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55 lines
1.2 KiB
C++
55 lines
1.2 KiB
C++
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// Copyright (c) 2012 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 "net/disk_cache/blockfile/mapped_file.h"
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#include <errno.h>
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#include <sys/mman.h>
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#include "base/files/file_path.h"
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#include "base/logging.h"
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#include "net/disk_cache/disk_cache.h"
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namespace disk_cache {
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void* MappedFile::Init(const base::FilePath& name, size_t size) {
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DCHECK(!init_);
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if (init_ || !File::Init(name))
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return NULL;
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size_t temp_len = size ? size : 4096;
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if (!size)
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size = GetLength();
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buffer_ = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED,
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platform_file(), 0);
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init_ = true;
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view_size_ = size;
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DPLOG_IF(FATAL, buffer_ == MAP_FAILED) << "Failed to mmap " << name.value();
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if (buffer_ == MAP_FAILED)
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buffer_ = 0;
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// Make sure we detect hardware failures reading the headers.
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std::unique_ptr<char[]> temp(new char[temp_len]);
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if (!Read(temp.get(), temp_len, 0))
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return NULL;
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return buffer_;
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}
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void MappedFile::Flush() {
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}
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MappedFile::~MappedFile() {
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if (!init_)
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return;
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if (buffer_) {
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int ret = munmap(buffer_, view_size_);
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DCHECK_EQ(0, ret);
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}
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}
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} // namespace disk_cache
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