1 /*
2  * Copyright (C) 2019 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.commands.svc;
18 
19 import android.app.ActivityManager;
20 import android.os.ParcelFileDescriptor;
21 
22 import java.io.FileInputStream;
23 
24 public class SystemServerCommand extends Svc.Command {
SystemServerCommand()25     public SystemServerCommand() {
26         super("system-server");
27     }
28 
29     @Override
shortHelp()30     public String shortHelp() {
31         return "System server process related command";
32     }
33 
34     @Override
longHelp()35     public String longHelp() {
36         return shortHelp() + "\n"
37                 + "\n"
38                 + "usage: system-server wait-for-crash\n"
39                 + "         Wait until the system server process crashes.\n\n";
40     }
41 
waitForCrash()42     private void waitForCrash() throws Exception {
43         ParcelFileDescriptor fd = ActivityManager.getService().getLifeMonitor();
44         if (fd == null) {
45             System.err.println("Unable to get life monitor.");
46             return;
47         }
48         System.out.println("Waiting for the system server process to die...");
49         new FileInputStream(fd.getFileDescriptor()).read();
50     }
51 
52     @Override
run(String[] args)53     public void run(String[] args) {
54         try {
55             if (args.length > 1) {
56                 switch (args[1]) {
57                     case "wait-for-crash":
58                         waitForCrash();
59                         return;
60                 }
61             }
62         } catch (Exception e) {
63             e.printStackTrace();
64         }
65         System.err.println(longHelp());
66     }
67 }
68