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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2004-2012. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/interprocess for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#include <ios> //std::streamoff
#include <fstream> //std::ofstream, std::ifstream
#include <iostream>
#include <boost/interprocess/file_mapping.hpp>
#include <boost/interprocess/mapped_region.hpp>
#include <boost/container/vector.hpp>
#include <stdexcept> //std::exception
#include <cstddef> //std::size_t
#include "get_process_id_name.hpp"
using namespace boost::interprocess;
file_mapping get_file_mapping()
{
file_mapping f;
return file_mapping(boost::move(f));
}
int main ()
{
BOOST_TRY{
const std::size_t FileSize = 99999*2;
{
//Create file with given size
std::ofstream file(get_filename().c_str(), std::ios::binary | std::ios::trunc);
file.seekp(static_cast<std::streamoff>(FileSize-1));
file.write("", 1);
}
{
//Create a file mapping
file_mapping mapping(get_filename().c_str(), read_write);
//Create two mapped regions, one half of the file each
mapped_region region (mapping
,read_write
,0
,FileSize/2
);
mapped_region region2(mapping
,read_write
,FileSize/2
,FileSize - FileSize/2
);
//Fill two regions with a pattern
unsigned char *filler = static_cast<unsigned char*>(region.get_address());
for(std::size_t i = 0
;i < FileSize/2
;++i){
*filler++ = static_cast<unsigned char>(i);
}
filler = static_cast<unsigned char*>(region2.get_address());
for(std::size_t i = FileSize/2
;i < FileSize
;++i){
*filler++ = static_cast<unsigned char>(i);
}
if(!region.flush(0, 0, false)){
return 1;
}
if(!region2.flush(0, 0, true)){
return 1;
}
}
//See if the pattern is correct in the file
{
//Open the file
std::ifstream file(get_filename().c_str(), std::ios::binary);
//Create a memory buffer
boost::container::vector<unsigned char> memory(FileSize/2 +1);
//Fill buffer
file.read(static_cast<char*>(static_cast<void*>(memory.data()))
, FileSize/2);
unsigned char *checker = memory.data();
//Check pattern
for(std::size_t i = 0
;i < FileSize/2
;++i){
if(*checker++ != static_cast<unsigned char>(i)){
return 1;
}
}
//Fill buffer
file.read(static_cast<char*>(static_cast<void*>(memory.data()))
, FileSize - FileSize/2);
checker = memory.data();
//Check pattern
for(std::size_t i = FileSize/2
;i < FileSize
;++i){
if(*checker++ != static_cast<unsigned char>(i)){
return 1;
}
}
}
//Now check the pattern mapping a single read only mapped_region
{
//Create a file mapping
file_mapping mapping(get_filename().c_str(), read_only);
//Create a single regions, mapping all the file
mapped_region region (mapping
,read_only
);
//Check pattern
unsigned char *pattern = static_cast<unsigned char*>(region.get_address());
for(std::size_t i = 0
;i < FileSize
;++i, ++pattern){
if(*pattern != static_cast<unsigned char>(i)){
return 1;
}
}
}
#ifdef BOOST_INTERPROCESS_WCHAR_NAMED_RESOURCES
{
//Create a file mapping
file_mapping mapping(get_wfilename().c_str(), read_only);
//Create a single regions, mapping all the file
mapped_region region (mapping
,read_only
);
//Check pattern
unsigned char *pattern = static_cast<unsigned char*>(region.get_address());
for(std::size_t i = 0
;i < FileSize
;++i, ++pattern){
if(*pattern != static_cast<unsigned char>(i)){
return 1;
}
}
}
#endif //BOOST_INTERPROCESS_WCHAR_NAMED_RESOURCES
{
//Now test move semantics
file_mapping mapping(get_filename().c_str(), read_only);
file_mapping move_ctor(boost::move(mapping));
file_mapping move_assign;
move_assign = boost::move(move_ctor);
mapping.swap(move_assign);
file_mapping ret(get_file_mapping());
}
}
BOOST_CATCH(std::exception &exc){
file_mapping::remove(get_filename().c_str());
std::cout << "Unhandled exception: " << exc.what() << std::endl;
BOOST_RETHROW
} BOOST_CATCH_END
file_mapping::remove(get_filename().c_str());
return 0;
}
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