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// 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_
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