content: package com.termux.shared.android;
  
  import android.Manifest;
  import android.content.Context;
  
  import androidx.annotation.NonNull;
  import androidx.annotation.Nullable;
  
  import com.termux.shared.logger.Logger;
  import com.termux.shared.shell.command.environment.AndroidShellEnvironment;
  import com.termux.shared.shell.command.ExecutionCommand;
  import com.termux.shared.shell.command.runner.app.AppShell;
  
  /**
   * Utils for phantom processes added in android 12.
   *
   * https://github.com/termux/termux-app/issues/2366
   * https://issuetracker.google.com/u/1/issues/205156966#comment28
   * https://cs.android.com/android/_/android/platform/frameworks/base/+/09dcdad5
   * https://github.com/agnostic-apollo/Android-Docs/tree/master/ocs/apps/processes/phantom-cached-and-empty-processes.md
   */
  public class PhantomProcessUtils {
  
      private static final String LOG_TAG = "PhantomProcessUtils";
  
      /**
       * If feature flag set to false, then will disable trimming of phantom process and processes using
       * excessive CPU. Flag is available on Pixel Android 12L beta 3 and Android 13. Availability on
       * other devices will depend on if other vendors merged the 09dcdad5 commit or not in their releases
       * and if they actually want to support the flag. Check {@link FeatureFlagUtils} javadocs for
       * more details.
       */
      public static final String FEATURE_FLAG_SETTINGS_ENABLE_MONITOR_PHANTOM_PROCS = "settings_enable_monitor_phantom_procs";
  
      /**
       * Maximum number of allowed phantom processes. It is also used as the label for the currently
       * enforced ActivityManagerConstants MAX_PHANTOM_PROCESSES value in the `dumpsys activity settings`
       * output.
       *
       * https://cs.android.com/android/platform/superproject/+/android-12.0.0_r4:frameworks/base/services/core/java/com/android/server/am/ActivityManagerConstants.java;l=574
       * https://cs.android.com/android/platform/superproject/+/android-12.0.0_r4:frameworks/base/services/core/java/com/android/server/am/ActivityManagerConstants.java;l=172
       */
      public static final String KEY_MAX_PHANTOM_PROCESSES = "max_phantom_processes";
  
      /**
       * Whether or not syncs (bulk set operations) for DeviceConfig are disabled currently. The value
       * is boolean (1 or 0). The value '1' means that DeviceConfig#setProperties(DeviceConfig.Properties)
       * will return {@code false}.
       *
       * https://cs.android.com/android/platform/superproject/+/android-12.0.0_r4:frameworks/base/core/java/android/provider/DeviceConfig.java
       * https://cs.android.com/android/platform/superproject/+/android-12.0.0_r4:frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java;l=1186
       * https://cs.android.com/android/platform/superproject/+/android-12.0.0_r4:frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java;l=1142
       */
      public static final String SETTINGS_GLOBAL_DEVICE_CONFIG_SYNC_DISABLED = "device_config_sync_disabled";
  
      /**
       * Get {@link #FEATURE_FLAG_SETTINGS_ENABLE_MONITOR_PHANTOM_PROCS} feature flag value.
       *
       * @param context The {@link Context} for operations.
       * @return Returns {@link FeatureFlagUtils.FeatureFlagValue}.
       */
      @NonNull
      public static FeatureFlagUtils.FeatureFlagValue getFeatureFlagMonitorPhantomProcsValueString(@NonNull Context context) {
          return FeatureFlagUtils.getFeatureFlagValueString(context, FEATURE_FLAG_SETTINGS_ENABLE_MONITOR_PHANTOM_PROCS);
      }
  
      /**
       * Get currently enforced ActivityManagerConstants MAX_PHANTOM_PROCESSES value, defaults to 32.
       * Can be changed by modifying device config activity_manager namespace "max_phantom_processes" value.
       *
       * @param context The {@link Context} for operations.
       * @return Returns {@link Integer}.
       */
      @Nullable
      public static Integer getActivityManagerMaxPhantomProcesses(@NonNull Context context) {
          if (!PermissionUtils.checkPermissions(context, new String[]{Manifest.permission.DUMP, Manifest.permission.PACKAGE_USAGE_STATS})) {
              return null;
          }
  
          // Dumpsys logs the currently enforced MAX_PHANTOM_PROCESSES value and not the device config setting.
          String script = "/system/bin/dumpsys activity settings | /system/bin/grep -iE '^[\t ]+" + KEY_MAX_PHANTOM_PROCESSES + "=[0-9]+$' | /system/bin/cut -d = -f2";
          ExecutionCommand executionCommand = new ExecutionCommand(-1, "/system/bin/sh", null,
              script + "\n", "/", ExecutionCommand.Runner.APP_SHELL.getName(), true);
          executionCommand.commandLabel = " ActivityManager " + KEY_MAX_PHANTOM_PROCESSES + " Command";
          executionCommand.backgroundCustomLogLevel = Logger.LOG_LEVEL_OFF;
          AppShell appShell = AppShell.execute(context, executionCommand, null, new AndroidShellEnvironment(), null, true);
          boolean stderrSet = !executionCommand.resultData.stderr.toString().isEmpty();
          if (appShell == null || !executionCommand.isSuccessful() || executionCommand.resultData.exitCode != 0 || stderrSet) {
              Logger.logErrorExtended(LOG_TAG, executionCommand.toString());
              return null;
          }
  
          try {
              return Integer.parseInt(executionCommand.resultData.stdout.toString().trim());
          } catch (NumberFormatException e) {
              Logger.logStackTraceWithMessage(LOG_TAG, "The " + executionCommand.commandLabel + " did not return a valid integer", e);
              Logger.logErrorExtended(LOG_TAG, executionCommand.toString());
          }
  
          return null;
      }
  
      /**
       * Get {@link #SETTINGS_GLOBAL_DEVICE_CONFIG_SYNC_DISABLED} settings value.
       *
       * @param context The {@link Context} for operations.
       * @return Returns {@link Integer}.
       */
      @Nullable
      public static Integer getSettingsGlobalDeviceConfigSyncDisabled(@NonNull Context context) {
          return (Integer) SettingsProviderUtils.getSettingsValue(context, SettingsProviderUtils.SettingNamespace.GLOBAL,
              SettingsProviderUtils.SettingType.INT, SETTINGS_GLOBAL_DEVICE_CONFIG_SYNC_DISABLED, null);
      }
  
  }
  