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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <mutex>
     18 #include <unistd.h>
     19 
     20 #include <binder/ActivityManager.h>
     21 #include <binder/Binder.h>
     22 #include <binder/IServiceManager.h>
     23 
     24 #include <utils/SystemClock.h>
     25 
     26 namespace android {
     27 
     28 ActivityManager::ActivityManager()
     29 {
     30 }
     31 
     32 sp<IActivityManager> ActivityManager::getService()
     33 {
     34     std::lock_guard<Mutex> scoped_lock(mLock);
     35     int64_t startTime = 0;
     36     sp<IActivityManager> service = mService;
     37     while (service == NULL || !IInterface::asBinder(service)->isBinderAlive()) {
     38         sp<IBinder> binder = defaultServiceManager()->checkService(String16("activity"));
     39         if (binder == NULL) {
     40             // Wait for the activity service to come back...
     41             if (startTime == 0) {
     42                 startTime = uptimeMillis();
     43                 ALOGI("Waiting for activity service");
     44             } else if ((uptimeMillis() - startTime) > 1000000) {
     45                 ALOGW("Waiting too long for activity service, giving up");
     46                 service = NULL;
     47                 break;
     48             }
     49             usleep(25000);
     50         } else {
     51             service = interface_cast<IActivityManager>(binder);
     52             mService = service;
     53         }
     54     }
     55     return service;
     56 }
     57 
     58 int ActivityManager::openContentUri(const String16& stringUri)
     59 {
     60     sp<IActivityManager> service = getService();
     61     return service != NULL ? service->openContentUri(stringUri) : -1;
     62 }
     63 
     64 void ActivityManager::registerUidObserver(const sp<IUidObserver>& observer,
     65                                           const int32_t event,
     66                                           const int32_t cutpoint,
     67                                           const String16& callingPackage)
     68 {
     69     sp<IActivityManager> service = getService();
     70     if (service != NULL) {
     71         service->registerUidObserver(observer, event, cutpoint, callingPackage);
     72     }
     73 }
     74 
     75 void ActivityManager::unregisterUidObserver(const sp<IUidObserver>& observer)
     76 {
     77     sp<IActivityManager> service = getService();
     78     if (service != NULL) {
     79         service->unregisterUidObserver(observer);
     80     }
     81 }
     82 
     83 bool ActivityManager::isUidActive(const uid_t uid, const String16& callingPackage)
     84 {
     85     sp<IActivityManager> service = getService();
     86     if (service != NULL) {
     87         return service->isUidActive(uid, callingPackage);
     88     }
     89     return false;
     90 }
     91 
     92 status_t ActivityManager::linkToDeath(const sp<IBinder::DeathRecipient>& recipient) {
     93     sp<IActivityManager> service = getService();
     94     if (service != NULL) {
     95         return IInterface::asBinder(service)->linkToDeath(recipient);
     96     }
     97     return INVALID_OPERATION;
     98 }
     99 
    100 status_t ActivityManager::unlinkToDeath(const sp<IBinder::DeathRecipient>& recipient) {
    101     sp<IActivityManager> service = getService();
    102     if (service != NULL) {
    103         return IInterface::asBinder(service)->unlinkToDeath(recipient);
    104     }
    105     return INVALID_OPERATION;
    106 }
    107 
    108 }; // namespace android
    109