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/*
* Copyright (c) 2019 ARM Limited.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#if !defined(BARE_METAL)
#include "arm_compute/core/utils/misc/MMappedFile.h"
#include <cstdio>
#include <cstring>
#include <tuple>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
namespace arm_compute
{
namespace utils
{
namespace mmap_io
{
namespace
{
/** File size accessor
*
* @param[in] filename File to extract its size
*
* @return A pair of size and status.
*/
std::pair<size_t, bool> get_file_size(const std::string &filename)
{
struct stat st; // NOLINT
memset(&st, 0, sizeof(struct stat));
if(stat(filename.c_str(), &st) == 0)
{
return std::make_pair(st.st_size, true);
}
else
{
return std::make_pair(0, false);
}
}
/** Get OS page size
*
* @return Page size
*/
size_t get_page_size()
{
return sysconf(_SC_PAGESIZE);
}
} // namespace
MMappedFile::MMappedFile()
: _filename(), _file_size(0), _map_size(0), _map_offset(0), _fp(nullptr), _data(nullptr)
{
}
MMappedFile::MMappedFile(std::string filename, size_t size, size_t offset)
: _filename(std::move(filename)), _file_size(0), _map_size(size), _map_offset(offset), _fp(nullptr), _data(nullptr)
{
map(_filename, _map_size, _map_offset);
}
MMappedFile::~MMappedFile()
{
release();
}
bool MMappedFile::map(const std::string &filename, size_t size, size_t offset)
{
// Check if file is mapped
if(is_mapped())
{
return false;
}
// Open file
_fp = fopen(filename.c_str(), "a+be");
if(_fp == nullptr)
{
return false;
}
// Extract file descriptor
int fd = fileno(_fp);
bool status = fd >= 0;
if(status)
{
// Get file size
std::tie(_file_size, status) = get_file_size(_filename);
if(status)
{
// Map all file from offset if map size is 0
_map_size = (size == 0) ? _file_size : size;
_map_offset = offset;
// Check offset mapping
if((_map_offset > _file_size) || (_map_offset % get_page_size() != 0))
{
status = false;
}
else
{
// Truncate to file size
if(_map_offset + _map_size > _file_size)
{
_map_size = _file_size - _map_offset;
}
// Perform mapping
_data = ::mmap(nullptr, _map_size, PROT_WRITE, MAP_SHARED, fd, _map_offset);
}
}
}
if(!status)
{
fclose(_fp);
}
return status;
}
void MMappedFile::release()
{
// Unmap file
if(_data != nullptr)
{
::munmap(_data, _file_size);
_data = nullptr;
}
// Close file
if(_fp != nullptr)
{
fclose(_fp);
_fp = nullptr;
}
// Clear variables
_file_size = 0;
_map_size = 0;
_map_offset = 0;
}
unsigned char *MMappedFile::data()
{
return static_cast<unsigned char *>(_data);
}
size_t MMappedFile::file_size() const
{
return _file_size;
}
size_t MMappedFile::map_size() const
{
return _map_size;
}
bool MMappedFile::is_mapped() const
{
return _data != nullptr;
}
} // namespace mmap_io
} // namespace utils
} // namespace arm_compute
#endif // !defined(BARE_METAL)
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