55 lines
1.3 KiB
C++
55 lines
1.3 KiB
C++
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// Copyright 2013 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/memory_mapped_file.h"
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "base/logging.h"
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#include "base/posix/eintr_wrapper.h"
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#include "base/threading/thread_restrictions.h"
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namespace base {
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MemoryMappedFile::MemoryMappedFile()
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: file_(kInvalidPlatformFileValue),
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data_(NULL),
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length_(0) {
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}
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bool MemoryMappedFile::MapFileToMemoryInternal() {
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ThreadRestrictions::AssertIOAllowed();
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struct stat file_stat;
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if (fstat(file_, &file_stat) == kInvalidPlatformFileValue) {
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DLOG(ERROR) << "Couldn't fstat " << file_ << ", errno " << errno;
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return false;
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}
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length_ = file_stat.st_size;
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data_ = static_cast<uint8*>(
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mmap(NULL, length_, PROT_READ, MAP_SHARED, file_, 0));
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if (data_ == MAP_FAILED)
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DLOG(ERROR) << "Couldn't mmap " << file_ << ", errno " << errno;
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return data_ != MAP_FAILED;
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}
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void MemoryMappedFile::CloseHandles() {
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ThreadRestrictions::AssertIOAllowed();
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if (data_ != NULL)
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munmap(data_, length_);
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if (file_ != kInvalidPlatformFileValue)
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ignore_result(HANDLE_EINTR(close(file_)));
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data_ = NULL;
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length_ = 0;
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file_ = kInvalidPlatformFileValue;
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}
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} // namespace base
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