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227 lines
8.3 KiB
227 lines
8.3 KiB
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_NDEBUG 0
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#define LOG_TAG "AActivityManager"
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#include <utils/Log.h>
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#include <android/activity_manager.h>
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#include <binder/ActivityManager.h>
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namespace android {
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namespace activitymanager {
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// Global instance of ActivityManager, service is obtained only on first use.
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static ActivityManager gAm;
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// String tag used with ActivityManager.
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static const String16& getTag() {
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static String16 tag("libandroid");
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return tag;
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}
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struct UidObserver : public BnUidObserver, public virtual IBinder::DeathRecipient {
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explicit UidObserver(const AActivityManager_onUidImportance& cb,
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int32_t cutpoint, void* cookie)
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: mCallback(cb), mImportanceCutpoint(cutpoint), mCookie(cookie), mRegistered(false) {}
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bool registerSelf();
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void unregisterSelf();
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// IUidObserver
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void onUidGone(uid_t uid, bool disabled) override;
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void onUidActive(uid_t uid) override;
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void onUidIdle(uid_t uid, bool disabled) override;
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void onUidStateChanged(uid_t uid, int32_t procState, int64_t procStateSeq,
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int32_t capability) override;
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// IBinder::DeathRecipient implementation
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void binderDied(const wp<IBinder>& who) override;
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static int32_t procStateToImportance(int32_t procState);
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static int32_t importanceToProcState(int32_t importance);
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AActivityManager_onUidImportance mCallback;
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int32_t mImportanceCutpoint;
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void* mCookie;
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std::mutex mRegisteredLock;
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bool mRegistered GUARDED_BY(mRegisteredLock);
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};
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//static
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int32_t UidObserver::procStateToImportance(int32_t procState) {
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// TODO: remove this after adding Importance to onUidStateChanged callback.
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if (procState == ActivityManager::PROCESS_STATE_NONEXISTENT) {
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return AACTIVITYMANAGER_IMPORTANCE_GONE;
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} else if (procState >= ActivityManager::PROCESS_STATE_HOME) {
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return AACTIVITYMANAGER_IMPORTANCE_CACHED;
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} else if (procState == ActivityManager::PROCESS_STATE_HEAVY_WEIGHT) {
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return AACTIVITYMANAGER_IMPORTANCE_CANT_SAVE_STATE;
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} else if (procState >= ActivityManager::PROCESS_STATE_TOP_SLEEPING) {
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return AACTIVITYMANAGER_IMPORTANCE_TOP_SLEEPING;
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} else if (procState >= ActivityManager::PROCESS_STATE_SERVICE) {
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return AACTIVITYMANAGER_IMPORTANCE_SERVICE;
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} else if (procState >= ActivityManager::PROCESS_STATE_TRANSIENT_BACKGROUND) {
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return AACTIVITYMANAGER_IMPORTANCE_PERCEPTIBLE;
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} else if (procState >= ActivityManager::PROCESS_STATE_IMPORTANT_FOREGROUND) {
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return AACTIVITYMANAGER_IMPORTANCE_VISIBLE;
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} else if (procState >= ActivityManager::PROCESS_STATE_FOREGROUND_SERVICE) {
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return AACTIVITYMANAGER_IMPORTANCE_FOREGROUND_SERVICE;
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} else {
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return AACTIVITYMANAGER_IMPORTANCE_FOREGROUND;
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}
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}
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//static
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int32_t UidObserver::importanceToProcState(int32_t importance) {
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// TODO: remove this after adding Importance to onUidStateChanged callback.
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if (importance == AACTIVITYMANAGER_IMPORTANCE_GONE) {
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return ActivityManager::PROCESS_STATE_NONEXISTENT;
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} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_CACHED) {
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return ActivityManager::PROCESS_STATE_HOME;
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} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_CANT_SAVE_STATE) {
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return ActivityManager::PROCESS_STATE_HEAVY_WEIGHT;
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} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_TOP_SLEEPING) {
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return ActivityManager::PROCESS_STATE_TOP_SLEEPING;
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} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_SERVICE) {
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return ActivityManager::PROCESS_STATE_SERVICE;
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} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_PERCEPTIBLE) {
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return ActivityManager::PROCESS_STATE_TRANSIENT_BACKGROUND;
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} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_VISIBLE) {
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return ActivityManager::PROCESS_STATE_IMPORTANT_FOREGROUND;
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} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_FOREGROUND_SERVICE) {
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return ActivityManager::PROCESS_STATE_FOREGROUND_SERVICE;
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} else {
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return ActivityManager::PROCESS_STATE_TOP;
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}
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}
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void UidObserver::onUidGone(uid_t uid, bool disabled __unused) {
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std::scoped_lock lock{mRegisteredLock};
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if (mRegistered && mCallback) {
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mCallback(uid, AACTIVITYMANAGER_IMPORTANCE_GONE, mCookie);
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}
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}
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void UidObserver::onUidActive(uid_t uid __unused) {}
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void UidObserver::onUidIdle(uid_t uid __unused, bool disabled __unused) {}
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void UidObserver::onUidStateChanged(uid_t uid, int32_t procState,
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int64_t procStateSeq __unused,
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int32_t capability __unused) {
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std::scoped_lock lock{mRegisteredLock};
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if (mRegistered && mCallback) {
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mCallback(uid, procStateToImportance(procState), mCookie);
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}
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}
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void UidObserver::binderDied(const wp<IBinder>& /*who*/) {
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// ActivityManager is dead, try to re-register.
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{
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std::scoped_lock lock{mRegisteredLock};
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// If client already unregistered, don't try to re-register.
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if (!mRegistered) {
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return;
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}
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// Clear mRegistered to re-register.
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mRegistered = false;
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}
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registerSelf();
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}
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bool UidObserver::registerSelf() {
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std::scoped_lock lock{mRegisteredLock};
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if (mRegistered) {
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return true;
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}
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status_t res = gAm.linkToDeath(this);
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if (res != OK) {
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ALOGE("UidObserver: Failed to linkToDeath with ActivityManager (err %d)", res);
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return false;
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}
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// TODO: it seems only way to get all changes is to set cutoff to PROCESS_STATE_UNKNOWN.
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// But there is no equivalent of PROCESS_STATE_UNKNOWN in the UidImportance.
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// If mImportanceCutpoint is < 0, use PROCESS_STATE_UNKNOWN instead.
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res = gAm.registerUidObserver(
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this,
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ActivityManager::UID_OBSERVER_GONE | ActivityManager::UID_OBSERVER_PROCSTATE,
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(mImportanceCutpoint < 0) ? ActivityManager::PROCESS_STATE_UNKNOWN
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: importanceToProcState(mImportanceCutpoint),
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getTag());
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if (res != OK) {
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ALOGE("UidObserver: Failed to register with ActivityManager (err %d)", res);
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gAm.unlinkToDeath(this);
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return false;
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}
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mRegistered = true;
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ALOGV("UidObserver: Registered with ActivityManager");
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return true;
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}
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void UidObserver::unregisterSelf() {
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std::scoped_lock lock{mRegisteredLock};
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if (mRegistered) {
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gAm.unregisterUidObserver(this);
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gAm.unlinkToDeath(this);
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mRegistered = false;
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}
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ALOGV("UidObserver: Unregistered with ActivityManager");
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}
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} // activitymanager
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} // android
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using namespace android;
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using namespace activitymanager;
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struct AActivityManager_UidImportanceListener : public UidObserver {
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};
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AActivityManager_UidImportanceListener* AActivityManager_addUidImportanceListener(
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AActivityManager_onUidImportance onUidImportance, int32_t importanceCutpoint, void* cookie) {
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sp<UidObserver> observer(new UidObserver(onUidImportance, importanceCutpoint, cookie));
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if (observer == nullptr || !observer->registerSelf()) {
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return nullptr;
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}
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observer->incStrong((void *)AActivityManager_addUidImportanceListener);
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return static_cast<AActivityManager_UidImportanceListener*>(observer.get());
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}
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void AActivityManager_removeUidImportanceListener(
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AActivityManager_UidImportanceListener* listener) {
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if (listener != nullptr) {
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UidObserver* observer = static_cast<UidObserver*>(listener);
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observer->unregisterSelf();
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observer->decStrong((void *)AActivityManager_addUidImportanceListener);
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}
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}
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bool AActivityManager_isUidActive(uid_t uid) {
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return gAm.isUidActive(uid, getTag());
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}
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int32_t AActivityManager_getUidImportance(uid_t uid) {
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return UidObserver::procStateToImportance(gAm.getUidProcessState(uid, getTag()));
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}
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