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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/check.h"
- #include "build/build_config.h"
- #if BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
- #include <errno.h>
- #include <unistd.h>
- #include "base/posix/eintr_wrapper.h"
- #endif
- namespace base {
- namespace internal {
- #if BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
- // 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));
- #if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_APPLE) || \
- BUILDFLAG(IS_FUCHSIA) || BUILDFLAG(IS_ANDROID)
- // NB: Some file descriptors can return errors from close() e.g. network
- // filesystems such as NFS and Linux input devices. On Linux, macOS, and
- // Fuchsia's POSIX layer, 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 // BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
- } // namespace internal
- } // namespace base
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