thomasvl@chromium.org
a2477a2581
a kext) :) Review URL: http://codereview.chromium.org/42391 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@12090 0039d316-1c4b-4281-b951-d872f2087c98
37 linhas
1.1 KiB
C++
37 linhas
1.1 KiB
C++
// Copyright (c) 2008 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_file_util.h"
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#include <sys/mman.h>
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#include <errno.h>
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#include "base/logging.h"
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#include "base/file_util.h"
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namespace file_util {
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bool EvictFileFromSystemCache(const FilePath& file) {
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// There aren't any really direct ways to purge a file from the UBC. From
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// talking with Amit Singh, the safest is to mmap the file with MAP_FILE (the
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// default) + MAP_SHARED, then do an msync to invalidate the memory. The next
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// open should then have to load the file from disk.
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file_util::MemoryMappedFile mapped_file;
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if (!mapped_file.Initialize(file)) {
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DLOG(WARNING) << "failed to memory map " << file.value();
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return false;
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}
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if (msync(const_cast<uint8*>(mapped_file.data()), mapped_file.length(),
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MS_INVALIDATE) != 0) {
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DLOG(WARNING) << "failed to invalidate memory map of " << file.value()
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<< ", errno: " << errno;
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return false;
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}
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return true;
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}
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} // namespace file_util
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