_AcceptOverlappedAsyncResult.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / Sockets / _AcceptOverlappedAsyncResult.cs / 1 / _AcceptOverlappedAsyncResult.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net.Sockets { 
    using System; 
    using System.Net;
    using System.Runtime.InteropServices; 
    using System.Threading;
    using Microsoft.Win32;

    // 
    //  AcceptOverlappedAsyncResult - used to take care of storage for async Socket BeginAccept call.
    // 
    internal class AcceptOverlappedAsyncResult : BaseOverlappedAsyncResult { 

        // 
        // internal class members
        //

        private int             m_LocalBytesTransferred; 
        private Socket          m_ListenSocket;
        private Socket          m_AcceptSocket; 
 
        private     int         m_AddressBufferLength;
        private     byte[]      m_Buffer; 

        // Constructor. We take in the socket that's creating us, the caller's
        // state object, and the buffer on which the I/O will be performed.
        // We save the socket and state, pin the callers's buffer, and allocate 
        // an event for the WaitHandle.
        // 
        internal AcceptOverlappedAsyncResult(Socket listenSocket, Object asyncState, AsyncCallback asyncCallback) : 
            base(listenSocket, asyncState, asyncCallback)
        { 
            m_ListenSocket = listenSocket;
        }

#if !FEATURE_PAL 

        // 
        // This method will be called by us when the IO completes synchronously and 
        // by the ThreadPool when the IO completes asynchronously. (only called on WinNT)
        // 

        internal override object PostCompletion(int numBytes) {
            SocketError errorCode = (SocketError)ErrorCode;
 
            SocketAddress remoteSocketAddress = null;
            if (errorCode==SocketError.Success) { 
 
                m_LocalBytesTransferred = numBytes;
                if(Logging.On)LogBuffer((long)numBytes); 

                //get the endpoint

                remoteSocketAddress = m_ListenSocket.m_RightEndPoint.Serialize(); 

                IntPtr localAddr; 
                int localAddrLength; 
                IntPtr remoteAddr;
 
                UnsafeNclNativeMethods.OSSOCK.GetAcceptExSockaddrs(
                                Marshal.UnsafeAddrOfPinnedArrayElement(m_Buffer, 0),
                                m_Buffer.Length - (m_AddressBufferLength * 2),
                                m_AddressBufferLength, 
                                m_AddressBufferLength,
                                out localAddr, 
                                out localAddrLength, 
                                out remoteAddr,
                                out remoteSocketAddress.m_Size 
                                );
                Marshal.Copy(remoteAddr, remoteSocketAddress.m_Buffer, 0, remoteSocketAddress.m_Size);

                //set the socket context 
                try
                { 
                    IntPtr handle = m_ListenSocket.SafeHandle.DangerousGetHandle(); 

                    errorCode = UnsafeNclNativeMethods.OSSOCK.setsockopt( 
                        m_AcceptSocket.SafeHandle,
                        SocketOptionLevel.Socket,
                        SocketOptionName.UpdateAcceptContext,
                        ref handle, 
                        Marshal.SizeOf(handle));
 
                    if (errorCode == SocketError.SocketError) errorCode = (SocketError) Marshal.GetLastWin32Error(); 
                    GlobalLog.Print("AcceptOverlappedAsyncResult#" + ValidationHelper.HashString(this) + "::PostCallback() setsockopt handle:" + handle.ToString() + " AcceptSocket:" + ValidationHelper.HashString(m_AcceptSocket) + " itsHandle:" + m_AcceptSocket.SafeHandle.DangerousGetHandle().ToString() + " returns:" + errorCode.ToString());
                } 
                catch (ObjectDisposedException)
                {
                    errorCode = SocketError.OperationAborted;
                } 

                ErrorCode = (int)errorCode; 
            } 

            if (errorCode==SocketError.Success) { 
                return m_ListenSocket.UpdateAcceptSocket(m_AcceptSocket, m_ListenSocket.m_RightEndPoint.Create(remoteSocketAddress), false);
            }
            else
                return null; 
        }
 
#endif // !FEATURE_PAL 

 
        //
        // SetUnmanagedStructures -
        // Fills in Overlapped Structures used in an Async Overlapped Winsock call
        //   these calls are outside the runtime and are unmanaged code, so we need 
        //   to prepare specific structures and ints that lie in unmanaged memory
        //   since the Overlapped calls can be Async 
        // 
        internal void SetUnmanagedStructures(byte[] buffer, int addressBufferLength) {
 
            // has to be called first to pin memory
            base.SetUnmanagedStructures(buffer);

            // 
            // Fill in Buffer Array structure that will be used for our send/recv Buffer
            // 
            m_AddressBufferLength = addressBufferLength; 
            m_Buffer = buffer;
        } 

        /*
        // Consider removing.
        internal void SetUnmanagedStructures(byte[] buffer, int addressBufferLength, ref OverlappedCache overlappedCache) 
        {
            SetupCache(ref overlappedCache); 
            SetUnmanagedStructures(buffer, addressBufferLength); 
        }
        */ 

        void LogBuffer(long size) {
            GlobalLog.Assert(Logging.On, "AcceptOverlappedAsyncResult#{0}::LogBuffer()|Logging is off!", ValidationHelper.HashString(this));
            IntPtr pinnedBuffer = Marshal.UnsafeAddrOfPinnedArrayElement(m_Buffer, 0); 
            if (pinnedBuffer != IntPtr.Zero) {
                if (size > -1) { 
                    Logging.Dump(Logging.Sockets, m_ListenSocket, "PostCompletion", pinnedBuffer, (int)Math.Min(size, (long)m_Buffer.Length)); 
                }
                else { 
                    Logging.Dump(Logging.Sockets, m_ListenSocket, "PostCompletion", pinnedBuffer, (int)m_Buffer.Length);
                }
            }
        } 

        internal byte[] Buffer { 
            get { 
                return m_Buffer;
            } 
        }

        internal int BytesTransferred {
            get { 
                return m_LocalBytesTransferred;
            } 
        } 

        internal Socket AcceptSocket 
        {
            set
            {
                m_AcceptSocket = value; 
            }
        } 
    } 
}

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