diff options
Diffstat (limited to 'security/sandbox/chromium/base/scoped_clear_last_error.h')
-rw-r--r-- | security/sandbox/chromium/base/scoped_clear_last_error.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/security/sandbox/chromium/base/scoped_clear_last_error.h b/security/sandbox/chromium/base/scoped_clear_last_error.h new file mode 100644 index 0000000000..b19f0436ae --- /dev/null +++ b/security/sandbox/chromium/base/scoped_clear_last_error.h @@ -0,0 +1,58 @@ +// Copyright (c) 2018 The Chromium Authors. All rights reserved. +// 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 "base/macros.h" +#include "build/build_config.h" + +namespace base { +namespace internal { + +// 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() { errno = last_errno_; } + + private: + const int last_errno_; + + DISALLOW_COPY_AND_ASSIGN(ScopedClearLastErrorBase); +}; + +#if defined(OS_WIN) + +// Windows specific implementation of ScopedClearLastError. +class BASE_EXPORT ScopedClearLastError : public ScopedClearLastErrorBase { + public: + ScopedClearLastError(); + ~ScopedClearLastError(); + + private: + unsigned int last_system_error_; + + DISALLOW_COPY_AND_ASSIGN(ScopedClearLastError); +}; + +#elif defined(OS_POSIX) || defined(OS_FUCHSIA) + +using ScopedClearLastError = ScopedClearLastErrorBase; + +#endif // defined(OS_WIN) + +} // namespace internal +} // namespace base + +#endif // BASE_SCOPED_CLEAR_LAST_ERROR_H_ |