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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/files/memory_mapped_file.h"
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include "base/logging.h"
#include "base/posix/eintr_wrapper.h"
#include "base/threading/thread_restrictions.h"
namespace base {
MemoryMappedFile::MemoryMappedFile()
: file_(kInvalidPlatformFileValue),
data_(NULL),
length_(0) {
}
bool MemoryMappedFile::MapFileToMemoryInternal() {
ThreadRestrictions::AssertIOAllowed();
struct stat file_stat;
if (fstat(file_, &file_stat) == kInvalidPlatformFileValue) {
DLOG(ERROR) << "Couldn't fstat " << file_ << ", errno " << errno;
return false;
}
length_ = file_stat.st_size;
data_ = static_cast<uint8*>(
mmap(NULL, length_, PROT_READ, MAP_SHARED, file_, 0));
if (data_ == MAP_FAILED)
DLOG(ERROR) << "Couldn't mmap " << file_ << ", errno " << errno;
return data_ != MAP_FAILED;
}
void MemoryMappedFile::CloseHandles() {
ThreadRestrictions::AssertIOAllowed();
if (data_ != NULL)
munmap(data_, length_);
if (file_ != kInvalidPlatformFileValue)
ignore_result(HANDLE_EINTR(close(file_)));
data_ = NULL;
length_ = 0;
file_ = kInvalidPlatformFileValue;
}
} // namespace base
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