| private GetSecAttrs ( HandleInheritability inheritability ) : Interop.Kernel32.SECURITY_ATTRIBUTES | ||
| inheritability | HandleInheritability | |
| return | Interop.Kernel32.SECURITY_ATTRIBUTES | |
public AnonymousPipeServerStream(PipeDirection direction, HandleInheritability inheritability, int bufferSize, PipeSecurity pipeSecurity) : base(direction, bufferSize)
{
object obj2;
if (direction == PipeDirection.InOut)
{
throw new NotSupportedException(System.SR.GetString("NotSupported_AnonymousPipeUnidirectional"));
}
if ((inheritability < HandleInheritability.None) || (inheritability > HandleInheritability.Inheritable))
{
throw new ArgumentOutOfRangeException("inheritability", System.SR.GetString("ArgumentOutOfRange_HandleInheritabilityNoneOrInheritable"));
}
Microsoft.Win32.UnsafeNativeMethods.SECURITY_ATTRIBUTES secAttrs = PipeStream.GetSecAttrs(inheritability, pipeSecurity, out obj2);
try
{
this.Create(direction, secAttrs, bufferSize);
}
finally
{
if (obj2 != null)
{
((GCHandle)obj2).Free();
}
}
}
// Creates the anonymous pipe. This overload is used in Mono to implement public constructors.
private void Create(PipeDirection direction, HandleInheritability inheritability, int bufferSize, PipeSecurity pipeSecurity)
{
Debug.Assert(direction != PipeDirection.InOut, "Anonymous pipe direction shouldn't be InOut");
Debug.Assert(bufferSize >= 0, "bufferSize is negative");
bool bSuccess;
SafePipeHandle serverHandle;
SafePipeHandle newServerHandle;
// Create the two pipe handles that make up the anonymous pipe.
GCHandle pinningHandle = default;
try
{
Interop.Kernel32.SECURITY_ATTRIBUTES secAttrs = PipeStream.GetSecAttrs(inheritability, pipeSecurity, ref pinningHandle);
if (direction == PipeDirection.In)
{
bSuccess = Interop.Kernel32.CreatePipe(out serverHandle, out _clientHandle, ref secAttrs, bufferSize);
}
else
{
bSuccess = Interop.Kernel32.CreatePipe(out _clientHandle, out serverHandle, ref secAttrs, bufferSize);
}
}
finally
{
if (pinningHandle.IsAllocated)
{
pinningHandle.Free();
}
}
if (!bSuccess)
{
throw Win32Marshal.GetExceptionForLastWin32Error();
}
// Duplicate the server handle to make it not inheritable. Note: We need to do this so that the child
// process doesn't end up getting another copy of the server handle. If it were to get a copy, the
// OS wouldn't be able to inform the child that the server has closed its handle because it will see
// that there is still one server handle that is open.
bSuccess = Interop.Kernel32.DuplicateHandle(Interop.Kernel32.GetCurrentProcess(), serverHandle, Interop.Kernel32.GetCurrentProcess(),
out newServerHandle, 0, false, Interop.Kernel32.HandleOptions.DUPLICATE_SAME_ACCESS);
if (!bSuccess)
{
throw Win32Marshal.GetExceptionForLastWin32Error();
}
// Close the inheritable server handle.
serverHandle.Dispose();
InitializeHandle(newServerHandle, false, false);
State = PipeState.Connected;
}
public NamedPipeServerStream(string pipeName, PipeDirection direction, int maxNumberOfServerInstances, PipeTransmissionMode transmissionMode, PipeOptions options, int inBufferSize, int outBufferSize, PipeSecurity pipeSecurity, HandleInheritability inheritability, PipeAccessRights additionalAccessRights) : base(direction, transmissionMode, outBufferSize)
{
if (pipeName == null)
{
throw new ArgumentNullException("pipeName");
}
if (pipeName.Length == 0)
{
throw new ArgumentException(System.SR.GetString("Argument_NeedNonemptyPipeName"));
}
if ((options & ~(PipeOptions.Asynchronous | PipeOptions.WriteThrough)) != PipeOptions.None)
{
throw new ArgumentOutOfRangeException("options", System.SR.GetString("ArgumentOutOfRange_OptionsInvalid"));
}
if (inBufferSize < 0)
{
throw new ArgumentOutOfRangeException("inBufferSize", System.SR.GetString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (((maxNumberOfServerInstances < 1) || (maxNumberOfServerInstances > 0xfe)) && (maxNumberOfServerInstances != -1))
{
throw new ArgumentOutOfRangeException("maxNumberOfServerInstances", System.SR.GetString("ArgumentOutOfRange_MaxNumServerInstances"));
}
if ((inheritability < HandleInheritability.None) || (inheritability > HandleInheritability.Inheritable))
{
throw new ArgumentOutOfRangeException("inheritability", System.SR.GetString("ArgumentOutOfRange_HandleInheritabilityNoneOrInheritable"));
}
if ((additionalAccessRights & ~(PipeAccessRights.AccessSystemSecurity | PipeAccessRights.TakeOwnership | PipeAccessRights.ChangePermissions)) != 0)
{
throw new ArgumentOutOfRangeException("additionalAccessRights", System.SR.GetString("ArgumentOutOfRange_AdditionalAccessLimited"));
}
if (Environment.OSVersion.Platform == PlatformID.Win32Windows)
{
throw new PlatformNotSupportedException(System.SR.GetString("PlatformNotSupported_NamedPipeServers"));
}
string fullPath = Path.GetFullPath(@"\\.\pipe\" + pipeName);
if (string.Compare(fullPath, @"\\.\pipe\anonymous", StringComparison.OrdinalIgnoreCase) == 0)
{
throw new ArgumentOutOfRangeException("pipeName", System.SR.GetString("ArgumentOutOfRange_AnonymousReserved"));
}
object pinningHandle = null;
Microsoft.Win32.UnsafeNativeMethods.SECURITY_ATTRIBUTES secAttrs = PipeStream.GetSecAttrs(inheritability, pipeSecurity, out pinningHandle);
try
{
this.Create(fullPath, direction, maxNumberOfServerInstances, transmissionMode, options, inBufferSize, outBufferSize, additionalAccessRights, secAttrs);
}
finally
{
if (pinningHandle != null)
{
((GCHandle)pinningHandle).Free();
}
}
}
public void Connect(int timeout)
{
this.CheckConnectOperationsClient();
if ((timeout < 0) && (timeout != -1))
{
throw new ArgumentOutOfRangeException("timeout", System.SR.GetString("ArgumentOutOfRange_InvalidTimeout"));
}
Microsoft.Win32.UnsafeNativeMethods.SECURITY_ATTRIBUTES secAttrs = PipeStream.GetSecAttrs(this.m_inheritability);
int pipeOptions = (int)this.m_pipeOptions;
if (this.m_impersonationLevel != TokenImpersonationLevel.None)
{
pipeOptions |= 0x100000;
pipeOptions |= ((int)(this.m_impersonationLevel - 1)) << 0x10;
}
int tickCount = Environment.TickCount;
int num3 = 0;
Label_005C:
if (!Microsoft.Win32.UnsafeNativeMethods.WaitNamedPipe(this.m_normalizedPipePath, timeout - num3))
{
int errorCode = Marshal.GetLastWin32Error();
switch (errorCode)
{
case 2:
goto Label_00EF;
case 0:
goto Label_0105;
}
System.IO.__Error.WinIOError(errorCode, string.Empty);
}
SafePipeHandle handle = Microsoft.Win32.UnsafeNativeMethods.CreateNamedPipeClient(this.m_normalizedPipePath, this.m_access, FileShare.None, secAttrs, FileMode.Open, pipeOptions, Microsoft.Win32.UnsafeNativeMethods.NULL);
if (handle.IsInvalid)
{
int num5 = Marshal.GetLastWin32Error();
if (num5 == 0xe7)
{
goto Label_00EF;
}
System.IO.__Error.WinIOError(num5, string.Empty);
}
base.InitializeHandle(handle, false, (this.m_pipeOptions & PipeOptions.Asynchronous) != PipeOptions.None);
base.State = PipeState.Connected;
return;
Label_00EF:
if ((timeout == -1) || ((num3 = Environment.TickCount - tickCount) < timeout))
{
goto Label_005C;
}
Label_0105:
throw new TimeoutException();
}
private void Create(string pipeName, PipeDirection direction, int maxNumberOfServerInstances,
PipeTransmissionMode transmissionMode, PipeOptions options, int inBufferSize, int outBufferSize,
HandleInheritability inheritability)
{
Debug.Assert(pipeName != null && pipeName.Length != 0, "fullPipeName is null or empty");
Debug.Assert(direction >= PipeDirection.In && direction <= PipeDirection.InOut, "invalid pipe direction");
Debug.Assert(inBufferSize >= 0, "inBufferSize is negative");
Debug.Assert(outBufferSize >= 0, "outBufferSize is negative");
Debug.Assert((maxNumberOfServerInstances >= 1 && maxNumberOfServerInstances <= 254) || (maxNumberOfServerInstances == MaxAllowedServerInstances), "maxNumberOfServerInstances is invalid");
Debug.Assert(transmissionMode >= PipeTransmissionMode.Byte && transmissionMode <= PipeTransmissionMode.Message, "transmissionMode is out of range");
string fullPipeName = Path.GetFullPath(@"\\.\pipe\" + pipeName);
// Make sure the pipe name isn't one of our reserved names for anonymous pipes.
if (String.Equals(fullPipeName, @"\\.\pipe\anonymous", StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentOutOfRangeException(nameof(pipeName), SR.ArgumentOutOfRange_AnonymousReserved);
}
int openMode = ((int)direction) |
(maxNumberOfServerInstances == 1 ? Interop.mincore.FileOperations.FILE_FLAG_FIRST_PIPE_INSTANCE : 0) |
(int)options;
// We automatically set the ReadMode to match the TransmissionMode.
int pipeModes = (int)transmissionMode << 2 | (int)transmissionMode << 1;
// Convert -1 to 255 to match win32 (we asserted that it is between -1 and 254).
if (maxNumberOfServerInstances == MaxAllowedServerInstances)
{
maxNumberOfServerInstances = 255;
}
Interop.mincore.SECURITY_ATTRIBUTES secAttrs = PipeStream.GetSecAttrs(inheritability);
SafePipeHandle handle = Interop.mincore.CreateNamedPipe(fullPipeName, openMode, pipeModes,
maxNumberOfServerInstances, outBufferSize, inBufferSize, 0, ref secAttrs);
if (handle.IsInvalid)
{
throw Win32Marshal.GetExceptionForLastWin32Error();
}
InitializeHandle(handle, false, (options & PipeOptions.Asynchronous) != 0);
}
// Waits for a pipe instance to become available. This method may return before WaitForConnection is called
// on the server end, but WaitForConnection will not return until we have returned. Any data written to the
// pipe by us after we have connected but before the server has called WaitForConnection will be available
// to the server after it calls WaitForConnection.
private bool TryConnect(int timeout, CancellationToken cancellationToken)
{
Interop.Kernel32.SECURITY_ATTRIBUTES secAttrs = PipeStream.GetSecAttrs(_inheritability);
// PipeOptions.CurrentUserOnly is special since it doesn't match directly to a corresponding Win32 valid flag.
// Remove it, while keeping others untouched since historically this has been used as a way to pass flags to
// CreateNamedPipeClient that were not defined in the enumeration.
int _pipeFlags = (int)(_pipeOptions & ~PipeOptions.CurrentUserOnly);
if (_impersonationLevel != TokenImpersonationLevel.None)
{
_pipeFlags |= Interop.Kernel32.SecurityOptions.SECURITY_SQOS_PRESENT;
_pipeFlags |= (((int)_impersonationLevel - 1) << 16);
}
int access = 0;
if ((PipeDirection.In & _direction) != 0)
{
access |= Interop.Kernel32.GenericOperations.GENERIC_READ;
}
if ((PipeDirection.Out & _direction) != 0)
{
access |= Interop.Kernel32.GenericOperations.GENERIC_WRITE;
}
// Let's try to connect first
SafePipeHandle handle = Interop.Kernel32.CreateNamedPipeClient(_normalizedPipePath,
access, // read and write access
0, // sharing: none
ref secAttrs, // security attributes
FileMode.Open, // open existing
_pipeFlags, // impersonation flags
IntPtr.Zero); // template file: null
if (handle.IsInvalid)
{
int errorCode = Marshal.GetLastWin32Error();
if (errorCode != Interop.Errors.ERROR_PIPE_BUSY &&
errorCode != Interop.Errors.ERROR_FILE_NOT_FOUND)
{
throw Win32Marshal.GetExceptionForWin32Error(errorCode);
}
if (!Interop.Kernel32.WaitNamedPipe(_normalizedPipePath, timeout))
{
errorCode = Marshal.GetLastWin32Error();
// Server is not yet created or a timeout occurred before a pipe instance was available.
if (errorCode == Interop.Errors.ERROR_FILE_NOT_FOUND ||
errorCode == Interop.Errors.ERROR_SEM_TIMEOUT)
{
return(false);
}
throw Win32Marshal.GetExceptionForWin32Error(errorCode);
}
// Pipe server should be free. Let's try to connect to it.
handle = Interop.Kernel32.CreateNamedPipeClient(_normalizedPipePath,
access, // read and write access
0, // sharing: none
ref secAttrs, // security attributes
FileMode.Open, // open existing
_pipeFlags, // impersonation flags
IntPtr.Zero); // template file: null
if (handle.IsInvalid)
{
errorCode = Marshal.GetLastWin32Error();
// Handle the possible race condition of someone else connecting to the server
// between our calls to WaitNamedPipe & CreateFile.
if (errorCode == Interop.Errors.ERROR_PIPE_BUSY)
{
return(false);
}
throw Win32Marshal.GetExceptionForWin32Error(errorCode);
}
}
// Success!
InitializeHandle(handle, false, (_pipeOptions & PipeOptions.Asynchronous) != 0);
State = PipeState.Connected;
ValidateRemotePipeUser();
return(true);
}
private void Create(string pipeName, PipeDirection direction, int maxNumberOfServerInstances,
PipeTransmissionMode transmissionMode, PipeOptions options, int inBufferSize, int outBufferSize,
HandleInheritability inheritability)
{
Debug.Assert(pipeName != null && pipeName.Length != 0, "fullPipeName is null or empty");
Debug.Assert(direction >= PipeDirection.In && direction <= PipeDirection.InOut, "invalid pipe direction");
Debug.Assert(inBufferSize >= 0, "inBufferSize is negative");
Debug.Assert(outBufferSize >= 0, "outBufferSize is negative");
Debug.Assert((maxNumberOfServerInstances >= 1 && maxNumberOfServerInstances <= 254) || (maxNumberOfServerInstances == MaxAllowedServerInstances), "maxNumberOfServerInstances is invalid");
Debug.Assert(transmissionMode >= PipeTransmissionMode.Byte && transmissionMode <= PipeTransmissionMode.Message, "transmissionMode is out of range");
string fullPipeName = Path.GetFullPath(@"\\.\pipe\" + pipeName);
// Make sure the pipe name isn't one of our reserved names for anonymous pipes.
if (String.Equals(fullPipeName, @"\\.\pipe\anonymous", StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentOutOfRangeException(nameof(pipeName), SR.ArgumentOutOfRange_AnonymousReserved);
}
PipeSecurity pipeSecurity = null;
if (IsCurrentUserOnly)
{
using (WindowsIdentity currentIdentity = WindowsIdentity.GetCurrent())
{
SecurityIdentifier identifier = currentIdentity.Owner;
PipeAccessRule rule = new PipeAccessRule(identifier, PipeAccessRights.ReadWrite, AccessControlType.Allow);
pipeSecurity = new PipeSecurity();
pipeSecurity.AddAccessRule(rule);
pipeSecurity.SetOwner(identifier);
}
// PipeOptions.CurrentUserOnly is special since it doesn't match directly to a corresponding Win32 valid flag.
// Remove it, while keeping others untouched since historically this has been used as a way to pass flags to CreateNamedPipe
// that were not defined in the enumeration.
options &= ~PipeOptions.CurrentUserOnly;
}
int openMode = ((int)direction) |
(maxNumberOfServerInstances == 1 ? Interop.Kernel32.FileOperations.FILE_FLAG_FIRST_PIPE_INSTANCE : 0) |
(int)options;
// We automatically set the ReadMode to match the TransmissionMode.
int pipeModes = (int)transmissionMode << 2 | (int)transmissionMode << 1;
// Convert -1 to 255 to match win32 (we asserted that it is between -1 and 254).
if (maxNumberOfServerInstances == MaxAllowedServerInstances)
{
maxNumberOfServerInstances = 255;
}
var pinningHandle = new GCHandle();
try
{
Interop.Kernel32.SECURITY_ATTRIBUTES secAttrs = PipeStream.GetSecAttrs(inheritability, pipeSecurity, ref pinningHandle);
SafePipeHandle handle = Interop.Kernel32.CreateNamedPipe(fullPipeName, openMode, pipeModes,
maxNumberOfServerInstances, outBufferSize, inBufferSize, 0, ref secAttrs);
if (handle.IsInvalid)
{
throw Win32Marshal.GetExceptionForLastWin32Error();
}
InitializeHandle(handle, false, (options & PipeOptions.Asynchronous) != 0);
}
finally
{
if (pinningHandle.IsAllocated)
{
pinningHandle.Free();
}
}
}
private bool TryConnect(int timeout, CancellationToken cancellationToken)
{
Interop.mincore.SECURITY_ATTRIBUTES secAttrs = PipeStream.GetSecAttrs(_inheritability);
int _pipeFlags = (int)_pipeOptions;
if (_impersonationLevel != TokenImpersonationLevel.None)
{
_pipeFlags |= Interop.mincore.SecurityOptions.SECURITY_SQOS_PRESENT;
_pipeFlags |= (((int)_impersonationLevel - 1) << 16);
}
if (!Interop.mincore.WaitNamedPipe(_normalizedPipePath, timeout))
{
int errorCode = Marshal.GetLastWin32Error();
// Server is not yet created
if (errorCode == Interop.mincore.Errors.ERROR_FILE_NOT_FOUND)
{
return(false);
}
// The timeout has expired.
if (errorCode == Interop.mincore.Errors.ERROR_SUCCESS)
{
if (cancellationToken.CanBeCanceled)
{
// It may not be real timeout.
return(false);
}
throw new TimeoutException();
}
throw Win32Marshal.GetExceptionForWin32Error(errorCode);
}
// Pipe server should be free. Let's try to connect to it.
int access = 0;
if ((PipeDirection.In & _direction) != 0)
{
access |= Interop.mincore.GenericOperations.GENERIC_READ;
}
if ((PipeDirection.Out & _direction) != 0)
{
access |= Interop.mincore.GenericOperations.GENERIC_WRITE;
}
SafePipeHandle handle = Interop.mincore.CreateNamedPipeClient(_normalizedPipePath,
access, // read and write access
0, // sharing: none
ref secAttrs, // security attributes
FileMode.Open, // open existing
_pipeFlags, // impersonation flags
IntPtr.Zero); // template file: null
if (handle.IsInvalid)
{
int errorCode = Marshal.GetLastWin32Error();
// Handle the possible race condition of someone else connecting to the server
// between our calls to WaitNamedPipe & CreateFile.
if (errorCode == Interop.mincore.Errors.ERROR_PIPE_BUSY)
{
return(false);
}
throw Win32Marshal.GetExceptionForWin32Error(errorCode);
}
// Success!
InitializeHandle(handle, false, (_pipeOptions & PipeOptions.Asynchronous) != 0);
State = PipeState.Connected;
return(true);
}
private void ConnectInternal(int timeout, CancellationToken cancellationToken, int startTime)
{
Interop.SECURITY_ATTRIBUTES secAttrs = PipeStream.GetSecAttrs(_inheritability);
int _pipeFlags = (int)_pipeOptions;
if (_impersonationLevel != TokenImpersonationLevel.None)
{
_pipeFlags |= Interop.SECURITY_SQOS_PRESENT;
_pipeFlags |= (((int)_impersonationLevel - 1) << 16);
}
// This is the main connection loop. It will loop until the timeout expires. Most of the
// time, we will be waiting in the WaitNamedPipe win32 blocking function; however, there are
// cases when we will need to loop: 1) The server is not created (WaitNamedPipe returns
// straight away in such cases), and 2) when another client connects to our server in between
// our WaitNamedPipe and CreateFile calls.
int elapsed = 0;
do
{
// We want any other exception and and success to have priority over cancellation.
cancellationToken.ThrowIfCancellationRequested();
// Wait for pipe to become free (this will block unless the pipe does not exist).
int timeLeft = timeout - elapsed;
int waitTime;
if (cancellationToken.CanBeCanceled)
{
waitTime = Math.Min(CancellationCheckInterval, timeLeft);
}
else
{
waitTime = timeLeft;
}
if (!Interop.mincore.WaitNamedPipe(_normalizedPipePath, waitTime))
{
int errorCode = Marshal.GetLastWin32Error();
// Server is not yet created so let's keep looping.
if (errorCode == Interop.ERROR_FILE_NOT_FOUND)
{
continue;
}
// The timeout has expired.
if (errorCode == Interop.ERROR_SUCCESS)
{
if (cancellationToken.CanBeCanceled)
{
// It may not be real timeout and only checking for cancellation
// let the while condition check it and decide
continue;
}
else
{
break;
}
}
throw Win32Marshal.GetExceptionForWin32Error(errorCode);
}
// Pipe server should be free. Let's try to connect to it.
int access = 0;
if ((PipeDirection.In & _direction) != 0)
{
access |= Interop.GENERIC_READ;
}
if ((PipeDirection.Out & _direction) != 0)
{
access |= Interop.GENERIC_WRITE;
}
SafePipeHandle handle = Interop.mincore.CreateNamedPipeClient(_normalizedPipePath,
access, // read and write access
0, // sharing: none
ref secAttrs, // security attributes
FileMode.Open, // open existing
_pipeFlags, // impersonation flags
Interop.NULL); // template file: null
if (handle.IsInvalid)
{
int errorCode = Marshal.GetLastWin32Error();
// Handle the possible race condition of someone else connecting to the server
// between our calls to WaitNamedPipe & CreateFile.
if (errorCode == Interop.ERROR_PIPE_BUSY)
{
continue;
}
throw Win32Marshal.GetExceptionForWin32Error(errorCode);
}
// Success!
InitializeHandle(handle, false, (_pipeOptions & PipeOptions.Asynchronous) != 0);
State = PipeState.Connected;
return;
}while (timeout == Timeout.Infinite || (elapsed = unchecked (Environment.TickCount - startTime)) < timeout);
// BUGBUG: SerialPort does not use unchecked arithmetic when calculating elapsed times. This is needed
// because Environment.TickCount can overflow (though only every 49.7 days).
throw new TimeoutException();
}
// Waits for a pipe instance to become available. This method may return before WaitForConnection is called
// on the server end, but WaitForConnection will not return until we have returned. Any data written to the
// pipe by us after we have connected but before the server has called WaitForConnection will be available
// to the server after it calls WaitForConnection.
private bool TryConnect(int timeout, CancellationToken cancellationToken)
{
Interop.Kernel32.SECURITY_ATTRIBUTES secAttrs = PipeStream.GetSecAttrs(_inheritability);
// PipeOptions.CurrentUserOnly is special since it doesn't match directly to a corresponding Win32 valid flag.
// Remove it, while keeping others untouched since historically this has been used as a way to pass flags to
// CreateNamedPipeClient that were not defined in the enumeration.
int _pipeFlags = (int)(_pipeOptions & ~PipeOptions.CurrentUserOnly);
if (_impersonationLevel != TokenImpersonationLevel.None)
{
_pipeFlags |= Interop.Kernel32.SecurityOptions.SECURITY_SQOS_PRESENT;
_pipeFlags |= (((int)_impersonationLevel - 1) << 16);
}
int access = 0;
if ((PipeDirection.In & _direction) != 0)
{
access |= Interop.Kernel32.GenericOperations.GENERIC_READ;
}
if ((PipeDirection.Out & _direction) != 0)
{
access |= Interop.Kernel32.GenericOperations.GENERIC_WRITE;
}
SafePipeHandle handle = CreateNamedPipeClient(_normalizedPipePath, ref secAttrs, _pipeFlags, access);
if (handle.IsInvalid)
{
int errorCode = Marshal.GetLastPInvokeError();
// CreateFileW: "If the CreateNamedPipe function was not successfully called on the server prior to this operation,
// a pipe will not exist and CreateFile will fail with ERROR_FILE_NOT_FOUND"
// WaitNamedPipeW: "If no instances of the specified named pipe exist,
// the WaitNamedPipe function returns immediately, regardless of the time-out value."
// We know that no instances exist, so we just quit without calling WaitNamedPipeW.
if (errorCode == Interop.Errors.ERROR_FILE_NOT_FOUND)
{
return(false);
}
if (errorCode != Interop.Errors.ERROR_PIPE_BUSY)
{
throw Win32Marshal.GetExceptionForWin32Error(errorCode);
}
if (!Interop.Kernel32.WaitNamedPipe(_normalizedPipePath, timeout))
{
errorCode = Marshal.GetLastPInvokeError();
if (errorCode == Interop.Errors.ERROR_FILE_NOT_FOUND || // server has been closed
errorCode == Interop.Errors.ERROR_SEM_TIMEOUT)
{
return(false);
}
throw Win32Marshal.GetExceptionForWin32Error(errorCode);
}
// Pipe server should be free. Let's try to connect to it.
handle = CreateNamedPipeClient(_normalizedPipePath, ref secAttrs, _pipeFlags, access);
if (handle.IsInvalid)
{
errorCode = Marshal.GetLastPInvokeError();
// WaitNamedPipe: "A subsequent CreateFile call to the pipe can fail,
// because the instance was closed by the server or opened by another client."
if (errorCode == Interop.Errors.ERROR_PIPE_BUSY || // opened by another client
errorCode == Interop.Errors.ERROR_FILE_NOT_FOUND) // server has been closed
{
return(false);
}
throw Win32Marshal.GetExceptionForWin32Error(errorCode);
}
}
// Success!
InitializeHandle(handle, false, (_pipeOptions & PipeOptions.Asynchronous) != 0);
State = PipeState.Connected;
ValidateRemotePipeUser();
return(true);