1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package libcore.io; 18 19 import java.io.FileDescriptor; 20 21 /** 22 * Corresponds to C's {@code struct pollfd} from 23 * <a href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/poll.h.html"><poll.h></a> 24 */ 25 public final class StructPollfd { 26 /** The file descriptor to poll. */ 27 public FileDescriptor fd; 28 29 /** 30 * The events we're interested in. POLLIN corresponds to being in select(2)'s read fd set, 31 * POLLOUT to the write fd set. 32 */ 33 public short events; 34 35 /** The events that actually happened. */ 36 public short revents; 37 38 /** 39 * A non-standard extension that lets callers conveniently map back to the object 40 * their fd belongs to. This is used by Selector, for example, to associate each 41 * FileDescriptor with the corresponding SelectionKey. 42 */ 43 public Object userData; 44 toString()45 @Override public String toString() { 46 return "StructPollfd[fd=" + fd + ",events=" + events + ",revents=" + revents + "]"; 47 } 48 } 49