX86)
{
using (m_syncSemaphore.AcquireSemaphore())
{
if (m_starting || m_disposed)
{
throw new InvalidOperationException("Cannot invoke start process more than once or after this instance has been Disposed.");
}
m_starting = true;
// The process creation flags
// We use CREATE_DEFAULT_ERROR_MODE to ensure that the hard error mode of the child process (i.e., GetErrorMode)
// is deterministic. Inheriting error mode is the default, but there may be some concurrent operation that temporarily
// changes it (process global). The CLR has been observed to do so.
// We use CREATE_NO_WINDOW in case BuildXL is attached to a console windows to prevent child processes from messing up
// the console window. If BuildXL itself is started without a console window the flag is not set to prevent creating
// extra conhost.exe processes.
int creationFlags =
((s_consoleWindow == IntPtr.Zero && !this.m_disableConHostSharing) ?
0 : Native.Processes.ProcessUtilities.CREATE_NO_WINDOW) | Native.Processes.ProcessUtilities.CREATE_DEFAULT_ERROR_MODE;
SafeFileHandle standardInputWritePipeHandle = null;
SafeFileHandle standardOutputReadPipeHandle = null;
SafeFileHandle standardErrorReadPipeHandle = null;
try
{
// set up the environment block parameter
var environmentHandle = default(GCHandle);
var payloadHandle = default(GCHandle);
SafeFileHandle hStdInput = null;
SafeFileHandle hStdOutput = null;
SafeFileHandle hStdError = null;
SafeThreadHandle threadHandle = null;
try
{
IntPtr environmentPtr = IntPtr.Zero;
if (m_unicodeEnvironmentBlock != null)
{
creationFlags |= Native.Processes.ProcessUtilities.CREATE_UNICODE_ENVIRONMENT;
environmentHandle = GCHandle.Alloc(m_unicodeEnvironmentBlock, GCHandleType.Pinned);
environmentPtr = environmentHandle.AddrOfPinnedObject();
}
Pipes.CreateInheritablePipe(
Pipes.PipeInheritance.InheritRead,
Pipes.PipeFlags.WriteSideAsync,
readHandle: out hStdInput,
writeHandle: out standardInputWritePipeHandle);
Pipes.CreateInheritablePipe(
Pipes.PipeInheritance.InheritWrite,
Pipes.PipeFlags.ReadSideAsync,
readHandle: out standardOutputReadPipeHandle,
writeHandle: out hStdOutput);
Pipes.CreateInheritablePipe(
Pipes.PipeInheritance.InheritWrite,
Pipes.PipeFlags.ReadSideAsync,
readHandle: out standardErrorReadPipeHandle,
writeHandle: out hStdError);
// We want a per-process job primarily. If nested job support is not available, then we make sure to not have a BuildXL-level job.
if (JobObject.OSSupportsNestedJobs)
{
JobObject.SetTerminateOnCloseOnCurrentProcessJob();
}
// Initialize the injector
m_processInjector = new ProcessTreeContext(payloadGuid, inheritableReportHandle, payloadData, dllNameX64, dllNameX86, m_loggingContext);
// If path remapping is enabled then we wrap the job object in a container, so the filter drivers get
// configured (and they get cleaned up when the container is disposed)
if (m_containerConfiguration.IsIsolationEnabled)
{
m_job = new Container(
name: null,
containerConfiguration: m_containerConfiguration,
loggingContext: m_loggingContext);
}
else
{
m_job = new JobObject(null);
}
// We want the effects of SEM_NOGPFAULTERRORBOX on all children (but can't set that with CreateProcess).
// That's not set otherwise (even if set in this process) due to CREATE_DEFAULT_ERROR_MODE above.
m_job.SetLimitInformation(terminateOnClose: true, failCriticalErrors: false);
m_processInjector.Listen();
if (m_containerConfiguration.IsIsolationEnabled)
{
// After calling SetLimitInformation, start up the container if present
// This will throw if the container is not set up properly
m_job.StartContainerIfPresent();
}
// The call to the CreateDetouredProcess below will add a newly created process to the job.
System.Diagnostics.Stopwatch m_startUpTimeWatch = System.Diagnostics.Stopwatch.StartNew();
var detouredProcessCreationStatus =
Native.Processes.ProcessUtilities.CreateDetouredProcess(
m_commandLine,
creationFlags,
environmentPtr,
m_workingDirectory,
hStdInput,
hStdOutput,
hStdError,
m_job,
m_processInjector.Injector,
m_containerConfiguration.IsIsolationEnabled,
out m_processHandle,
out threadHandle,
out m_processId,
out int errorCode);
m_startUpTimeWatch.Stop();
m_startUpTime = m_startUpTimeWatch.ElapsedMilliseconds;
if (detouredProcessCreationStatus != CreateDetouredProcessStatus.Succeeded)
{
// TODO: Indicating user vs. internal errors (and particular phase failures e.g. adding to job object or injecting detours)
// is good progress on the transparency into these failures. But consider making this indication visible beyond this
// function without throwing exceptions; consider returning a structured value or logging events.
string message;
if (detouredProcessCreationStatus.IsDetoursSpecific())
{
message = string.Format(
CultureInfo.InvariantCulture,
"Internal error during process creation: {0:G}",
detouredProcessCreationStatus);
}
else if (detouredProcessCreationStatus == CreateDetouredProcessStatus.ProcessCreationFailed)
{
message = "Process creation failed";
}
else
{
message = string.Format(
CultureInfo.InvariantCulture,
"Process creation failed: {0:G}",
detouredProcessCreationStatus);
}
throw new BuildXLException(
message,
new NativeWin32Exception(errorCode));
}
// TODO: We should establish good post-conditions for CreateDetouredProcess. As a temporary measure, it would be nice
// to determine if we are sometimes getting invalid process handles with retVal == true. So for now we differentiate
// that possible case with a unique error string.
if (m_processHandle.IsInvalid)
{
throw new BuildXLException("Unable to start or detour a process (process handle invalid)", new NativeWin32Exception(errorCode));
}
}
finally
{
if (environmentHandle.IsAllocated)
{
environmentHandle.Free();
}
if (payloadHandle.IsAllocated)
{
payloadHandle.Free();
}
if (hStdInput != null && !hStdInput.IsInvalid)
{
hStdInput.Dispose();
}
if (hStdOutput != null && !hStdOutput.IsInvalid)
{
hStdOutput.Dispose();
}
if (hStdError != null && !hStdError.IsInvalid)
{
hStdError.Dispose();
}
if (inheritableReportHandle != null && !inheritableReportHandle.IsInvalid)
{
inheritableReportHandle.Dispose();
}
if (threadHandle != null && !threadHandle.IsInvalid)
{
threadHandle.Dispose();
}
}
var standardInputStream = new FileStream(standardInputWritePipeHandle, FileAccess.Write, m_bufferSize, isAsync: true);
m_standardInputWriter = new StreamWriter(standardInputStream, m_standardInputEncoding, m_bufferSize)
{
AutoFlush = true
};
var standardOutputFile = AsyncFileFactory.CreateAsyncFile(
standardOutputReadPipeHandle,
FileDesiredAccess.GenericRead,
ownsHandle: true,
kind: FileKind.Pipe);
m_outputReader = new AsyncPipeReader(standardOutputFile, m_outputDataReceived, m_standardOutputEncoding, m_bufferSize);
m_outputReader.BeginReadLine();
var standardErrorFile = AsyncFileFactory.CreateAsyncFile(
standardErrorReadPipeHandle,
FileDesiredAccess.GenericRead,
ownsHandle: true,
kind: FileKind.Pipe);
m_errorReader = new AsyncPipeReader(standardErrorFile, m_errorDataReceived, m_standardErrorEncoding, m_bufferSize);
m_errorReader.BeginReadLine();
Contract.Assert(!m_processHandle.IsInvalid);
m_processWaitHandle = new SafeWaitHandleFromSafeHandle(m_processHandle);
m_waiting = true;
TimeSpan timeout = m_timeout ?? Timeout.InfiniteTimeSpan;
m_registeredWaitHandle = ThreadPool.RegisterWaitForSingleObject(
m_processWaitHandle,
CompletionCallback,
null,
timeout,
true);
m_started = true;
}
catch (Exception)
{
// Dispose pipe handles in case they are not assigned to streams.
if (m_standardInputWriter == null)
{
standardInputWritePipeHandle?.Dispose();
}
if (m_outputReader == null)
{
standardOutputReadPipeHandle?.Dispose();
}
if (m_errorReader == null)
{
standardErrorReadPipeHandle?.Dispose();
}
throw;
}
}
}