1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2006-2007. 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 <cstring>
#include <cstddef>
#include <cstdio> //std::remove
int main ()
{
using namespace boost::interprocess;
try{
//Create a file
std::filebuf fbuf;
fbuf.open("file.bin", std::ios_base::in | std::ios_base::out
| std::ios_base::trunc | std::ios_base::binary);
//Set the size
fbuf.pubseekoff(9999, std::ios_base::beg);
fbuf.sputc(0);
fbuf.close();
//Create a file mapping.
file_mapping m_file("file.bin", read_write);
//Map the whole file in this process
mapped_region region
(m_file //What to map
,read_write //Map it as read-write
);
if(region.get_size() != 10000)
return 1;
//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);
}
catch(interprocess_exception &ex){
std::remove("file.bin");
std::cout << ex.what() << std::endl;
return 1;
}
std::remove("file.bin");
return 0;
}
//]
#include <boost/interprocess/detail/config_end.hpp>
|
