.NET 4.5 and asynchronous Winsock with OVERLAPPED (non IFS Winsock BSPs or LSPs) Ask Question. Any application that uses asynchronous Winsock with OVERLAPPED structure with.NET 4.5 will cause the application not experience the completion of those Winsock call. You can run this command to determine exactly what driver is causing the. There may be some WinSock problems in Windows 10. In my third party task manager, The Winsock IFS driver ws2ifsl.sys is stopped and disabled. I have read the fact that WinSock is important to network stability. Malwarebytes for Mac More. Business Endpoint Security Endpoint Protection Incident Response. TCP/IP protocol driver problem. Sign in to follow this. TCP/IP protocol driver problem. Method 1: Reset Winsock. > > So does AFD. So, AFD is still an analog of sockfs in Windows. > > Since when can you use ReadFile() and WriteFile() on sockets,??? Well, OK, looks like you need some education on what is NT's WinSock. WinSock is the flexible polymorphic implementation of Berkeley sockets API, which is implemented in both user and kernel mode, and which has the addition of MS-specific calls which implement the NT's overlapped IO on sockets. WinSock APIs are in is wsock32.dll/ws2_32.dll, which in turn looks in the registry and load the proper provider DLL. This allows you to implement your own address families _fully in user mode_, or as a mix of your own proprietary user+kernel modules with your own interface between user and kernel part. Actually, WinSock API calls do the following - 'get the provider's function table by socket handle value' and then 'call the provider's function'. This is OK for all Berkeley and WSAxxx calls. But note that ReadFile and WriteFile are always supported on a socket handle - in NT, SOCKET is just a kernel file handle. If we are speaking about send() - then send() is in WinSock, and WinSock is free to implement any semantics on it. But, if we are speaking about ReadFile, then sorry, this API is not in WinSock and the standard NT API which knows nothing on sockets, then only way of customizing ReadFile is to customize its kernel part. To support ReadFile on user-mode WinSock provider DLLs (user-mode address families), there is an auxiliary driver called ws2ifsl.sys. To employ this driver, the provider DLL must call the WinSock's provider interface function 'create IFS handle' or such. This call will create a pair of file handles on ws2ifsl, will create the necessary thread pool for inverted calls, will associate the slave handle with the provider's function table and will return the master handle to the provider DLL. Then the provider DLL returns this handle from its WSPSocket. When the app calls Read/WriteFile on this handle, the calls go directly (no WinSock!) to ws2ifsl.sys in kernel. This module transfers the call to the slave end of its conceptual 'pipe', and the thread pool in ws2_32.dll will consume the call (yes, inverted call) and execute it by calling some WSPXxx in the provider DLL. But this is not the typical scenario of socket address family implementation. The typical scenario is that the address family package has the kernel part, which automatically guarantees that the socket handle will be the file handle on this kernel part. Such packages use 'register IFS handle' instead of 'create IFS handle', their WSPSocket path first does CreateFile on their kernel part, and then 'register IFS handle'. The second step is needed for functions like send() to be dispatched to this provider's WSPSend. Read/WriteFile are automatically delivered to the kernel part. Now note that many address families have lots of common in them - buffering, listen backlog, lingering closes to say a few. This module is called AFD.SYS. So, if the address family implementor needs a kernel part, then the existing AFD.SYS can be reused as a framework. To reuse it, one must program to the lower-edge interface of AFD, which is called TDI. ![]() TDI is much more low-level then socket calls. For instance, the TDI transports usually (surely this is true on TCPIP) have no buffering at all. So, TDI_SEND operation is kept pending _till all ACKs will arrive_. The reason is that, while the ACKs have not arrive yet, there is a possibility that there will be a need for retransmit. Now note that the transport does no buffering, no data copies, so, if it would complete the original send request - it will have the data for the retransmit no more. So, TDI_SEND on unbuffered (the usual way, TCPIP's too) transport pends till all ACKs will arrive, and retransmits are handled off the same send request's buffer.
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