content: /*
   * Copyright (C) 2019 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.commands.svc;
  
  import android.app.ActivityManager;
  import android.os.ParcelFileDescriptor;
  
  import java.io.FileInputStream;
  
  public class SystemServerCommand extends Svc.Command {
      public SystemServerCommand() {
          super("system-server");
      }
  
      @Override
      public String shortHelp() {
          return "System server process related command";
      }
  
      @Override
      public String longHelp() {
          return shortHelp() + "\n"
                  + "\n"
                  + "usage: system-server wait-for-crash\n"
                  + "         Wait until the system server process crashes.\n\n";
      }
  
      private void waitForCrash() throws Exception {
          ParcelFileDescriptor fd = ActivityManager.getService().getLifeMonitor();
          if (fd == null) {
              System.err.println("Unable to get life monitor.");
              return;
          }
          System.out.println("Waiting for the system server process to die...");
          new FileInputStream(fd.getFileDescriptor()).read();
      }
  
      @Override
      public void run(String[] args) {
          try {
              if (args.length > 1) {
                  switch (args[1]) {
                      case "wait-for-crash":
                          waitForCrash();
                          return;
                  }
              }
          } catch (Exception e) {
              e.printStackTrace();
          }
          System.err.println(longHelp());
      }
  }
  