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60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
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// Copyright (c) 2011 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/test/test_file_util.h"
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#if defined(OS_ANDROID)
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#include <asm/unistd.h>
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#include <errno.h>
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#include <linux/fadvise.h>
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#include <sys/syscall.h>
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#endif
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#include "base/files/file_path.h"
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#include "base/files/scoped_file.h"
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namespace base {
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// Inconveniently, the NDK doesn't provide for posix_fadvise
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// until native API level = 21, which we don't use yet, so provide a wrapper, at
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// least on ARM32
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#if defined(OS_ANDROID) && __ANDROID_API__ < 21
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namespace {
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int posix_fadvise(int fd, off_t offset, off_t len, int advice) {
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#if defined(ARCH_CPU_ARMEL)
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// Note that the syscall argument order on ARM is different from the C
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// function; this is helpfully documented in the Linux posix_fadvise manpage.
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return syscall(__NR_arm_fadvise64_64, fd, advice,
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0, // Upper 32-bits for offset
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offset,
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0, // Upper 32-bits for length
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len);
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#endif
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NOTIMPLEMENTED();
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return ENOSYS;
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}
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} // namespace
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#endif // OS_ANDROID
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bool EvictFileFromSystemCache(const FilePath& file) {
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ScopedFD fd(open(file.value().c_str(), O_RDONLY));
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if (!fd.is_valid())
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return false;
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if (fdatasync(fd.get()) != 0)
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return false;
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if (posix_fadvise(fd.get(), 0, 0, POSIX_FADV_DONTNEED) != 0)
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return false;
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return true;
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}
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} // namespace base
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