/services/java/com/android/server/UpdateLockService.java
https://github.com/aizuzi/platform_frameworks_base · Java · 126 lines · 89 code · 18 blank · 19 comment · 6 complexity · a15a802ad1523caff5a589a99aa6021e MD5 · raw file
- /*
- * Copyright (C) 2012 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.Intent;
- import android.content.pm.PackageManager;
- import android.os.Binder;
- import android.os.Handler;
- import android.os.IBinder;
- import android.os.IUpdateLock;
- import android.os.RemoteException;
- import android.os.SystemClock;
- import android.os.TokenWatcher;
- import android.os.UpdateLock;
- import android.os.UserHandle;
- import android.util.Slog;
- import java.io.FileDescriptor;
- import java.io.PrintWriter;
- public class UpdateLockService extends IUpdateLock.Stub {
- static final boolean DEBUG = false;
- static final String TAG = "UpdateLockService";
- // signatureOrSystem required to use update locks
- static final String PERMISSION = "android.permission.UPDATE_LOCK";
- Context mContext;
- LockWatcher mLocks;
- class LockWatcher extends TokenWatcher {
- LockWatcher(Handler h, String tag) {
- super(h, tag);
- }
- public void acquired() {
- if (DEBUG) {
- Slog.d(TAG, "first acquire; broadcasting convenient=false");
- }
- sendLockChangedBroadcast(false);
- }
- public void released() {
- if (DEBUG) {
- Slog.d(TAG, "last release; broadcasting convenient=true");
- }
- sendLockChangedBroadcast(true);
- }
- }
- UpdateLockService(Context context) {
- mContext = context;
- mLocks = new LockWatcher(new Handler(), "UpdateLocks");
- // Consider just-booting to be a reasonable time to allow
- // interruptions for update installation etc.
- sendLockChangedBroadcast(true);
- }
- void sendLockChangedBroadcast(boolean state) {
- // Safe early during boot because this broadcast only goes to registered receivers.
- long oldIdent = Binder.clearCallingIdentity();
- try {
- Intent intent = new Intent(UpdateLock.UPDATE_LOCK_CHANGED)
- .putExtra(UpdateLock.NOW_IS_CONVENIENT, state)
- .putExtra(UpdateLock.TIMESTAMP, System.currentTimeMillis())
- .addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
- mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
- } finally {
- Binder.restoreCallingIdentity(oldIdent);
- }
- }
- @Override
- public void acquireUpdateLock(IBinder token, String tag) throws RemoteException {
- if (DEBUG) {
- Slog.d(TAG, "acquire(" + token + ") by " + makeTag(tag));
- }
- mContext.enforceCallingOrSelfPermission(PERMISSION, "acquireUpdateLock");
- mLocks.acquire(token, makeTag(tag));
- }
- @Override
- public void releaseUpdateLock(IBinder token) throws RemoteException {
- if (DEBUG) {
- Slog.d(TAG, "release(" + token + ')');
- }
- mContext.enforceCallingOrSelfPermission(PERMISSION, "releaseUpdateLock");
- mLocks.release(token);
- };
- private String makeTag(String tag) {
- return "{tag=" + tag
- + " uid=" + Binder.getCallingUid()
- + " pid=" + Binder.getCallingPid() + '}';
- }
- @Override
- public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
- if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
- != PackageManager.PERMISSION_GRANTED) {
- pw.println("Permission Denial: can't dump update lock service from from pid="
- + Binder.getCallingPid()
- + ", uid=" + Binder.getCallingUid());
- return;
- }
- mLocks.dump(pw);
- }
- }