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- //////////////////////////////////////////////////////////////////////////////
- //
- // (C) Copyright Ion Gaztanaga 2006-2012. 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 <boost/interprocess/detail/config_begin.hpp>
- //[doc_file_mapping
- #include <boost/interprocess/file_mapping.hpp>
- #include <boost/interprocess/mapped_region.hpp>
- #include <iostream>
- #include <fstream>
- #include <string>
- #include <vector>
- #include <cstring>
- #include <cstddef>
- #include <cstdlib>
- //<-
- #include "../test/get_process_id_name.hpp"
- //->
- int main(int argc, char *argv[])
- {
- using namespace boost::interprocess;
- //Define file names
- //<-
- #if 1
- std::string file_name(boost::interprocess::ipcdetail::get_temporary_path());
- file_name += "/"; file_name += test::get_process_id_name();
- const char *FileName = file_name.c_str();
- #else
- //->
- const char *FileName = "file.bin";
- //<-
- #endif
- //->
- const std::size_t FileSize = 10000;
- if(argc == 1){ //Parent process executes this
- { //Create a file
- file_mapping::remove(FileName);
- std::filebuf fbuf;
- fbuf.open(FileName, std::ios_base::in | std::ios_base::out
- | std::ios_base::trunc | std::ios_base::binary);
- //Set the size
- fbuf.pubseekoff(FileSize-1, std::ios_base::beg);
- fbuf.sputc(0);
- }
- //Remove on exit
- struct file_remove
- {
- file_remove(const char *FileName)
- : FileName_(FileName) {}
- ~file_remove(){ file_mapping::remove(FileName_); }
- const char *FileName_;
- } remover(FileName);
- //Create a file mapping
- file_mapping m_file(FileName, read_write);
- //Map the whole file with read-write permissions in this process
- mapped_region region(m_file, read_write);
- //Get the address of the mapped region
- void * addr = region.get_address();
- std::size_t size = region.get_size();
- //Write all the memory to 1
- std::memset(addr, 1, size);
- //Launch child process
- std::string s(argv[0]); s += " child ";
- //<-
- s += "\""; s+= FileName; s += "\"";
- //->
- if(0 != std::system(s.c_str()))
- return 1;
- }
- else{ //Child process executes this
- { //Open the file mapping and map it as read-only
- //<-
- #if 1
- file_mapping m_file(argv[2], read_only);
- #else
- //->
- file_mapping m_file(FileName, read_only);
- //<-
- #endif
- //->
- mapped_region region(m_file, read_only);
- //Get the address of the mapped region
- void * addr = region.get_address();
- std::size_t size = region.get_size();
- //Check that memory was initialized to 1
- const char *mem = static_cast<char*>(addr);
- for(std::size_t i = 0; i < size; ++i)
- if(*mem++ != 1)
- return 1; //Error checking memory
- }
- { //Now test it reading the file
- std::filebuf fbuf;
- //<-
- #if 1
- fbuf.open(argv[2], std::ios_base::in | std::ios_base::binary);
- #else
- //->
- fbuf.open(FileName, std::ios_base::in | std::ios_base::binary);
- //<-
- #endif
- //->
- //Read it to memory
- std::vector<char> vect(FileSize, 0);
- fbuf.sgetn(&vect[0], std::streamsize(vect.size()));
- //Check that memory was initialized to 1
- const char *mem = static_cast<char*>(&vect[0]);
- for(std::size_t i = 0; i < FileSize; ++i)
- if(*mem++ != 1)
- return 1; //Error checking memory
- }
- }
- return 0;
- }
- //]
- #include <boost/interprocess/detail/config_end.hpp>
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