1 /*
2 * Copyright (C) 2020 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 #define LOG_NDEBUG 0
18 #define LOG_TAG "AActivityManager"
19 #include <utils/Log.h>
20
21 #include <android/activity_manager.h>
22 #include <binder/ActivityManager.h>
23
24 namespace android {
25 namespace activitymanager {
26
27 // Global instance of ActivityManager, service is obtained only on first use.
28 static ActivityManager gAm;
29 // String tag used with ActivityManager.
getTag()30 static const String16& getTag() {
31 static String16 tag("libandroid");
32 return tag;
33 }
34
35 struct UidObserver : public BnUidObserver, public virtual IBinder::DeathRecipient {
UidObserverandroid::activitymanager::UidObserver36 explicit UidObserver(const AActivityManager_onUidImportance& cb,
37 int32_t cutpoint, void* cookie)
38 : mCallback(cb), mImportanceCutpoint(cutpoint), mCookie(cookie), mRegistered(false) {}
39 bool registerSelf();
40 void unregisterSelf();
41
42 // IUidObserver
43 void onUidGone(uid_t uid, bool disabled) override;
44 void onUidActive(uid_t uid) override;
45 void onUidIdle(uid_t uid, bool disabled) override;
46 void onUidStateChanged(uid_t uid, int32_t procState, int64_t procStateSeq,
47 int32_t capability) override;
48
49 // IBinder::DeathRecipient implementation
50 void binderDied(const wp<IBinder>& who) override;
51
52 static int32_t procStateToImportance(int32_t procState);
53 static int32_t importanceToProcState(int32_t importance);
54
55 AActivityManager_onUidImportance mCallback;
56 int32_t mImportanceCutpoint;
57 void* mCookie;
58 std::mutex mRegisteredLock;
59 bool mRegistered GUARDED_BY(mRegisteredLock);
60 };
61
62 //static
procStateToImportance(int32_t procState)63 int32_t UidObserver::procStateToImportance(int32_t procState) {
64 // TODO: remove this after adding Importance to onUidStateChanged callback.
65 if (procState == ActivityManager::PROCESS_STATE_NONEXISTENT) {
66 return AACTIVITYMANAGER_IMPORTANCE_GONE;
67 } else if (procState >= ActivityManager::PROCESS_STATE_HOME) {
68 return AACTIVITYMANAGER_IMPORTANCE_CACHED;
69 } else if (procState == ActivityManager::PROCESS_STATE_HEAVY_WEIGHT) {
70 return AACTIVITYMANAGER_IMPORTANCE_CANT_SAVE_STATE;
71 } else if (procState >= ActivityManager::PROCESS_STATE_TOP_SLEEPING) {
72 return AACTIVITYMANAGER_IMPORTANCE_TOP_SLEEPING;
73 } else if (procState >= ActivityManager::PROCESS_STATE_SERVICE) {
74 return AACTIVITYMANAGER_IMPORTANCE_SERVICE;
75 } else if (procState >= ActivityManager::PROCESS_STATE_TRANSIENT_BACKGROUND) {
76 return AACTIVITYMANAGER_IMPORTANCE_PERCEPTIBLE;
77 } else if (procState >= ActivityManager::PROCESS_STATE_IMPORTANT_FOREGROUND) {
78 return AACTIVITYMANAGER_IMPORTANCE_VISIBLE;
79 } else if (procState >= ActivityManager::PROCESS_STATE_FOREGROUND_SERVICE) {
80 return AACTIVITYMANAGER_IMPORTANCE_FOREGROUND_SERVICE;
81 } else {
82 return AACTIVITYMANAGER_IMPORTANCE_FOREGROUND;
83 }
84 }
85
86 //static
importanceToProcState(int32_t importance)87 int32_t UidObserver::importanceToProcState(int32_t importance) {
88 // TODO: remove this after adding Importance to onUidStateChanged callback.
89 if (importance == AACTIVITYMANAGER_IMPORTANCE_GONE) {
90 return ActivityManager::PROCESS_STATE_NONEXISTENT;
91 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_CACHED) {
92 return ActivityManager::PROCESS_STATE_HOME;
93 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_CANT_SAVE_STATE) {
94 return ActivityManager::PROCESS_STATE_HEAVY_WEIGHT;
95 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_TOP_SLEEPING) {
96 return ActivityManager::PROCESS_STATE_TOP_SLEEPING;
97 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_SERVICE) {
98 return ActivityManager::PROCESS_STATE_SERVICE;
99 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_PERCEPTIBLE) {
100 return ActivityManager::PROCESS_STATE_TRANSIENT_BACKGROUND;
101 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_VISIBLE) {
102 return ActivityManager::PROCESS_STATE_IMPORTANT_FOREGROUND;
103 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_FOREGROUND_SERVICE) {
104 return ActivityManager::PROCESS_STATE_FOREGROUND_SERVICE;
105 } else {
106 return ActivityManager::PROCESS_STATE_TOP;
107 }
108 }
109
110
onUidGone(uid_t uid,bool disabled __unused)111 void UidObserver::onUidGone(uid_t uid, bool disabled __unused) {
112 std::scoped_lock lock{mRegisteredLock};
113
114 if (mRegistered && mCallback) {
115 mCallback(uid, AACTIVITYMANAGER_IMPORTANCE_GONE, mCookie);
116 }
117 }
118
onUidActive(uid_t uid __unused)119 void UidObserver::onUidActive(uid_t uid __unused) {}
120
onUidIdle(uid_t uid __unused,bool disabled __unused)121 void UidObserver::onUidIdle(uid_t uid __unused, bool disabled __unused) {}
122
onUidStateChanged(uid_t uid,int32_t procState,int64_t procStateSeq __unused,int32_t capability __unused)123 void UidObserver::onUidStateChanged(uid_t uid, int32_t procState,
124 int64_t procStateSeq __unused,
125 int32_t capability __unused) {
126 std::scoped_lock lock{mRegisteredLock};
127
128 if (mRegistered && mCallback) {
129 mCallback(uid, procStateToImportance(procState), mCookie);
130 }
131 }
132
binderDied(const wp<IBinder> &)133 void UidObserver::binderDied(const wp<IBinder>& /*who*/) {
134 // ActivityManager is dead, try to re-register.
135 {
136 std::scoped_lock lock{mRegisteredLock};
137 // If client already unregistered, don't try to re-register.
138 if (!mRegistered) {
139 return;
140 }
141 // Clear mRegistered to re-register.
142 mRegistered = false;
143 }
144 registerSelf();
145 }
146
registerSelf()147 bool UidObserver::registerSelf() {
148 std::scoped_lock lock{mRegisteredLock};
149 if (mRegistered) {
150 return true;
151 }
152
153 status_t res = gAm.linkToDeath(this);
154 if (res != OK) {
155 ALOGE("UidObserver: Failed to linkToDeath with ActivityManager (err %d)", res);
156 return false;
157 }
158
159 // TODO: it seems only way to get all changes is to set cutoff to PROCESS_STATE_UNKNOWN.
160 // But there is no equivalent of PROCESS_STATE_UNKNOWN in the UidImportance.
161 // If mImportanceCutpoint is < 0, use PROCESS_STATE_UNKNOWN instead.
162 res = gAm.registerUidObserver(
163 this,
164 ActivityManager::UID_OBSERVER_GONE | ActivityManager::UID_OBSERVER_PROCSTATE,
165 (mImportanceCutpoint < 0) ? ActivityManager::PROCESS_STATE_UNKNOWN
166 : importanceToProcState(mImportanceCutpoint),
167 getTag());
168 if (res != OK) {
169 ALOGE("UidObserver: Failed to register with ActivityManager (err %d)", res);
170 gAm.unlinkToDeath(this);
171 return false;
172 }
173
174 mRegistered = true;
175 ALOGV("UidObserver: Registered with ActivityManager");
176 return true;
177 }
178
unregisterSelf()179 void UidObserver::unregisterSelf() {
180 std::scoped_lock lock{mRegisteredLock};
181
182 if (mRegistered) {
183 gAm.unregisterUidObserver(this);
184 gAm.unlinkToDeath(this);
185 mRegistered = false;
186 }
187
188 ALOGV("UidObserver: Unregistered with ActivityManager");
189 }
190
191 } // activitymanager
192 } // android
193
194 using namespace android;
195 using namespace activitymanager;
196
197 struct AActivityManager_UidImportanceListener : public UidObserver {
198 };
199
AActivityManager_addUidImportanceListener(AActivityManager_onUidImportance onUidImportance,int32_t importanceCutpoint,void * cookie)200 AActivityManager_UidImportanceListener* AActivityManager_addUidImportanceListener(
201 AActivityManager_onUidImportance onUidImportance, int32_t importanceCutpoint, void* cookie) {
202 sp<UidObserver> observer(new UidObserver(onUidImportance, importanceCutpoint, cookie));
203 if (observer == nullptr || !observer->registerSelf()) {
204 return nullptr;
205 }
206 observer->incStrong((void *)AActivityManager_addUidImportanceListener);
207 return static_cast<AActivityManager_UidImportanceListener*>(observer.get());
208 }
209
AActivityManager_removeUidImportanceListener(AActivityManager_UidImportanceListener * listener)210 void AActivityManager_removeUidImportanceListener(
211 AActivityManager_UidImportanceListener* listener) {
212 if (listener != nullptr) {
213 UidObserver* observer = static_cast<UidObserver*>(listener);
214 observer->unregisterSelf();
215 observer->decStrong((void *)AActivityManager_addUidImportanceListener);
216 }
217 }
218
AActivityManager_isUidActive(uid_t uid)219 bool AActivityManager_isUidActive(uid_t uid) {
220 return gAm.isUidActive(uid, getTag());
221 }
222
AActivityManager_getUidImportance(uid_t uid)223 int32_t AActivityManager_getUidImportance(uid_t uid) {
224 return UidObserver::procStateToImportance(gAm.getUidProcessState(uid, getTag()));
225 }
226
227