| /* |
| * 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(); |
| } |