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 void onUidProcAdjChanged(uid_t uid, int32_t adj) override;
49
50 // IBinder::DeathRecipient implementation
51 void binderDied(const wp<IBinder>& who) override;
52
53 static int32_t procStateToImportance(int32_t procState);
54 static int32_t importanceToProcState(int32_t importance);
55
56 AActivityManager_onUidImportance mCallback;
57 int32_t mImportanceCutpoint;
58 void* mCookie;
59 std::mutex mRegisteredLock;
60 bool mRegistered GUARDED_BY(mRegisteredLock);
61 };
62
63 //static
procStateToImportance(int32_t procState)64 int32_t UidObserver::procStateToImportance(int32_t procState) {
65 // TODO: remove this after adding Importance to onUidStateChanged callback.
66 if (procState == ActivityManager::PROCESS_STATE_NONEXISTENT) {
67 return AACTIVITYMANAGER_IMPORTANCE_GONE;
68 } else if (procState >= ActivityManager::PROCESS_STATE_HOME) {
69 return AACTIVITYMANAGER_IMPORTANCE_CACHED;
70 } else if (procState == ActivityManager::PROCESS_STATE_HEAVY_WEIGHT) {
71 return AACTIVITYMANAGER_IMPORTANCE_CANT_SAVE_STATE;
72 } else if (procState >= ActivityManager::PROCESS_STATE_TOP_SLEEPING) {
73 return AACTIVITYMANAGER_IMPORTANCE_TOP_SLEEPING;
74 } else if (procState >= ActivityManager::PROCESS_STATE_SERVICE) {
75 return AACTIVITYMANAGER_IMPORTANCE_SERVICE;
76 } else if (procState >= ActivityManager::PROCESS_STATE_TRANSIENT_BACKGROUND) {
77 return AACTIVITYMANAGER_IMPORTANCE_PERCEPTIBLE;
78 } else if (procState >= ActivityManager::PROCESS_STATE_IMPORTANT_FOREGROUND) {
79 return AACTIVITYMANAGER_IMPORTANCE_VISIBLE;
80 } else if (procState >= ActivityManager::PROCESS_STATE_FOREGROUND_SERVICE) {
81 return AACTIVITYMANAGER_IMPORTANCE_FOREGROUND_SERVICE;
82 } else {
83 return AACTIVITYMANAGER_IMPORTANCE_FOREGROUND;
84 }
85 }
86
87 //static
importanceToProcState(int32_t importance)88 int32_t UidObserver::importanceToProcState(int32_t importance) {
89 // TODO: remove this after adding Importance to onUidStateChanged callback.
90 if (importance == AACTIVITYMANAGER_IMPORTANCE_GONE) {
91 return ActivityManager::PROCESS_STATE_NONEXISTENT;
92 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_CACHED) {
93 return ActivityManager::PROCESS_STATE_HOME;
94 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_CANT_SAVE_STATE) {
95 return ActivityManager::PROCESS_STATE_HEAVY_WEIGHT;
96 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_TOP_SLEEPING) {
97 return ActivityManager::PROCESS_STATE_TOP_SLEEPING;
98 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_SERVICE) {
99 return ActivityManager::PROCESS_STATE_SERVICE;
100 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_PERCEPTIBLE) {
101 return ActivityManager::PROCESS_STATE_TRANSIENT_BACKGROUND;
102 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_VISIBLE) {
103 return ActivityManager::PROCESS_STATE_IMPORTANT_FOREGROUND;
104 } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_FOREGROUND_SERVICE) {
105 return ActivityManager::PROCESS_STATE_FOREGROUND_SERVICE;
106 } else {
107 return ActivityManager::PROCESS_STATE_TOP;
108 }
109 }
110
111
onUidGone(uid_t uid,bool disabled __unused)112 void UidObserver::onUidGone(uid_t uid, bool disabled __unused) {
113 std::scoped_lock lock{mRegisteredLock};
114
115 if (mRegistered && mCallback) {
116 mCallback(uid, AACTIVITYMANAGER_IMPORTANCE_GONE, mCookie);
117 }
118 }
119
onUidActive(uid_t uid __unused)120 void UidObserver::onUidActive(uid_t uid __unused) {}
121
onUidIdle(uid_t uid __unused,bool disabled __unused)122 void UidObserver::onUidIdle(uid_t uid __unused, bool disabled __unused) {}
123
onUidProcAdjChanged(uid_t uid __unused,int32_t adj __unused)124 void UidObserver::onUidProcAdjChanged(uid_t uid __unused, int32_t adj __unused) {}
125
onUidStateChanged(uid_t uid,int32_t procState,int64_t procStateSeq __unused,int32_t capability __unused)126 void UidObserver::onUidStateChanged(uid_t uid, int32_t procState,
127 int64_t procStateSeq __unused,
128 int32_t capability __unused) {
129 std::scoped_lock lock{mRegisteredLock};
130
131 if (mRegistered && mCallback) {
132 mCallback(uid, procStateToImportance(procState), mCookie);
133 }
134 }
135
binderDied(const wp<IBinder> &)136 void UidObserver::binderDied(const wp<IBinder>& /*who*/) {
137 // ActivityManager is dead, try to re-register.
138 {
139 std::scoped_lock lock{mRegisteredLock};
140 // If client already unregistered, don't try to re-register.
141 if (!mRegistered) {
142 return;
143 }
144 // Clear mRegistered to re-register.
145 mRegistered = false;
146 }
147 registerSelf();
148 }
149
registerSelf()150 bool UidObserver::registerSelf() {
151 std::scoped_lock lock{mRegisteredLock};
152 if (mRegistered) {
153 return true;
154 }
155
156 status_t res = gAm.linkToDeath(this);
157 if (res != OK) {
158 ALOGE("UidObserver: Failed to linkToDeath with ActivityManager (err %d)", res);
159 return false;
160 }
161
162 // TODO: it seems only way to get all changes is to set cutoff to PROCESS_STATE_UNKNOWN.
163 // But there is no equivalent of PROCESS_STATE_UNKNOWN in the UidImportance.
164 // If mImportanceCutpoint is < 0, use PROCESS_STATE_UNKNOWN instead.
165 res = gAm.registerUidObserver(
166 this,
167 ActivityManager::UID_OBSERVER_GONE | ActivityManager::UID_OBSERVER_PROCSTATE,
168 (mImportanceCutpoint < 0) ? ActivityManager::PROCESS_STATE_UNKNOWN
169 : importanceToProcState(mImportanceCutpoint),
170 getTag());
171 if (res != OK) {
172 ALOGE("UidObserver: Failed to register with ActivityManager (err %d)", res);
173 gAm.unlinkToDeath(this);
174 return false;
175 }
176
177 mRegistered = true;
178 ALOGV("UidObserver: Registered with ActivityManager");
179 return true;
180 }
181
unregisterSelf()182 void UidObserver::unregisterSelf() {
183 std::scoped_lock lock{mRegisteredLock};
184
185 if (mRegistered) {
186 gAm.unregisterUidObserver(this);
187 gAm.unlinkToDeath(this);
188 mRegistered = false;
189 }
190
191 ALOGV("UidObserver: Unregistered with ActivityManager");
192 }
193
194 } // activitymanager
195 } // android
196
197 using namespace android;
198 using namespace activitymanager;
199
200 struct AActivityManager_UidImportanceListener : public UidObserver {
201 };
202
AActivityManager_addUidImportanceListener(AActivityManager_onUidImportance onUidImportance,int32_t importanceCutpoint,void * cookie)203 AActivityManager_UidImportanceListener* AActivityManager_addUidImportanceListener(
204 AActivityManager_onUidImportance onUidImportance, int32_t importanceCutpoint, void* cookie) {
205 sp<UidObserver> observer(new UidObserver(onUidImportance, importanceCutpoint, cookie));
206 if (observer == nullptr || !observer->registerSelf()) {
207 return nullptr;
208 }
209 observer->incStrong((void *)AActivityManager_addUidImportanceListener);
210 return static_cast<AActivityManager_UidImportanceListener*>(observer.get());
211 }
212
AActivityManager_removeUidImportanceListener(AActivityManager_UidImportanceListener * listener)213 void AActivityManager_removeUidImportanceListener(
214 AActivityManager_UidImportanceListener* listener) {
215 if (listener != nullptr) {
216 UidObserver* observer = static_cast<UidObserver*>(listener);
217 observer->unregisterSelf();
218 observer->decStrong((void *)AActivityManager_addUidImportanceListener);
219 }
220 }
221
AActivityManager_isUidActive(uid_t uid)222 bool AActivityManager_isUidActive(uid_t uid) {
223 return gAm.isUidActive(uid, getTag());
224 }
225
AActivityManager_getUidImportance(uid_t uid)226 int32_t AActivityManager_getUidImportance(uid_t uid) {
227 return UidObserver::procStateToImportance(gAm.getUidProcessState(uid, getTag()));
228 }
229
230