1 //////////////////////////////////////////////////////////////////////////////
2 //
3 // (C) Copyright Ion Gaztanaga 2006-2012. Distributed under the Boost
4 // Software License, Version 1.0. (See accompanying file
5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 //
7 // See http://www.boost.org/libs/interprocess for documentation.
8 //
9 //////////////////////////////////////////////////////////////////////////////
10 #include <boost/interprocess/detail/config_begin.hpp>
11 //[doc_shared_memory
12 #include <boost/interprocess/shared_memory_object.hpp>
13 #include <boost/interprocess/mapped_region.hpp>
14 #include <cstring>
15 #include <cstdlib>
16 #include <string>
17 //<-
18 #include "../test/get_process_id_name.hpp"
19 //->
20
main(int argc,char * argv[])21 int main(int argc, char *argv[])
22 {
23 using namespace boost::interprocess;
24
25 if(argc == 1){ //Parent process
26 //Remove shared memory on construction and destruction
27 struct shm_remove
28 {
29 //<-
30 #if 1
31 shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
32 ~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
33 #else
34 //->
35 shm_remove() { shared_memory_object::remove("MySharedMemory"); }
36 ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
37 //<-
38 #endif
39 //->
40 } remover;
41 //<-
42 (void)remover;
43 //->
44
45 //Create a shared memory object.
46 //<-
47 #if 1
48 shared_memory_object shm (create_only, test::get_process_id_name(), read_write);
49 #else
50 //->
51 shared_memory_object shm (create_only, "MySharedMemory", read_write);
52 //<-
53 #endif
54 //->
55
56 //Set size
57 shm.truncate(1000);
58
59 //Map the whole shared memory in this process
60 mapped_region region(shm, read_write);
61
62 //Write all the memory to 1
63 std::memset(region.get_address(), 1, region.get_size());
64
65 //Launch child process
66 std::string s(argv[0]); s += " child ";
67 //<-
68 s += test::get_process_id_name();
69 //->
70 if(0 != std::system(s.c_str()))
71 return 1;
72 }
73 else{
74 //Open already created shared memory object.
75 //<-
76 #if 1
77 shared_memory_object shm (open_only, argv[2], read_only);
78 #else
79 //->
80 shared_memory_object shm (open_only, "MySharedMemory", read_only);
81 //<-
82 #endif
83 //->
84
85 //Map the whole shared memory in this process
86 mapped_region region(shm, read_only);
87
88 //Check that memory was initialized to 1
89 char *mem = static_cast<char*>(region.get_address());
90 for(std::size_t i = 0; i < region.get_size(); ++i)
91 if(*mem++ != 1)
92 return 1; //Error checking memory
93 }
94 return 0;
95 }
96 //]
97 #include <boost/interprocess/detail/config_end.hpp>
98