1 //
2 // Copyright (C) 2012 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 #include "update_engine/common/terminator.h"
18 
19 #include <cstdlib>
20 
21 namespace chromeos_update_engine {
22 
23 volatile sig_atomic_t Terminator::exit_status_ = 1;  // default exit status
24 volatile sig_atomic_t Terminator::exit_blocked_ = 0;
25 volatile sig_atomic_t Terminator::exit_requested_ = 0;
26 
Init()27 void Terminator::Init() {
28   exit_blocked_ = 0;
29   exit_requested_ = 0;
30   signal(SIGTERM, HandleSignal);
31 }
32 
Init(int exit_status)33 void Terminator::Init(int exit_status) {
34   exit_status_ = exit_status;
35   Init();
36 }
37 
Exit()38 void Terminator::Exit() {
39   exit(exit_status_);
40 }
41 
HandleSignal(int signum)42 void Terminator::HandleSignal(int signum) {
43   if (exit_blocked_ == 0) {
44     Exit();
45   }
46   exit_requested_ = 1;
47 }
48 
~ScopedTerminatorExitUnblocker()49 ScopedTerminatorExitUnblocker::~ScopedTerminatorExitUnblocker() {
50   Terminator::set_exit_blocked(false);
51   if (Terminator::exit_requested()) {
52     Terminator::Exit();
53   }
54 }
55 
56 }  // namespace chromeos_update_engine
57