50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
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// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/files/scoped_file.h"
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#include "base/logging.h"
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#include "build/build_config.h"
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#if defined(OS_POSIX) || defined(OS_FUCHSIA)
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#include <errno.h>
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#include <unistd.h>
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#include "base/posix/eintr_wrapper.h"
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#endif
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namespace base {
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namespace internal {
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#if defined(OS_POSIX) || defined(OS_FUCHSIA)
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// static
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void ScopedFDCloseTraits::Free(int fd) {
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// It's important to crash here.
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// There are security implications to not closing a file descriptor
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// properly. As file descriptors are "capabilities", keeping them open
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// would make the current process keep access to a resource. Much of
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// Chrome relies on being able to "drop" such access.
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// It's especially problematic on Linux with the setuid sandbox, where
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// a single open directory would bypass the entire security model.
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int ret = IGNORE_EINTR(close(fd));
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#if defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_FUCHSIA) || \
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defined(OS_ANDROID)
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// NB: Some file descriptors can return errors from close() e.g. network
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// filesystems such as NFS and Linux input devices. On Linux, macOS, and
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// Fuchsia's POSIX layer, errors from close other than EBADF do not indicate
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// failure to actually close the fd.
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if (ret != 0 && errno != EBADF)
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ret = 0;
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#endif
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PCHECK(0 == ret);
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}
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#endif // OS_POSIX || OS_FUCHSIA
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} // namespace internal
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} // namespace base
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