50 lines
1.5 KiB
Java
50 lines
1.5 KiB
Java
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/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.system;
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import java.io.FileDescriptor;
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import libcore.util.Objects;
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/**
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* Used as an in/out parameter to {@link Os#poll}.
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* Corresponds to C's {@code struct pollfd} from {@code <poll.h>}.
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*/
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public final class StructPollfd {
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/** The file descriptor to poll. */
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public FileDescriptor fd;
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/**
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* The events we're interested in. POLLIN corresponds to being in select(2)'s read fd set,
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* POLLOUT to the write fd set.
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*/
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public short events;
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/** The events that actually happened. */
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public short revents;
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/**
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* A non-standard extension that lets callers conveniently map back to the object
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* their fd belongs to. This is used by Selector, for example, to associate each
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* FileDescriptor with the corresponding SelectionKey.
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*/
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public Object userData;
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@Override public String toString() {
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return Objects.toString(this);
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}
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}
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