System.Net.Sockets.SocketPal.Poll C# (CSharp) Метод

        public static unsafe SocketError Poll(SafeCloseSocket handle, int microseconds, SelectMode mode, out bool status)
        {
            Interop.Sys.PollEvents inEvent = Interop.Sys.PollEvents.POLLNONE;
            switch (mode)
            {
                case SelectMode.SelectRead: inEvent = Interop.Sys.PollEvents.POLLIN; break;
                case SelectMode.SelectWrite: inEvent = Interop.Sys.PollEvents.POLLOUT; break;
                case SelectMode.SelectError: inEvent = Interop.Sys.PollEvents.POLLPRI; break;
            }

            int milliseconds = microseconds == -1 ? -1 : microseconds / 1000;

            Interop.Sys.PollEvents outEvents;
            Interop.Error err = Interop.Sys.Poll(handle, inEvent, milliseconds, out outEvents);
            if (err != Interop.Error.SUCCESS)
            {
                status = false;
                return GetSocketErrorForErrorCode(err);
            }

            switch (mode)
            {
                case SelectMode.SelectRead: status = (outEvents & (Interop.Sys.PollEvents.POLLIN | Interop.Sys.PollEvents.POLLHUP)) != 0; break;
                case SelectMode.SelectWrite: status = (outEvents & Interop.Sys.PollEvents.POLLOUT) != 0; break;
                case SelectMode.SelectError: status = (outEvents & (Interop.Sys.PollEvents.POLLERR | Interop.Sys.PollEvents.POLLPRI)) != 0; break;
                default: status = false; break;
            }
            return SocketError.Success;
        }