| /* |
| * Copyright (C) 2016 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.server; |
| |
| import android.content.Context; |
| import android.content.pm.PackageManager; |
| import android.content.res.Resources; |
| import android.util.EventLog; |
| import android.util.Slog; |
| import android.os.Binder; |
| import android.os.Build; |
| import android.system.ErrnoException; |
| import android.system.Os; |
| import android.system.OsConstants; |
| import android.system.StructStat; |
| |
| import java.util.ArrayList; |
| import java.io.FileDescriptor; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| |
| /** |
| * <p>PinnerService pins important files for key processes in memory.</p> |
| * <p>Files to pin are specified in the config_defaultPinnerServiceFiles |
| * overlay. </p> |
| */ |
| public final class PinnerService extends SystemService { |
| private static final boolean DEBUG = false; |
| private static final String TAG = "PinnerService"; |
| |
| private final Context mContext; |
| private final ArrayList<String> mPinnedFiles = new ArrayList<String>(); |
| |
| private BinderService mBinderService; |
| |
| |
| public PinnerService(Context context) { |
| super(context); |
| |
| mContext = context; |
| |
| } |
| |
| @Override |
| public void onStart() { |
| Slog.e(TAG, "Starting PinnerService"); |
| |
| mBinderService = new BinderService(); |
| publishBinderService("pinner", mBinderService); |
| |
| // Files to pin come from the overlay and can be specified per-device config |
| // Continue trying to pin remaining files even if there is a failure |
| String[] filesToPin = mContext.getResources().getStringArray(com.android.internal.R.array.config_defaultPinnerServiceFiles); |
| for (int i = 0; i < filesToPin.length; i++){ |
| boolean success = pinFile(filesToPin[i], 0, 0); |
| if (success == true) { |
| mPinnedFiles.add(filesToPin[i]); |
| Slog.i(TAG, "Pinned file = " + filesToPin[i]); |
| } else { |
| Slog.e(TAG, "Failed to pin file = " + filesToPin[i]); |
| } |
| } |
| } |
| |
| // mlock length bytes of fileToPin in memory, starting at offset |
| // length == 0 means pin from offset to end of file |
| private boolean pinFile(String fileToPin, long offset, long length) { |
| FileDescriptor fd = new FileDescriptor(); |
| try { |
| fd = Os.open(fileToPin, OsConstants.O_RDONLY | OsConstants.O_CLOEXEC | OsConstants.O_NOFOLLOW, OsConstants.O_RDONLY); |
| |
| StructStat sb = Os.fstat(fd); |
| |
| if (offset + length > sb.st_size) { |
| Os.close(fd); |
| return false; |
| } |
| |
| if (length == 0) { |
| length = sb.st_size - offset; |
| } |
| |
| long address = Os.mmap(0, length, OsConstants.PROT_READ, OsConstants.MAP_PRIVATE, fd, offset); |
| Os.close(fd); |
| |
| Os.mlock(address, length); |
| |
| return true; |
| } catch (ErrnoException e) { |
| Slog.e(TAG, "Failed to pin file " + fileToPin + " with error " + e.getMessage()); |
| if(fd.valid()) { |
| try { Os.close(fd); } |
| catch (ErrnoException eClose) {Slog.e(TAG, "Failed to close fd, error = " + eClose.getMessage());} |
| } |
| return false; |
| } |
| } |
| |
| |
| private final class BinderService extends Binder { |
| @Override |
| protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| mContext.enforceCallingOrSelfPermission(android.Manifest.permission.DUMP, TAG); |
| pw.println("Pinned Files:"); |
| for (int i = 0; i < mPinnedFiles.size(); i++) { |
| pw.println(mPinnedFiles.get(i)); |
| } |
| } |
| } |
| } |