1 // Copyright (C) 2020 The Android Open Source Project
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //      http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #pragma once
16 
17 #include <poll.h>
18 
19 #include <string>
20 #include <vector>
21 
22 #include "snapuserd_server.h"
23 
24 namespace android {
25 namespace snapshot {
26 
27 class Daemon {
28     // The Daemon class is a singleton to avoid
29     // instantiating more than once
30   public:
Daemon()31     Daemon() {}
32 
Instance()33     static Daemon& Instance() {
34         static Daemon instance;
35         return instance;
36     }
37 
38     bool StartServer(int argc, char** argv);
39     void Run();
40     void Interrupt();
41 
42   private:
43     // Signal mask used with ppoll()
44     sigset_t signal_mask_;
45 
46     Daemon(Daemon const&) = delete;
47     void operator=(Daemon const&) = delete;
48 
49     SnapuserdServer server_;
50     void MaskAllSignalsExceptIntAndTerm();
51     void MaskAllSignals();
52     static void SignalHandler(int signal);
53 };
54 
55 }  // namespace snapshot
56 }  // namespace android
57