michael@0: // Copyright (c) 2013 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #ifndef BASE_SCOPED_CLEAR_ERRNO_H_
michael@0: #define BASE_SCOPED_CLEAR_ERRNO_H_
michael@0: 
michael@0: #include <errno.h>
michael@0: 
michael@0: #include "base/basictypes.h"
michael@0: 
michael@0: namespace base {
michael@0: 
michael@0: // Simple scoper that saves the current value of errno, resets it to 0, and on
michael@0: // destruction puts the old value back.
michael@0: class ScopedClearErrno {
michael@0:  public:
michael@0:   ScopedClearErrno() : old_errno_(errno) {
michael@0:     errno = 0;
michael@0:   }
michael@0:   ~ScopedClearErrno() {
michael@0:     if (errno == 0)
michael@0:       errno = old_errno_;
michael@0:   }
michael@0: 
michael@0:  private:
michael@0:   const int old_errno_;
michael@0: 
michael@0:   DISALLOW_COPY_AND_ASSIGN(ScopedClearErrno);
michael@0: };
michael@0: 
michael@0: }  // namespace base
michael@0: 
michael@0: #endif  // BASE_SCOPED_CLEAR_ERRNO_H_