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_