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/*
* Copyright (C) 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.net.module.util.async;
import android.os.ParcelFileDescriptor;
import android.system.StructPollfd;
import java.io.FileDescriptor;
import java.io.IOException;
/**
* Provides access to all relevant OS functions..
*
* @hide
*/
public abstract class OsAccess {
/** Closes the given file, suppressing IO exceptions. */
public abstract void close(ParcelFileDescriptor fd);
/** Returns file name for debugging purposes. */
public abstract String getFileDebugName(ParcelFileDescriptor fd);
/** Returns inner FileDescriptor instance. */
public abstract FileDescriptor getInnerFileDescriptor(ParcelFileDescriptor fd);
/**
* Reads available data from the given non-blocking file descriptor.
*
* Returns zero if there's no data to read at this moment.
* Returns -1 if the file has reached its end or the input stream has been closed.
* Otherwise returns the number of bytes read.
*/
public abstract int read(FileDescriptor fd, byte[] buffer, int pos, int len)
throws IOException;
/**
* Writes data into the given non-blocking file descriptor.
*
* Returns zero if there's no buffer space to write to at this moment.
* Otherwise returns the number of bytes written.
*/
public abstract int write(FileDescriptor fd, byte[] buffer, int pos, int len)
throws IOException;
public abstract long monotonicTimeMillis();
public abstract void setNonBlocking(FileDescriptor fd) throws IOException;
public abstract ParcelFileDescriptor[] pipe() throws IOException;
public abstract int poll(StructPollfd[] fds, int timeoutMs) throws IOException;
public abstract short getPollInMask();
public abstract short getPollOutMask();
}
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