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// 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 "base/files/scoped_file.h"
#include "base/logging.h"
#include "build/build_config.h"
#if defined(OS_POSIX)
#include <errno.h>
#include <unistd.h>
#include "base/debug/alias.h"
#include "base/posix/eintr_wrapper.h"
#endif
namespace base {
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.
int ret = IGNORE_EINTR(close(fd));
// TODO(davidben): Remove this once it's been determined whether
// https://crbug.com/603354 is caused by EBADF or a network filesystem
// returning some other error.
int close_errno = errno;
base::debug::Alias(&close_errno);
#if defined(OS_LINUX)
// NB: Some file descriptors can return errors from close() e.g. network
// filesystems such as NFS and Linux input devices. On Linux, errors from
// close other than EBADF do not indicate failure to actually close the fd.
if (ret != 0 && errno != EBADF)
ret = 0;
#endif
PCHECK(0 == ret);
}
#endif // OS_POSIX
} // namespace internal
} // namespace base
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