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 == MaxAllowedServerInstances), "maxNumberOfServerInstances is invalid");
            Debug.Assert(transmissionMode >= PipeTransmissionMode.Byte && transmissionMode <= PipeTransmissionMode.Message, "transmissionMode is out of range");

            if (transmissionMode == PipeTransmissionMode.Message)
            {
                throw new PlatformNotSupportedException(SR.PlatformNotSupported_MessageTransmissionMode);
            }

            // NOTE: We don't have a good way to enforce maxNumberOfServerInstances, and don't currently try.
            // It's a Windows-specific concept.

            _path = GetPipePath(".", pipeName);
            _direction = direction;
            _options = options;
            _inBufferSize = inBufferSize;
            _outBufferSize = outBufferSize;
            _inheritability = inheritability;
        }

        private NamedPipeServerStream(String pipeName, PipeDirection direction, int maxNumberOfServerInstances,
                PipeTransmissionMode transmissionMode, PipeOptions options, int inBufferSize, int outBufferSize,
                HandleInheritability inheritability)
            : base(direction, transmissionMode, outBufferSize)
        {
            if (pipeName == null)
            {
                throw new ArgumentNullException("pipeName");
            }
            if (pipeName.Length == 0)
            {
                throw new ArgumentException(SR.Argument_NeedNonemptyPipeName);
            }
            if ((options & ~(PipeOptions.WriteThrough | PipeOptions.Asynchronous)) != 0)
            {
                throw new ArgumentOutOfRangeException("options", SR.ArgumentOutOfRange_OptionsInvalid);
            }
            if (inBufferSize < 0)
            {
                throw new ArgumentOutOfRangeException("inBufferSize", SR.ArgumentOutOfRange_NeedNonNegNum);
            }
            // win32 allows fixed values of 1-254 or 255 to mean max allowed by system. We expose 255 as -1 (unlimited)
            // through the MaxAllowedServerInstances constant. This is consistent e.g. with -1 as infinite timeout, etc
            if ((maxNumberOfServerInstances < 1 || maxNumberOfServerInstances > 254) && (maxNumberOfServerInstances != MaxAllowedServerInstances))
            {
                throw new ArgumentOutOfRangeException("maxNumberOfServerInstances", SR.ArgumentOutOfRange_MaxNumServerInstances);
            }
            if (inheritability < HandleInheritability.None || inheritability > HandleInheritability.Inheritable)
            {
                throw new ArgumentOutOfRangeException("inheritability", SR.ArgumentOutOfRange_HandleInheritabilityNoneOrInheritable);
            }

            Create(pipeName, direction, maxNumberOfServerInstances, transmissionMode,
                options, inBufferSize, outBufferSize, inheritability);
        }

        private NamedPipeServerStream(String pipeName, PipeDirection direction, int maxNumberOfServerInstances,
                PipeTransmissionMode transmissionMode, PipeOptions options, int inBufferSize, int outBufferSize,
                HandleInheritability inheritability)
            : base(direction, transmissionMode, outBufferSize)
        {
            if (pipeName == null)
            {
                throw new ArgumentNullException("pipeName");
            }
            if (pipeName.Length == 0)
            {
                throw new ArgumentException(SR.Argument_NeedNonemptyPipeName);
            }
            if ((options & ~(PipeOptions.WriteThrough | PipeOptions.Asynchronous)) != 0)
            {
                throw new ArgumentOutOfRangeException("options", SR.ArgumentOutOfRange_OptionsInvalid);
            }
            if (inBufferSize < 0)
            {
                throw new ArgumentOutOfRangeException("inBufferSize", SR.ArgumentOutOfRange_NeedNonNegNum);
            }
            ValidateMaxNumberOfServerInstances(maxNumberOfServerInstances);
            // inheritability will always be None since this private constructor is only called from other constructors from which
            // inheritability is always set to None. Desktop has a public constructor to allow setting it to something else, but Core
            // doesnt.
            if (inheritability < HandleInheritability.None || inheritability > HandleInheritability.Inheritable)
            {
                throw new ArgumentOutOfRangeException("inheritability", SR.ArgumentOutOfRange_HandleInheritabilityNoneOrInheritable);
            }

            Create(pipeName, direction, maxNumberOfServerInstances, transmissionMode,
                options, inBufferSize, outBufferSize, inheritability);
        }

        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 == MaxAllowedServerInstances), "maxNumberOfServerInstances is invalid");
            Debug.Assert(transmissionMode >= PipeTransmissionMode.Byte && transmissionMode <= PipeTransmissionMode.Message, "transmissionMode is out of range");

            if (transmissionMode == PipeTransmissionMode.Message)
            {
                throw new PlatformNotSupportedException();
            }

            // NOTE: We don't have a good way to enforce maxNumberOfServerInstances, and don't currently try.
            // It's a Windows-specific concept.

            // Make sure the FIFO exists, but don't open it until WaitForConnection is called.
            _path = GetPipePath(".", pipeName);
            while (true)
            {
                int result = Interop.libc.mkfifo(_path, (int)Interop.libc.Permissions.S_IRWXU);
                if (result == 0)
                {
                    // The FIFO was successfully created - note that although we create the FIFO here, we don't
                    // ever delete it. If we remove the FIFO we could invalidate other servers that also use it. 
                    // See #2764 for further discussion.
                    break;
                }

                Interop.ErrorInfo errorInfo = Interop.Sys.GetLastErrorInfo();
                if (errorInfo.Error == Interop.Error.EINTR)
                {
                    // interrupted; try again
                    continue;
                }
                else if (errorInfo.Error == Interop.Error.EEXIST)
                {
                    // FIFO already exists; nothing more to do
                    break;
                }
                else
                {
                    // something else; fail
                    throw Interop.GetExceptionForIoErrno(errorInfo, _path);
                }
            }

            // Store the rest of the creation arguments.  They'll be used when we open the connection
            // in WaitForConnection.
            _direction = direction;
            _options = options;
            _inBufferSize = inBufferSize;
            _outBufferSize = outBufferSize;
            _inheritability = inheritability;
        }

        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");

            throw NotImplemented.ByDesign; // TODO: Implement this
        }

		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 (pipeSecurity != null)
				throw ThrowACLException ();
			var rights = ToAccessRights (direction) | additionalAccessRights;
			// FIXME: reject some rights declarations (for ACL).

			if (IsWindows)
				impl = new Win32NamedPipeServer (this, pipeName, maxNumberOfServerInstances, transmissionMode, rights, options, inBufferSize, outBufferSize, inheritability);
			else
				impl = new UnixNamedPipeServer (this, pipeName, maxNumberOfServerInstances, transmissionMode, rights, options, inBufferSize, outBufferSize, inheritability);

			InitializeHandle (impl.Handle, false, (options & PipeOptions.Asynchronous) != PipeOptions.None);
		}

 public NamedPipeClientStream(string serverName, string pipeName, PipeAccessRights desiredAccessRights, PipeOptions options, TokenImpersonationLevel impersonationLevel, HandleInheritability inheritability) : base(DirectionFromRights(desiredAccessRights), 0)
 {
     if (pipeName == null)
     {
         throw new ArgumentNullException("pipeName");
     }
     if (serverName == null)
     {
         throw new ArgumentNullException("serverName", System.SR.GetString("ArgumentNull_ServerName"));
     }
     if (pipeName.Length == 0)
     {
         throw new ArgumentException(System.SR.GetString("Argument_NeedNonemptyPipeName"));
     }
     if (serverName.Length == 0)
     {
         throw new ArgumentException(System.SR.GetString("Argument_EmptyServerName"));
     }
     if ((options & ~(PipeOptions.Asynchronous | PipeOptions.WriteThrough)) != PipeOptions.None)
     {
         throw new ArgumentOutOfRangeException("options", System.SR.GetString("ArgumentOutOfRange_OptionsInvalid"));
     }
     if ((impersonationLevel < TokenImpersonationLevel.None) || (impersonationLevel > TokenImpersonationLevel.Delegation))
     {
         throw new ArgumentOutOfRangeException("impersonationLevel", System.SR.GetString("ArgumentOutOfRange_ImpersonationInvalid"));
     }
     if ((inheritability < HandleInheritability.None) || (inheritability > HandleInheritability.Inheritable))
     {
         throw new ArgumentOutOfRangeException("inheritability", System.SR.GetString("ArgumentOutOfRange_HandleInheritabilityNoneOrInheritable"));
     }
     if ((desiredAccessRights & ~(PipeAccessRights.AccessSystemSecurity | PipeAccessRights.FullControl)) != 0)
     {
         throw new ArgumentOutOfRangeException("desiredAccessRights", System.SR.GetString("ArgumentOutOfRange_InvalidPipeAccessRights"));
     }
     this.m_normalizedPipePath = Path.GetFullPath(@"\\" + serverName + @"\pipe\" + pipeName);
     if (string.Compare(this.m_normalizedPipePath, @"\\.\pipe\anonymous", StringComparison.OrdinalIgnoreCase) == 0)
     {
         throw new ArgumentOutOfRangeException("pipeName", System.SR.GetString("ArgumentOutOfRange_AnonymousReserved"));
     }
     this.m_inheritability = inheritability;
     this.m_impersonationLevel = impersonationLevel;
     this.m_pipeOptions = options;
     this.m_access = (int) desiredAccessRights;
 }

        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("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);
        }

        private NamedPipeServerStream(String pipeName, PipeDirection direction, int maxNumberOfServerInstances,
                PipeTransmissionMode transmissionMode, PipeOptions options, int inBufferSize, int outBufferSize,
                HandleInheritability inheritability)
            : base(direction, transmissionMode, outBufferSize)
        {
            if (pipeName == null)
            {
                throw new ArgumentNullException(nameof(pipeName));
            }
            if (pipeName.Length == 0)
            {
                throw new ArgumentException(SR.Argument_NeedNonemptyPipeName);
            }
            if ((options & ~(PipeOptions.WriteThrough | PipeOptions.Asynchronous)) != 0)
            {
                throw new ArgumentOutOfRangeException(nameof(options), SR.ArgumentOutOfRange_OptionsInvalid);
            }
            if (inBufferSize < 0)
            {
                throw new ArgumentOutOfRangeException(nameof(inBufferSize), SR.ArgumentOutOfRange_NeedNonNegNum);
            }
            if ((maxNumberOfServerInstances < 1 || maxNumberOfServerInstances > 254) && (maxNumberOfServerInstances != MaxAllowedServerInstances))
            {
                // win32 allows fixed values of 1-254 or 255 to mean max allowed by system. We expose 255 as -1 (unlimited)
                // through the MaxAllowedServerInstances constant. This is consistent e.g. with -1 as infinite timeout, etc.
                // We do this check for consistency on Unix, even though maxNumberOfServerInstances is otherwise ignored.
                throw new ArgumentOutOfRangeException(nameof(maxNumberOfServerInstances), SR.ArgumentOutOfRange_MaxNumServerInstances);
            }

            // inheritability will always be None since this private constructor is only called from other constructors from which
            // inheritability is always set to None. Desktop has a public constructor to allow setting it to something else, but Core
            // doesn't.
            if (inheritability < HandleInheritability.None || inheritability > HandleInheritability.Inheritable)
            {
                throw new ArgumentOutOfRangeException(nameof(inheritability), SR.ArgumentOutOfRange_HandleInheritabilityNoneOrInheritable);
            }

            Create(pipeName, direction, maxNumberOfServerInstances, transmissionMode,
                options, inBufferSize, outBufferSize, inheritability);
        }

        internal NamedPipeClientStream(String serverName, String pipeName, PipeDirection direction,
            PipeOptions options, TokenImpersonationLevel impersonationLevel, HandleInheritability inheritability)
            : base(direction, 0)
        {
            if (pipeName == null)
            {
                throw new ArgumentNullException("pipeName");
            }
            if (serverName == null)
            {
                throw new ArgumentNullException("serverName", SR.ArgumentNull_ServerName);
            }
            if (pipeName.Length == 0)
            {
                throw new ArgumentException(SR.Argument_NeedNonemptyPipeName);
            }
            if (serverName.Length == 0)
            {
                throw new ArgumentException(SR.Argument_EmptyServerName);
            }
            if ((options & ~(PipeOptions.WriteThrough | PipeOptions.Asynchronous)) != 0)
            {
                throw new ArgumentOutOfRangeException("options", SR.ArgumentOutOfRange_OptionsInvalid);
            }
            if (impersonationLevel < TokenImpersonationLevel.None || impersonationLevel > TokenImpersonationLevel.Delegation)
            {
                throw new ArgumentOutOfRangeException("impersonationLevel", SR.ArgumentOutOfRange_ImpersonationInvalid);
            }
            if (inheritability < HandleInheritability.None || inheritability > HandleInheritability.Inheritable)
            {
                throw new ArgumentOutOfRangeException("inheritability", SR.ArgumentOutOfRange_HandleInheritabilityNoneOrInheritable);
            }

            _normalizedPipePath = GetPipePath(serverName, pipeName);
            _direction = direction;
            _inheritability = inheritability;
            _impersonationLevel = impersonationLevel;
            _pipeOptions = options;
        }

		// .ctor without handle - create new
		public UnixNamedPipeServer (NamedPipeServerStream owner, string pipeName, int maxNumberOfServerInstances,
		                             PipeTransmissionMode transmissionMode, PipeAccessRights rights, PipeOptions options,
		                            int inBufferSize, int outBufferSize, HandleInheritability inheritability)
		{
			string name = Path.Combine ("/var/tmp/", pipeName);
			EnsureTargetFile (name);

			RightsToAccess (rights);

			ValidateOptions (options, owner.TransmissionMode);

			// FIXME: maxNumberOfServerInstances, modes, sizes, handle inheritability
			
			var fs = new FileStream (name, FileMode.Open, RightsToFileAccess (rights), FileShare.ReadWrite);
			handle = new SafePipeHandle (fs.Handle, false);
			owner.Stream = fs;
			should_close_handle = true;
		}

		protected void ValidateOptions (PipeOptions options, PipeTransmissionMode mode)
		{
			if ((options & PipeOptions.WriteThrough) != 0)
				throw new NotImplementedException ("WriteThrough is not supported");

			if ((mode & PipeTransmissionMode.Message) != 0)
				throw new NotImplementedException ("Message transmission mode is not supported");
			if ((options & PipeOptions.Asynchronous) != 0) // FIXME: use O_NONBLOCK?
				throw new NotImplementedException ("Asynchronous pipe mode is not supported");
		}

		// .ctor without handle - create new
		public UnixNamedPipeClient (NamedPipeClientStream owner, string serverName, string pipeName,
		                             PipeAccessRights desiredAccessRights, PipeOptions options, HandleInheritability inheritability)
		{
			this.owner = owner;

			if (serverName != "." && !Dns.GetHostEntry (serverName).AddressList.Contains (IPAddress.Loopback))
				throw new NotImplementedException ("Unix fifo does not support remote server connection");
			var name = Path.Combine ("/var/tmp/", pipeName);
			EnsureTargetFile (name);
			
			RightsToAccess (desiredAccessRights);
			
			ValidateOptions (options, owner.TransmissionMode);
			
			// FIXME: handle inheritability

			opener = delegate {
				var fs = new FileStream (name, FileMode.Open, RightsToFileAccess (desiredAccessRights), FileShare.ReadWrite);
				owner.Stream = fs;
				handle = new SafePipeHandle (fs.Handle, false);
			};
		}

        private void Create(String fullPipeName, PipeDirection direction, int maxNumberOfServerInstances,
                PipeTransmissionMode transmissionMode, PipeOptions options, int inBufferSize, int outBufferSize,
                PipeAccessRights rights, UnsafeNativeMethods.SECURITY_ATTRIBUTES secAttrs) {
            Debug.Assert(fullPipeName != null && fullPipeName.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");

            int openMode = ((int)direction) |
                           (maxNumberOfServerInstances == 1 ? UnsafeNativeMethods.FILE_FLAG_FIRST_PIPE_INSTANCE : 0) |
                           (int)options |
                           (int)rights;

            // 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;
            }

            SafePipeHandle handle = UnsafeNativeMethods.CreateNamedPipe(fullPipeName, openMode, pipeModes,
                    maxNumberOfServerInstances, outBufferSize, inBufferSize, 0, secAttrs);

            if (handle.IsInvalid) {
                __Error.WinIOError(Marshal.GetLastWin32Error(), String.Empty);
            }

            InitializeHandle(handle, false, (options & PipeOptions.Asynchronous) != 0);
        }

		public NamedPipeClientStream (string serverName, string pipeName, PipeAccessRights desiredAccessRights, PipeOptions options, TokenImpersonationLevel impersonationLevel, HandleInheritability inheritability)
			: base (ToDirection (desiredAccessRights), DefaultBufferSize)
		{
			if (impersonationLevel != TokenImpersonationLevel.None ||
			    inheritability != HandleInheritability.None)
				throw ThrowACLException ();

			if (IsWindows)
				impl = new Win32NamedPipeClient (this, serverName, pipeName, desiredAccessRights, options, inheritability);
			else
				impl = new UnixNamedPipeClient (this, serverName, pipeName, desiredAccessRights, options, inheritability);
		}

		public NamedPipeServerStream (string pipeName, PipeDirection direction, int maxNumberOfServerInstances, PipeTransmissionMode transmissionMode, PipeOptions options, int inBufferSize, int outBufferSize)
#if MOBILE		
			: base (direction, inBufferSize)
		{
			throw new NotImplementedException ();
		}

        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(SR.GetString(SR.Argument_NeedNonemptyPipeName));
            }
            if ((options & ~(PipeOptions.WriteThrough | PipeOptions.Asynchronous)) != 0) {
                throw new ArgumentOutOfRangeException("options", SR.GetString(SR.ArgumentOutOfRange_OptionsInvalid));
            }
            if (inBufferSize < 0) {
                throw new ArgumentOutOfRangeException("inBufferSize", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNum));
            }
            // win32 allows fixed values of 1-254 or 255 to mean max allowed by system. We expose 255 as -1 (unlimited)
            // through the MaxAllowedServerInstances constant. This is consistent e.g. with -1 as infinite timeout, etc
            if ((maxNumberOfServerInstances < 1 || maxNumberOfServerInstances > 254) && (maxNumberOfServerInstances != MaxAllowedServerInstances)) {
                throw new ArgumentOutOfRangeException("maxNumberOfServerInstances", SR.GetString(SR.ArgumentOutOfRange_MaxNumServerInstances));
            }
            if (inheritability < HandleInheritability.None || inheritability > HandleInheritability.Inheritable) {
                throw new ArgumentOutOfRangeException("inheritability", SR.GetString(SR.ArgumentOutOfRange_HandleInheritabilityNoneOrInheritable));
            }
            // ChangePermissions, TakeOwnership, and AccessSystemSecurity are only legal values user may provide;
            // internally this is set to 0 if not provided. This handles both cases.
            if ((additionalAccessRights & ~(PipeAccessRights.ChangePermissions | PipeAccessRights.TakeOwnership |
                       PipeAccessRights.AccessSystemSecurity)) != 0) {
                throw new ArgumentOutOfRangeException("additionalAccessRights", SR.GetString(SR.ArgumentOutOfRange_AdditionalAccessLimited));
            }

            // Named Pipe Servers require Windows NT
            if (Environment.OSVersion.Platform == PlatformID.Win32Windows) {
                throw new PlatformNotSupportedException(SR.GetString(SR.PlatformNotSupported_NamedPipeServers));
            }

            string normalizedPipePath = Path.GetFullPath(@"\\.\pipe\" + pipeName);

            // Make sure the pipe name isn't one of our reserved names for anonymous pipes.
            if (String.Compare(normalizedPipePath, @"\\.\pipe\anonymous", StringComparison.OrdinalIgnoreCase) == 0) {
                throw new ArgumentOutOfRangeException("pipeName", SR.GetString(SR.ArgumentOutOfRange_AnonymousReserved));
            }
            
            Object pinningHandle = null;
            UnsafeNativeMethods.SECURITY_ATTRIBUTES secAttrs = PipeStream.GetSecAttrs(inheritability, pipeSecurity, out pinningHandle);

            try {
                Create(normalizedPipePath, direction, maxNumberOfServerInstances, transmissionMode,
                        options, inBufferSize, outBufferSize, additionalAccessRights, secAttrs);
            }
            finally {
                if (pinningHandle != null) {
                    GCHandle pinHandle = (GCHandle)pinningHandle;
                    pinHandle.Free();
                }
            }
        }

 protected override NamedPipePair CreateNamedPipePair(PipeOptions serverOptions, PipeOptions clientOptions)
 {
     NamedPipePair ret = new NamedPipePair();
     string pipeName = GetUniquePipeName();
     ret.serverStream = new NamedPipeServerStream(pipeName, PipeDirection.In, 1, PipeTransmissionMode.Byte, serverOptions);
     ret.clientStream = new NamedPipeClientStream(".", pipeName, PipeDirection.Out, clientOptions);
     ret.writeToServer = false;
     return ret;
 }

 public NamedPipeServerStream(string pipeName, PipeDirection direction, int maxNumberOfServerInstances, PipeTransmissionMode transmissionMode, PipeOptions options, int inBufferSize, int outBufferSize, PipeSecurity pipeSecurity, HandleInheritability inheritability, PipeAccessRights additionalAccessRights) : base (default(PipeDirection), default(int))
 {
   Contract.Ensures(1 <= pipeName.Length);
 }

		public NamedPipeClientStream (string serverName, string pipeName, PipeDirection direction, PipeOptions options, TokenImpersonationLevel impersonationLevel, HandleInheritability inheritability)
#if MOBILE
			: base (direction, DefaultBufferSize)
		{
			throw new NotImplementedException ();
		}