/*
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* Copyright (C) 2010 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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#ifndef ANDROID_SENSOR_SERVICE_H
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#define ANDROID_SENSOR_SERVICE_H
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#include "SensorList.h"
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#include "RecentEventLogger.h"
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#include <binder/AppOpsManager.h>
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#include <binder/BinderService.h>
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#include <binder/IUidObserver.h>
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#include <cutils/compiler.h>
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#include <cutils/multiuser.h>
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#include <sensor/ISensorServer.h>
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#include <sensor/ISensorEventConnection.h>
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#include <sensor/Sensor.h>
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#include "android/hardware/BnSensorPrivacyListener.h"
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#include <utils/AndroidThreads.h>
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#include <utils/KeyedVector.h>
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#include <utils/Looper.h>
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#include <utils/SortedVector.h>
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#include <utils/String8.h>
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#include <utils/Vector.h>
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#include <utils/threads.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <unordered_map>
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#include <unordered_set>
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#if __clang__
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// Clang warns about SensorEventConnection::dump hiding BBinder::dump. The cause isn't fixable
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// without changing the API, so let's tell clang this is indeed intentional.
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#pragma clang diagnostic ignored "-Woverloaded-virtual"
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#endif
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// ---------------------------------------------------------------------------
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#define IGNORE_HARDWARE_FUSION false
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#define DEBUG_CONNECTIONS false
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// Max size is 100 KB which is enough to accept a batch of about 1000 events.
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#define MAX_SOCKET_BUFFER_SIZE_BATCHED (100 * 1024)
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// For older HALs which don't support batching, use a smaller socket buffer size.
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#define SOCKET_BUFFER_SIZE_NON_BATCHED (4 * 1024)
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#define SENSOR_REGISTRATIONS_BUF_SIZE 200
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namespace android {
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// ---------------------------------------------------------------------------
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class SensorInterface;
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class SensorService :
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public BinderService<SensorService>,
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public BnSensorServer,
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protected Thread
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{
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// nested class/struct for internal use
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class SensorEventConnection;
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class SensorDirectConnection;
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public:
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void cleanupConnection(SensorEventConnection* connection);
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void cleanupConnection(SensorDirectConnection* c);
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status_t enable(const sp<SensorEventConnection>& connection, int handle,
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nsecs_t samplingPeriodNs, nsecs_t maxBatchReportLatencyNs, int reservedFlags,
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const String16& opPackageName);
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status_t disable(const sp<SensorEventConnection>& connection, int handle);
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status_t setEventRate(const sp<SensorEventConnection>& connection, int handle, nsecs_t ns,
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const String16& opPackageName);
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status_t flushSensor(const sp<SensorEventConnection>& connection,
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const String16& opPackageName);
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virtual status_t shellCommand(int in, int out, int err, Vector<String16>& args);
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private:
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friend class BinderService<SensorService>;
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// nested class/struct for internal use
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class SensorRecord;
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class SensorEventAckReceiver;
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class SensorRegistrationInfo;
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// If accessing a sensor we need to make sure the UID has access to it. If
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// the app UID is idle then it cannot access sensors and gets no trigger
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// events, no on-change events, flush event behavior does not change, and
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// recurring events are the same as the first one delivered in idle state
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// emulating no sensor change. As soon as the app UID transitions to an
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// active state we will start reporting events as usual and vise versa. This
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// approach transparently handles observing sensors while the app UID transitions
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// between idle/active state avoiding to get stuck in a state receiving sensor
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// data while idle or not receiving sensor data while active.
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class UidPolicy : public BnUidObserver {
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public:
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explicit UidPolicy(wp<SensorService> service)
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: mService(service) {}
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void registerSelf();
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void unregisterSelf();
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bool isUidActive(uid_t uid);
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void onUidGone(uid_t uid, bool disabled);
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void onUidActive(uid_t uid);
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void onUidIdle(uid_t uid, bool disabled);
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void onUidStateChanged(uid_t uid __unused, int32_t procState __unused,
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int64_t procStateSeq __unused) {}
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void addOverrideUid(uid_t uid, bool active);
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void removeOverrideUid(uid_t uid);
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private:
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bool isUidActiveLocked(uid_t uid);
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void updateOverrideUid(uid_t uid, bool active, bool insert);
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Mutex mUidLock;
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wp<SensorService> mService;
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std::unordered_set<uid_t> mActiveUids;
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std::unordered_map<uid_t, bool> mOverrideUids;
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};
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// Sensor privacy allows a user to disable access to all sensors on the device. When
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// enabled sensor privacy will prevent all apps, including active apps, from accessing
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// sensors, they will not receive trigger nor on-change events, flush event behavior
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// does not change, and recurring events are the same as the first one delivered when
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// sensor privacy was enabled. All sensor direct connections will be stopped as well
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// and new direct connections will not be allowed while sensor privacy is enabled.
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// Once sensor privacy is disabled access to sensors will be restored for active
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// apps, previously stopped direct connections will be restarted, and new direct
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// connections will be allowed again.
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class SensorPrivacyPolicy : public hardware::BnSensorPrivacyListener {
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public:
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explicit SensorPrivacyPolicy(wp<SensorService> service) : mService(service) {}
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void registerSelf();
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void unregisterSelf();
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bool isSensorPrivacyEnabled();
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binder::Status onSensorPrivacyChanged(bool enabled);
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private:
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wp<SensorService> mService;
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std::atomic_bool mSensorPrivacyEnabled;
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};
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enum Mode {
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// The regular operating mode where any application can register/unregister/call flush on
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// sensors.
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NORMAL = 0,
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// This mode is only used for testing purposes. Not all HALs support this mode. In this mode,
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// the HAL ignores the sensor data provided by physical sensors and accepts the data that is
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// injected from the SensorService as if it were the real sensor data. This mode is primarily
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// used for testing various algorithms like vendor provided SensorFusion, Step Counter and
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// Step Detector etc. Typically in this mode, there will be a client (a
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// SensorEventConnection) which will be injecting sensor data into the HAL. Normal apps can
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// unregister and register for any sensor that supports injection. Registering to sensors
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// that do not support injection will give an error. TODO(aakella) : Allow exactly one
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// client to inject sensor data at a time.
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DATA_INJECTION = 1,
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// This mode is used only for testing sensors. Each sensor can be tested in isolation with
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// the required sampling_rate and maxReportLatency parameters without having to think about
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// the data rates requested by other applications. End user devices are always expected to be
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// in NORMAL mode. When this mode is first activated, all active sensors from all connections
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// are disabled. Calling flush() will return an error. In this mode, only the requests from
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// selected apps whose package names are whitelisted are allowed (typically CTS apps). Only
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// these apps can register/unregister/call flush() on sensors. If SensorService switches to
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// NORMAL mode again, all sensors that were previously registered to are activated with the
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// corresponding paramaters if the application hasn't unregistered for sensors in the mean
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// time. NOTE: Non whitelisted app whose sensors were previously deactivated may still
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// receive events if a whitelisted app requests data from the same sensor.
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RESTRICTED = 2
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// State Transitions supported.
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// RESTRICTED <--- NORMAL ---> DATA_INJECTION
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// ---> <---
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// Shell commands to switch modes in SensorService.
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// 1) Put SensorService in RESTRICTED mode with packageName .cts. If it is already in
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// restricted mode it is treated as a NO_OP (and packageName is NOT changed).
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//
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// $ adb shell dumpsys sensorservice restrict .cts.
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//
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// 2) Put SensorService in DATA_INJECTION mode with packageName .xts. If it is already in
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// data_injection mode it is treated as a NO_OP (and packageName is NOT changed).
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//
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// $ adb shell dumpsys sensorservice data_injection .xts.
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//
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// 3) Reset sensorservice back to NORMAL mode.
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// $ adb shell dumpsys sensorservice enable
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};
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static const char* WAKE_LOCK_NAME;
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static char const* getServiceName() ANDROID_API { return "sensorservice"; }
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SensorService() ANDROID_API;
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virtual ~SensorService();
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virtual void onFirstRef();
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// Thread interface
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virtual bool threadLoop();
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// ISensorServer interface
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virtual Vector<Sensor> getSensorList(const String16& opPackageName);
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virtual Vector<Sensor> getDynamicSensorList(const String16& opPackageName);
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virtual sp<ISensorEventConnection> createSensorEventConnection(
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const String8& packageName,
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int requestedMode, const String16& opPackageName);
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virtual int isDataInjectionEnabled();
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virtual sp<ISensorEventConnection> createSensorDirectConnection(const String16& opPackageName,
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uint32_t size, int32_t type, int32_t format, const native_handle *resource);
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virtual int setOperationParameter(
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int32_t handle, int32_t type, const Vector<float> &floats, const Vector<int32_t> &ints);
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virtual status_t dump(int fd, const Vector<String16>& args);
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String8 getSensorName(int handle) const;
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bool isVirtualSensor(int handle) const;
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sp<SensorInterface> getSensorInterfaceFromHandle(int handle) const;
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bool isWakeUpSensor(int type) const;
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void recordLastValueLocked(sensors_event_t const* buffer, size_t count);
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static void sortEventBuffer(sensors_event_t* buffer, size_t count);
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const Sensor& registerSensor(SensorInterface* sensor,
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bool isDebug = false, bool isVirtual = false);
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const Sensor& registerVirtualSensor(SensorInterface* sensor, bool isDebug = false);
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const Sensor& registerDynamicSensorLocked(SensorInterface* sensor, bool isDebug = false);
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bool unregisterDynamicSensorLocked(int handle);
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status_t cleanupWithoutDisable(const sp<SensorEventConnection>& connection, int handle);
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status_t cleanupWithoutDisableLocked(const sp<SensorEventConnection>& connection, int handle);
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void cleanupAutoDisabledSensorLocked(const sp<SensorEventConnection>& connection,
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sensors_event_t const* buffer, const int count);
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static bool canAccessSensor(const Sensor& sensor, const char* operation,
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const String16& opPackageName);
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static bool hasPermissionForSensor(const Sensor& sensor);
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static int getTargetSdkVersion(const String16& opPackageName);
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// SensorService acquires a partial wakelock for delivering events from wake up sensors. This
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// method checks whether all the events from these wake up sensors have been delivered to the
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// corresponding applications, if yes the wakelock is released.
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void checkWakeLockState();
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void checkWakeLockStateLocked();
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bool isWakeLockAcquired();
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bool isWakeUpSensorEvent(const sensors_event_t& event) const;
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sp<Looper> getLooper() const;
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// Reset mWakeLockRefCounts for all SensorEventConnections to zero. This may happen if
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// SensorService did not receive any acknowledgements from apps which have registered for
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// wake_up sensors.
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void resetAllWakeLockRefCounts();
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// Acquire or release wake_lock. If wake_lock is acquired, set the timeout in the looper to 5
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// seconds and wake the looper.
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void setWakeLockAcquiredLocked(bool acquire);
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// Send events from the event cache for this particular connection.
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void sendEventsFromCache(const sp<SensorEventConnection>& connection);
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// Promote all weak referecences in mActiveConnections vector to strong references and add them
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// to the output vector.
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void populateActiveConnections( SortedVector< sp<SensorEventConnection> >* activeConnections);
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// If SensorService is operating in RESTRICTED mode, only select whitelisted packages are
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// allowed to register for or call flush on sensors. Typically only cts test packages are
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// allowed.
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bool isWhiteListedPackage(const String8& packageName);
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bool isOperationPermitted(const String16& opPackageName);
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// Reset the state of SensorService to NORMAL mode.
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status_t resetToNormalMode();
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status_t resetToNormalModeLocked();
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// Transforms the UUIDs for all the sensors into proper IDs.
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void makeUuidsIntoIdsForSensorList(Vector<Sensor> &sensorList) const;
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// Gets the appropriate ID from the given UUID.
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int32_t getIdFromUuid(const Sensor::uuid_t &uuid) const;
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// Either read from storage or create a new one.
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static bool initializeHmacKey();
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// Enable SCHED_FIFO priority for thread
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void enableSchedFifoMode();
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// Sets whether the given UID can get sensor data
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void setSensorAccess(uid_t uid, bool hasAccess);
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// Overrides the UID state as if it is idle
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status_t handleSetUidState(Vector<String16>& args, int err);
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// Clears the override for the UID state
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status_t handleResetUidState(Vector<String16>& args, int err);
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// Gets the UID state
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status_t handleGetUidState(Vector<String16>& args, int out, int err);
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// Prints the shell command help
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status_t printHelp(int out);
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// temporarily stops all active direct connections and disables all sensors
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void disableAllSensors();
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void disableAllSensorsLocked();
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// restarts the previously stopped direct connections and enables all sensors
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void enableAllSensors();
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void enableAllSensorsLocked();
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static uint8_t sHmacGlobalKey[128];
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static bool sHmacGlobalKeyIsValid;
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SensorServiceUtil::SensorList mSensors;
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status_t mInitCheck;
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// Socket buffersize used to initialize BitTube. This size depends on whether batching is
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// supported or not.
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uint32_t mSocketBufferSize;
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sp<Looper> mLooper;
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sp<SensorEventAckReceiver> mAckReceiver;
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// protected by mLock
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mutable Mutex mLock;
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DefaultKeyedVector<int, SensorRecord*> mActiveSensors;
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std::unordered_set<int> mActiveVirtualSensors;
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SortedVector< wp<SensorEventConnection> > mActiveConnections;
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bool mWakeLockAcquired;
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sensors_event_t *mSensorEventBuffer, *mSensorEventScratch;
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wp<const SensorEventConnection> * mMapFlushEventsToConnections;
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std::unordered_map<int, SensorServiceUtil::RecentEventLogger*> mRecentEvent;
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SortedVector< wp<SensorDirectConnection> > mDirectConnections;
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Mode mCurrentOperatingMode;
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// This packagaName is set when SensorService is in RESTRICTED or DATA_INJECTION mode. Only
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// applications with this packageName are allowed to activate/deactivate or call flush on
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// sensors. To run CTS this is can be set to ".cts." and only CTS tests will get access to
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// sensors.
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String8 mWhiteListedPackage;
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int mNextSensorRegIndex;
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Vector<SensorRegistrationInfo> mLastNSensorRegistrations;
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sp<UidPolicy> mUidPolicy;
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sp<SensorPrivacyPolicy> mSensorPrivacyPolicy;
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static AppOpsManager sAppOpsManager;
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static std::map<String16, int> sPackageTargetVersion;
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static Mutex sPackageTargetVersionLock;
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};
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} // namespace android
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#endif // ANDROID_SENSOR_SERVICE_H
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