private static ApplicationInfo maybeAdjustApplicationInfo(ApplicationInfo info) {
    // If we're dealing with a multi-arch application that has both
    // 32 and 64 bit shared libraries, we might need to choose the secondary
    // depending on what the current runtime's instruction set is.
    if (info.primaryCpuAbi != null && info.secondaryCpuAbi != null) {
        final String runtimeIsa = VMRuntime.getRuntime().vmInstructionSet();

        // Get the instruction set that the libraries of secondary Abi is supported.
        // In presence of a native bridge this might be different than the one secondary Abi used.
        String secondaryIsa = VMRuntime.getInstructionSet(info.secondaryCpuAbi);
        final String secondaryDexCodeIsa = SystemProperties.get("ro.dalvik.vm.isa." + secondaryIsa);
        secondaryIsa = secondaryDexCodeIsa.isEmpty() ? secondaryIsa : secondaryDexCodeIsa;

        // If the runtimeIsa is the same as the primary isa, then we do nothing.
        // Everything will be set up correctly because info.nativeLibraryDir will
        // correspond to the right ISA.
        if (runtimeIsa.equals(secondaryIsa)) {
            ApplicationInfo modified = new ApplicationInfo(info);
            modified.nativeLibraryDir = info.secondaryNativeLibraryDir;
            return modified;
        }
    }
    return info;
}
 

/**
 * Reserve space for the native library to be loaded into.
 */
static void reserveAddressSpaceInZygote() {
    System.loadLibrary("webviewchromium_loader");
    long addressSpaceToReserve =
            SystemProperties.getLong(WebViewFactory.CHROMIUM_WEBVIEW_VMSIZE_SIZE_PROPERTY,
            CHROMIUM_WEBVIEW_DEFAULT_VMSIZE_BYTES);
    sAddressSpaceReserved = nativeReserveAddressSpace(addressSpaceToReserve);

    if (sAddressSpaceReserved) {
        if (DEBUG) {
            Log.v(LOGTAG, "address space reserved: " + addressSpaceToReserve + " bytes");
        }
    } else {
        Log.e(LOGTAG, "reserving " + addressSpaceToReserve + " bytes of address space failed");
    }
}
 

private static void maybeAdjustApplicationInfo(ApplicationInfo info) {
    // If we're dealing with a multi-arch application that has both
    // 32 and 64 bit shared libraries, we might need to choose the secondary
    // depending on what the current runtime's instruction set is.
    if (info.primaryCpuAbi != null && info.secondaryCpuAbi != null) {
        final String runtimeIsa = VMRuntime.getRuntime().vmInstructionSet();

        // Get the instruction set that the libraries of secondary Abi is supported.
        // In presence of a native bridge this might be different than the one secondary Abi used.
        String secondaryIsa = VMRuntime.getInstructionSet(info.secondaryCpuAbi);
        final String secondaryDexCodeIsa = SystemProperties.get("ro.dalvik.vm.isa." + secondaryIsa);
        secondaryIsa = secondaryDexCodeIsa.isEmpty() ? secondaryIsa : secondaryDexCodeIsa;

        // If the runtimeIsa is the same as the primary isa, then we do nothing.
        // Everything will be set up correctly because info.nativeLibraryDir will
        // correspond to the right ISA.
        if (runtimeIsa.equals(secondaryIsa)) {
            info.nativeLibraryDir = info.secondaryNativeLibraryDir;
        }
    }
}
 

private static ApplicationInfo maybeAdjustApplicationInfo(ApplicationInfo info) {
    // If we're dealing with a multi-arch application that has both
    // 32 and 64 bit shared libraries, we might need to choose the secondary
    // depending on what the current runtime's instruction set is.
    if (info.primaryCpuAbi != null && info.secondaryCpuAbi != null) {
        final String runtimeIsa = VMRuntime.getRuntime().vmInstructionSet();

        // Get the instruction set that the libraries of secondary Abi is supported.
        // In presence of a native bridge this might be different than the one secondary Abi used.
        String secondaryIsa = VMRuntime.getInstructionSet(info.secondaryCpuAbi);
        final String secondaryDexCodeIsa = SystemProperties.get("ro.dalvik.vm.isa." + secondaryIsa);
        secondaryIsa = secondaryDexCodeIsa.isEmpty() ? secondaryIsa : secondaryDexCodeIsa;

        // If the runtimeIsa is the same as the primary isa, then we do nothing.
        // Everything will be set up correctly because info.nativeLibraryDir will
        // correspond to the right ISA.
        if (runtimeIsa.equals(secondaryIsa)) {
            ApplicationInfo modified = new ApplicationInfo(info);
            modified.nativeLibraryDir = info.secondaryNativeLibraryDir;
            return modified;
        }
    }
    return info;
}
 

@Override
public void onBootPhase(int phase) {
    if (phase == SystemService.PHASE_THIRD_PARTY_APPS_CAN_START) {
        if (Build.IS_DEBUGGABLE) {
            SystemProperties.addChangeCallback(mSystemPropertiesChanged);
        }
        mContext.registerReceiver(new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                writePulseGestureEnabled();
                synchronized (mLock) {
                    stopDreamLocked(false /*immediate*/);
                }
            }
        }, new IntentFilter(Intent.ACTION_USER_SWITCHED), null, mHandler);
        mContext.getContentResolver().registerContentObserver(
                Settings.Secure.getUriFor(Settings.Secure.DOZE_PULSE_ON_DOUBLE_TAP), false,
                mDozeEnabledObserver, UserHandle.USER_ALL);
        writePulseGestureEnabled();
    }
}
 

private static ApplicationInfo maybeAdjustApplicationInfo(ApplicationInfo info) {
    // If we're dealing with a multi-arch application that has both
    // 32 and 64 bit shared libraries, we might need to choose the secondary
    // depending on what the current runtime's instruction set is.
    if (info.primaryCpuAbi != null && info.secondaryCpuAbi != null) {
        final String runtimeIsa = VMRuntime.getRuntime().vmInstructionSet();

        // Get the instruction set that the libraries of secondary Abi is supported.
        // In presence of a native bridge this might be different than the one secondary Abi used.
        String secondaryIsa = VMRuntime.getInstructionSet(info.secondaryCpuAbi);
        final String secondaryDexCodeIsa = SystemProperties.get("ro.dalvik.vm.isa." + secondaryIsa);
        secondaryIsa = secondaryDexCodeIsa.isEmpty() ? secondaryIsa : secondaryDexCodeIsa;

        // If the runtimeIsa is the same as the primary isa, then we do nothing.
        // Everything will be set up correctly because info.nativeLibraryDir will
        // correspond to the right ISA.
        if (runtimeIsa.equals(secondaryIsa)) {
            ApplicationInfo modified = new ApplicationInfo(info);
            modified.nativeLibraryDir = info.secondaryNativeLibraryDir;
            return modified;
        }
    }
    return info;
}
 

private static ApplicationInfo maybeAdjustApplicationInfo(ApplicationInfo info) {
    // If we're dealing with a multi-arch application that has both
    // 32 and 64 bit shared libraries, we might need to choose the secondary
    // depending on what the current runtime's instruction set is.
    if (info.primaryCpuAbi != null && info.secondaryCpuAbi != null) {
        final String runtimeIsa = VMRuntime.getRuntime().vmInstructionSet();

        // Get the instruction set that the libraries of secondary Abi is supported.
        // In presence of a native bridge this might be different than the one secondary Abi used.
        String secondaryIsa = VMRuntime.getInstructionSet(info.secondaryCpuAbi);
        final String secondaryDexCodeIsa = SystemProperties.get("ro.dalvik.vm.isa." + secondaryIsa);
        secondaryIsa = secondaryDexCodeIsa.isEmpty() ? secondaryIsa : secondaryDexCodeIsa;

        // If the runtimeIsa is the same as the primary isa, then we do nothing.
        // Everything will be set up correctly because info.nativeLibraryDir will
        // correspond to the right ISA.
        if (runtimeIsa.equals(secondaryIsa)) {
            ApplicationInfo modified = new ApplicationInfo(info);
            modified.nativeLibraryDir = info.secondaryNativeLibraryDir;
            return modified;
        }
    }
    return info;
}
 

/**
 * Propagates the provided saturation to the SurfaceFlinger.
 */
private void applySaturation(float saturation) {
    SystemProperties.set(PERSISTENT_PROPERTY_SATURATION, Float.toString(saturation));
    final IBinder flinger = ServiceManager.getService(SURFACE_FLINGER);
    if (flinger != null) {
        final Parcel data = Parcel.obtain();
        data.writeInterfaceToken("android.ui.ISurfaceComposer");
        data.writeFloat(saturation);
        try {
            flinger.transact(SURFACE_FLINGER_TRANSACTION_SATURATION, data, null, 0);
        } catch (RemoteException ex) {
            Log.e(TAG, "Failed to set saturation", ex);
        } finally {
            data.recycle();
        }
    }
}
 

@TargetApi(M)
@Override
public void safeMode() {
    preliminaryPreparation("safeMode");
    injectSystemThread(() -> {
        if (SDK_INT < N) {
            //ShutdownThread.java
            // Indicates whether we are rebooting into safe mode
            //public static final String REBOOT_SAFEMODE_PROPERTY = "persist.sys.safemode";
            SystemProperties.set("persist.sys.safemode", "1");
            mPowerManager.reboot(null);
            return;
        }
        invokeNoThrowAndReturn(rebootSafeMode, mPowerManager);
    });
}
 

public ProcessStatsService(ActivityManagerService am, File file) {
    mAm = am;
    mBaseDir = file;
    mBaseDir.mkdirs();
    mProcessStats = new ProcessStats(true);
    updateFile();
    SystemProperties.addChangeCallback(new Runnable() {
        @Override public void run() {
            synchronized (mAm) {
                if (mProcessStats.evaluateSystemProperties(false)) {
                    mProcessStats.mFlags |= ProcessStats.FLAG_SYSPROPS;
                    writeStateLocked(true, true);
                    mProcessStats.evaluateSystemProperties(true);
                }
            }
        }
    });
}
 

private void determineVerifiedBootState(View v) {
    try {
        String propSystemVerified = SystemProperties.get("partition.system.verified", "0");
        String propState = SystemProperties.get("ro.boot.verifiedbootstate", "");
        File fileDmVerityModule = new File("/sys/module/dm_verity");

        boolean verified = !propSystemVerified.equals("0");
        boolean detected = !propState.isEmpty() || fileDmVerityModule.exists();

        TextView tv = v.findViewById(R.id.dmverity);
        if (verified) {
            tv.setText(R.string.verified_boot_active);
            tv.setTextColor(getResources().getColor(R.color.warning, null));
        } else if (detected) {
            tv.setText(R.string.verified_boot_deactivated);
            v.findViewById(R.id.dmverity_explanation).setVisibility(View.GONE);
        } else {
            tv.setText(R.string.verified_boot_none);
            tv.setTextColor(getResources().getColor(R.color.warning, null));
            v.findViewById(R.id.dmverity_explanation).setVisibility(View.GONE);
        }
    } catch (Exception e) {
        Log.e(TAG, "Could not detect Verified Boot state", e);
    }
}
 

private Choreographer(Looper looper, int vsyncSource) {
    mLooper = looper;
    mHandler = new FrameHandler(looper);
    mDisplayEventReceiver = USE_VSYNC
            ? new FrameDisplayEventReceiver(looper, vsyncSource)
            : null;
    mLastFrameTimeNanos = Long.MIN_VALUE;

    mFrameIntervalNanos = (long)(1000000000 / getRefreshRate());

    mCallbackQueues = new CallbackQueue[CALLBACK_LAST + 1];
    for (int i = 0; i <= CALLBACK_LAST; i++) {
        mCallbackQueues[i] = new CallbackQueue();
    }
    // b/68769804: For low FPS experiments.
    setFPSDivisor(SystemProperties.getInt(ThreadedRenderer.DEBUG_FPS_DIVISOR, 1));
}
 

/**
 * Indicates whether threaded rendering is available under any form for
 * the view hierarchy.
 *
 * @return True if the view hierarchy can potentially be defer rendered,
 *         false otherwise
 */
public static boolean isAvailable() {
    if (sSupportsOpenGL != null) {
        return sSupportsOpenGL.booleanValue();
    }
    if (SystemProperties.getInt("ro.kernel.qemu", 0) == 0) {
        // Device is not an emulator.
        sSupportsOpenGL = true;
        return true;
    }
    int qemu_gles = SystemProperties.getInt("qemu.gles", -1);
    if (qemu_gles == -1) {
        // In this case, the value of the qemu.gles property is not ready
        // because the SurfaceFlinger service may not start at this point.
        return false;
    }
    // In the emulator this property will be set > 0 when OpenGL ES 2.0 is
    // enabled, 0 otherwise. On old emulator versions it will be undefined.
    sSupportsOpenGL = qemu_gles > 0;
    return sSupportsOpenGL.booleanValue();
}
 

private boolean isBuggy() {
    // STOPSHIP: fix buggy apps
    if (SystemProperties.getBoolean("fw.ignore_buggy", false)) return false;
    if ("com.google.android.tts".equals(getApplicationInfo().packageName)) return true;
    if ("com.breel.geswallpapers".equals(getApplicationInfo().packageName)) return true;
    return false;
}
 

private SyncManager getSyncManager() {
    if (SystemProperties.getBoolean("config.disable_network", false)) {
        return null;
    }

    synchronized(mSyncManagerLock) {
        try {
            // Try to create the SyncManager, return null if it fails (e.g. the disk is full).
            if (mSyncManager == null) mSyncManager = new SyncManager(mContext, mFactoryTest);
        } catch (SQLiteException e) {
            Log.e(TAG, "Can't create SyncManager", e);
        }
        return mSyncManager;
    }
}
 

public static String getProductVariant() {
    String result = "";
    try {
        result = SystemProperties.get(PROPERTY_PRODUCT_VARIANT, null).toUpperCase();
    } catch (Exception e) {
    } catch (Error e2) {
    }
    return result;
}
 

private void setupJitProfileSupport() {
    if (!SystemProperties.getBoolean("dalvik.vm.usejitprofiles", false)) {
        return;
    }
    // Only set up profile support if the loaded apk has the same uid as the
    // current process.
    // Currently, we do not support profiling across different apps.
    // (e.g. application's uid might be different when the code is
    // loaded by another app via createApplicationContext)
    if (mApplicationInfo.uid != Process.myUid()) {
        return;
    }

    final List<String> codePaths = new ArrayList<>();
    if ((mApplicationInfo.flags & ApplicationInfo.FLAG_HAS_CODE) != 0) {
        codePaths.add(mApplicationInfo.sourceDir);
    }
    if (mApplicationInfo.splitSourceDirs != null) {
        Collections.addAll(codePaths, mApplicationInfo.splitSourceDirs);
    }

    if (codePaths.isEmpty()) {
        // If there are no code paths there's no need to setup a profile file and register with
        // the runtime,
        return;
    }

    final File profileFile = getPrimaryProfileFile(mPackageName);

    VMRuntime.registerAppInfo(profileFile.getPath(),
            codePaths.toArray(new String[codePaths.size()]));

    // Register the app data directory with the reporter. It will
    // help deciding whether or not a dex file is the primary apk or a
    // secondary dex.
    DexLoadReporter.getInstance().registerAppDataDir(mPackageName, mDataDir);
}
 

/** @hide */
static public int staticGetMemoryClass() {
    // Really brain dead right now -- just take this from the configured
    // vm heap size, and assume it is in megabytes and thus ends with "m".
    String vmHeapSize = SystemProperties.get("dalvik.vm.heapgrowthlimit", "");
    if (vmHeapSize != null && !"".equals(vmHeapSize)) {
        return Integer.parseInt(vmHeapSize.substring(0, vmHeapSize.length()-1));
    }
    return staticGetLargeMemoryClass();
}
 

public SystemServer() {
    // Check for factory test mode.
    mFactoryTestMode = FactoryTest.getMode();
    // Remember if it's runtime restart(when sys.boot_completed is already set) or reboot
    mRuntimeRestart = "1".equals(SystemProperties.get("sys.boot_completed"));

    mRuntimeStartElapsedTime = SystemClock.elapsedRealtime();
    mRuntimeStartUptime = SystemClock.uptimeMillis();
}
 

/**
 * Applies invoke-with system properties to the zygote arguments.
 *
 * @param args non-null; zygote args
 */
public static void applyInvokeWithSystemProperty(Arguments args) {
    if (args.invokeWith == null && args.niceName != null) {
        String property = "wrap." + args.niceName;
        args.invokeWith = SystemProperties.get(property);
        if (args.invokeWith != null && args.invokeWith.length() == 0) {
            args.invokeWith = null;
        }
    }
}
 

private void registerWifiDisplayAdapterLocked() {
    if (mContext.getResources().getBoolean(
            com.android.internal.R.bool.config_enableWifiDisplay)
            || SystemProperties.getInt(FORCE_WIFI_DISPLAY_ENABLE, -1) == 1) {
        mWifiDisplayAdapter = new WifiDisplayAdapter(
                mSyncRoot, mContext, mHandler, mDisplayAdapterListener,
                mPersistentDataStore);
        registerDisplayAdapterLocked(mWifiDisplayAdapter);
    }
}
 

private void recordTopInsetLocked(@Nullable LogicalDisplay d) {
    // We must only persist the inset after boot has completed, otherwise we will end up
    // overwriting the persisted value before the masking flag has been loaded from the
    // resource overlay.
    if (!mSystemReady || d == null) {
        return;
    }
    int topInset = d.getInsets().top;
    if (topInset == mDefaultDisplayTopInset) {
        return;
    }
    mDefaultDisplayTopInset = topInset;
    SystemProperties.set(PROP_DEFAULT_DISPLAY_TOP_INSET, Integer.toString(topInset));
}
 

/**
 * Gets the default page size to use when creating a database.
 */
public static int getDefaultPageSize() {
    synchronized (sLock) {
        if (sDefaultPageSize == 0) {
            // If there is an issue accessing /data, something is so seriously
            // wrong that we just let the IllegalArgumentException propagate.
            sDefaultPageSize = new StatFs("/data").getBlockSize();
        }
        return SystemProperties.getInt("debug.sqlite.pagesize", sDefaultPageSize);
    }
}
 

/**
 * Set the window manager for use by this Window to, for example,
 * display panels.  This is <em>not</em> used for displaying the
 * Window itself -- that must be done by the client.
 *
 * @param wm The window manager for adding new windows.
 */
public void setWindowManager(WindowManager wm, IBinder appToken, String appName,
        boolean hardwareAccelerated) {
    mAppToken = appToken;
    mAppName = appName;
    mHardwareAccelerated = hardwareAccelerated
            || SystemProperties.getBoolean(PROPERTY_HARDWARE_UI, false);
    if (wm == null) {
        wm = (WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE);
    }
    mWindowManager = ((WindowManagerImpl)wm).createLocalWindowManager(this);
}
 

/**
 * When opening a database, if the WAL file is larger than this size, we'll truncate it.
 *
 * (If it's 0, we do not truncate.)
 *
 * @hide
 */
public static long getWALTruncateSize() {
    final long setting = SQLiteCompatibilityWalFlags.getTruncateSize();
    if (setting >= 0) {
        return setting;
    }
    return SystemProperties.getInt("debug.sqlite.wal.truncatesize",
            Resources.getSystem().getInteger(
                    com.android.internal.R.integer.db_wal_truncate_size));
}
 

/**
 * Factory reset bluetooth settings.
 *
 * <p>Requires the {@link android.Manifest.permission#BLUETOOTH_PRIVILEGED}
 * permission
 *
 * @return true to indicate that the config file was successfully cleared
 * @hide
 */
public boolean factoryReset() {
    try {
        mServiceLock.readLock().lock();
        if (mService != null) {
            return mService.factoryReset();
        }
        SystemProperties.set("persist.bluetooth.factoryreset", "true");
    } catch (RemoteException e) {
        Log.e(TAG, "", e);
    } finally {
        mServiceLock.readLock().unlock();
    }
    return false;
}
 

private static int getDeviceDensity() {
    // qemu.sf.lcd_density can be used to override ro.sf.lcd_density
    // when running in the emulator, allowing for dynamic configurations.
    // The reason for this is that ro.sf.lcd_density is write-once and is
    // set by the init process when it parses build.prop before anything else.
    return SystemProperties.getInt("qemu.sf.lcd_density",
            SystemProperties.getInt("ro.sf.lcd_density", DENSITY_DEFAULT));
}
 

@Override
protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
    if (args != null) {
        for (final String arg : args) {
            if ("-a".equals(arg)) {
                // We currently dump all information by default
                continue;
            } else if ("--reset".equals(arg)) {
                reset();
                pw.println("binder_calls_stats reset.");
                return;
            } else if ("--enable-detailed-tracking".equals(arg)) {
                SystemProperties.set(PERSIST_SYS_BINDER_CALLS_DETAILED_TRACKING, "1");
                BinderCallsStats.getInstance().setDetailedTracking(true);
                pw.println("Detailed tracking enabled");
                return;
            } else if ("--disable-detailed-tracking".equals(arg)) {
                SystemProperties.set(PERSIST_SYS_BINDER_CALLS_DETAILED_TRACKING, "");
                BinderCallsStats.getInstance().setDetailedTracking(false);
                pw.println("Detailed tracking disabled");
                return;
            } else if ("-h".equals(arg)) {
                pw.println("binder_calls_stats commands:");
                pw.println("  --reset: Reset stats");
                pw.println("  --enable-detailed-tracking: Enables detailed tracking");
                pw.println("  --disable-detailed-tracking: Disables detailed tracking");
                return;
            } else {
                pw.println("Unknown option: " + arg);
            }
        }
    }
    BinderCallsStats.getInstance().dump(pw);
}
 

/**
 * Gets the WAL auto-checkpoint integer in database pages.
 */
public static int getWALAutoCheckpoint() {
    int value = SystemProperties.getInt("debug.sqlite.wal.autocheckpoint",
            Resources.getSystem().getInteger(
            com.android.internal.R.integer.db_wal_autocheckpoint));
    return Math.max(1, value);
}
 

void setTimeZoneImpl(String tz) {
    if (TextUtils.isEmpty(tz)) {
        return;
    }

    TimeZone zone = TimeZone.getTimeZone(tz);
    // Prevent reentrant calls from stepping on each other when writing
    // the time zone property
    boolean timeZoneWasChanged = false;
    synchronized (this) {
        String current = SystemProperties.get(TIMEZONE_PROPERTY);
        if (current == null || !current.equals(zone.getID())) {
            if (localLOGV) {
                Slog.v(TAG, "timezone changed: " + current + ", new=" + zone.getID());
            }
            timeZoneWasChanged = true;
            SystemProperties.set(TIMEZONE_PROPERTY, zone.getID());
        }

        // Update the kernel timezone information
        // Kernel tracks time offsets as 'minutes west of GMT'
        int gmtOffset = zone.getOffset(System.currentTimeMillis());
        setKernelTimezone(mNativeData, -(gmtOffset / 60000));
    }

    TimeZone.setDefault(null);

    if (timeZoneWasChanged) {
        Intent intent = new Intent(Intent.ACTION_TIMEZONE_CHANGED);
        intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING
                | Intent.FLAG_RECEIVER_INCLUDE_BACKGROUND
                | Intent.FLAG_RECEIVER_VISIBLE_TO_INSTANT_APPS);
        intent.putExtra("time-zone", zone.getID());
        getContext().sendBroadcastAsUser(intent, UserHandle.ALL);
    }
}