1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "base/files/memory_mapped_file.h"
11 #include "base/logging.h"
12 #include "base/threading/thread_restrictions.h"
16 MemoryMappedFile::MemoryMappedFile() : data_(NULL), length_(0) {
19 bool MemoryMappedFile::MapFileToMemory() {
20 ThreadRestrictions::AssertIOAllowed();
22 struct stat file_stat;
23 if (fstat(file_.GetPlatformFile(), &file_stat) == -1 ) {
24 DPLOG(ERROR) << "fstat " << file_.GetPlatformFile();
27 length_ = file_stat.st_size;
29 data_ = static_cast<uint8*>(
30 mmap(NULL, length_, PROT_READ, MAP_SHARED, file_.GetPlatformFile(), 0));
31 if (data_ == MAP_FAILED)
32 DPLOG(ERROR) << "mmap " << file_.GetPlatformFile();
34 return data_ != MAP_FAILED;
37 void MemoryMappedFile::CloseHandles() {
38 ThreadRestrictions::AssertIOAllowed();
41 munmap(data_, length_);