// Copyright 2014 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.

#include "butil/files/scoped_file.h"

#include "butil/logging.h"

#if defined(OS_POSIX)

#include <unistd.h>

#include "butil/posix/eintr_wrapper.h"

#endif

namespace butil {

namespace internal {

#if defined(OS_POSIX)

// static

void ScopedFDCloseTraits::Free(int fd) {

  // It's important to crash here.

  // There are security implications to not closing a file descriptor

  // properly. As file descriptors are "capabilities", keeping them open

  // would make the current process keep access to a resource. Much of

  // Chrome relies on being able to "drop" such access.

  // It's especially problematic on Linux with the setuid sandbox, where

  // a single open directory would bypass the entire security model.

  PCHECK(0 == IGNORE_EINTR(close(fd)));

}

#endif  // OS_POSIX

}  // namespace internal

}  // namespace butil