if sendRecvMsgFunc.err != nil {
			return
		}
		defer syscall.CloseHandle(s)
		var n uint32
		sendRecvMsgFunc.err = syscall.WSAIoctl(s,
			syscall.SIO_GET_EXTENSION_FUNCTION_POINTER,
			(*byte)(unsafe.Pointer(&WSAID_WSARECVMSG)),
			uint32(unsafe.Sizeof(WSAID_WSARECVMSG)),
			(*byte)(unsafe.Pointer(&sendRecvMsgFunc.recvAddr)),

	switch net {
	case "udp", "udp4", "udp6":
		ret := uint32(0)
		flag := uint32(0)
		size := uint32(unsafe.Sizeof(flag))
		err := syscall.WSAIoctl(fd.Sysfd, syscall.SIO_UDP_CONNRESET, (*byte)(unsafe.Pointer(&flag)), size, nil, 0, &ret, nil, 0)
		if err != nil {
			return "wsaioctl", err
		}
	}
	fd.rop.mode = 'r'
	fd.wop.mode = 'w'
	fd.rop.fd = fd
	fd.wop.fd = fd
	fd.rop.runtimeCtx = fd.pd.runtimeCtx