1 /*
2  * Copyright (C) 2020 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 #pragma once
18 
19 #include "errno.h"
20 
21 #include "android-base/macros.h"
22 
23 namespace android {
24 namespace base {
25 
26 class ErrnoRestorer {
27  public:
ErrnoRestorer()28   ErrnoRestorer() : saved_errno_(errno) {}
29 
~ErrnoRestorer()30   ~ErrnoRestorer() { errno = saved_errno_; }
31 
32   // Allow this object to be used as part of && operation.
33   operator bool() const { return true; }
34 
35  private:
36   const int saved_errno_;
37 
38   DISALLOW_COPY_AND_ASSIGN(ErrnoRestorer);
39 };
40 
41 }  // namespace base
42 }  // namespace android
43