| // Copyright 2017 The Abseil Authors. | |
| // | |
| // 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 | |
| // | |
| // https://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. | |
| namespace absl { | |
| ABSL_NAMESPACE_BEGIN | |
| namespace base_internal { | |
| // `ErrnoSaver` captures the value of `errno` upon construction and restores it | |
| // upon deletion. It is used in low-level code and must be super fast. Do not | |
| // add instrumentation, even in debug modes. | |
| class ErrnoSaver { | |
| public: | |
| ErrnoSaver() : saved_errno_(errno) {} | |
| ~ErrnoSaver() { errno = saved_errno_; } | |
| int operator()() const { return saved_errno_; } | |
| private: | |
| const int saved_errno_; | |
| }; | |
| } // namespace base_internal | |
| ABSL_NAMESPACE_END | |
| } // namespace absl | |