| // Copyright 2018 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_SCOPED_CLEAR_LAST_ERROR_H_ |
| #define BASE_SCOPED_CLEAR_LAST_ERROR_H_ |
| |
| #include <errno.h> |
| |
| #include "base/base_export.h" |
| #include "build/build_config.h" |
| |
| namespace base { |
| |
| // ScopedClearLastError stores and resets the value of thread local error codes |
| // (errno, GetLastError()), and restores them in the destructor. This is useful |
| // to avoid side effects on these values in instrumentation functions that |
| // interact with the OS. |
| |
| // Common implementation of ScopedClearLastError for all platforms. Use |
| // ScopedClearLastError instead. |
| class BASE_EXPORT ScopedClearLastErrorBase { |
| public: |
| ScopedClearLastErrorBase() : last_errno_(errno) { errno = 0; } |
| ScopedClearLastErrorBase(const ScopedClearLastErrorBase&) = delete; |
| ScopedClearLastErrorBase& operator=(const ScopedClearLastErrorBase&) = delete; |
| ~ScopedClearLastErrorBase() { errno = last_errno_; } |
| |
| private: |
| const int last_errno_; |
| }; |
| |
| #if BUILDFLAG(IS_WIN) |
| |
| // Windows specific implementation of ScopedClearLastError. |
| class BASE_EXPORT ScopedClearLastError : public ScopedClearLastErrorBase { |
| public: |
| ScopedClearLastError(); |
| ScopedClearLastError(const ScopedClearLastError&) = delete; |
| ScopedClearLastError& operator=(const ScopedClearLastError&) = delete; |
| ~ScopedClearLastError(); |
| |
| private: |
| const unsigned long last_system_error_; |
| }; |
| |
| #elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA) |
| |
| using ScopedClearLastError = ScopedClearLastErrorBase; |
| |
| #endif // BUILDFLAG(IS_WIN) |
| |
| } // namespace base |
| |
| #endif // BASE_SCOPED_CLEAR_LAST_ERROR_H_ |