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1 | ////////////////////////////////////////////////////////////////////////////// |
2 | // | |
3 | // (C) Copyright Ion Gaztanaga 2005-2012. 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 | ||
11 | #ifndef BOOST_INTERPROCESS_ANONYMOUS_SHARED_MEMORY_HPP | |
12 | #define BOOST_INTERPROCESS_ANONYMOUS_SHARED_MEMORY_HPP | |
13 | ||
14 | #ifndef BOOST_CONFIG_HPP | |
15 | # include <boost/config.hpp> | |
16 | #endif | |
17 | # | |
18 | #if defined(BOOST_HAS_PRAGMA_ONCE) | |
19 | # pragma once | |
20 | #endif | |
21 | ||
22 | #include <boost/interprocess/detail/config_begin.hpp> | |
23 | #include <boost/interprocess/detail/workaround.hpp> | |
24 | #include <boost/interprocess/creation_tags.hpp> | |
25 | #include <boost/move/move.hpp> | |
26 | #include <boost/interprocess/interprocess_fwd.hpp> | |
27 | #include <boost/interprocess/mapped_region.hpp> | |
28 | #include <cstddef> | |
29 | ||
30 | #if (!defined(BOOST_INTERPROCESS_WINDOWS)) | |
31 | # include <fcntl.h> //open, O_CREAT, O_*... | |
32 | # include <sys/mman.h> //mmap | |
33 | # include <sys/stat.h> //mode_t, S_IRWXG, S_IRWXO, S_IRWXU, | |
34 | #else | |
35 | #include <boost/interprocess/windows_shared_memory.hpp> | |
36 | #endif | |
37 | ||
38 | ||
39 | //!\file | |
40 | //!Describes a function that creates anonymous shared memory that can be | |
41 | //!shared between forked processes | |
42 | ||
43 | namespace boost { | |
44 | namespace interprocess { | |
45 | ||
46 | #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED) | |
47 | ||
48 | namespace ipcdetail{ | |
49 | ||
50 | class raw_mapped_region_creator | |
51 | { | |
52 | public: | |
53 | static mapped_region | |
54 | create_posix_mapped_region(void *address, std::size_t size) | |
55 | { | |
56 | mapped_region region; | |
57 | region.m_base = address; | |
58 | region.m_size = size; | |
59 | return region; | |
60 | } | |
61 | }; | |
62 | } | |
63 | ||
64 | #endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED | |
65 | ||
66 | //!A function that creates an anonymous shared memory segment of size "size". | |
67 | //!If "address" is passed the function will try to map the segment in that address. | |
68 | //!Otherwise the operating system will choose the mapping address. | |
69 | //!The function returns a mapped_region holding that segment or throws | |
70 | //!interprocess_exception if the function fails. | |
71 | //static mapped_region | |
72 | static mapped_region | |
73 | anonymous_shared_memory(std::size_t size, void *address = 0) | |
74 | #if (!defined(BOOST_INTERPROCESS_WINDOWS)) | |
75 | { | |
76 | int flags; | |
77 | int fd = -1; | |
78 | ||
79 | #if defined(MAP_ANONYMOUS) //Use MAP_ANONYMOUS | |
80 | flags = MAP_ANONYMOUS | MAP_SHARED; | |
81 | #elif !defined(MAP_ANONYMOUS) && defined(MAP_ANON) //use MAP_ANON | |
82 | flags = MAP_ANON | MAP_SHARED; | |
83 | #else // Use "/dev/zero" | |
84 | fd = open("/dev/zero", O_RDWR); | |
85 | flags = MAP_SHARED; | |
86 | if(fd == -1){ | |
87 | error_info err = system_error_code(); | |
88 | throw interprocess_exception(err); | |
89 | } | |
90 | #endif | |
91 | ||
92 | ||
93 | address = mmap( address | |
94 | , size | |
95 | , PROT_READ|PROT_WRITE | |
96 | , flags | |
97 | , fd | |
98 | , 0); | |
99 | ||
100 | if(address == MAP_FAILED){ | |
101 | if(fd != -1) | |
102 | close(fd); | |
103 | error_info err = system_error_code(); | |
104 | throw interprocess_exception(err); | |
105 | } | |
106 | ||
107 | if(fd != -1) | |
108 | close(fd); | |
109 | ||
110 | return ipcdetail::raw_mapped_region_creator::create_posix_mapped_region(address, size); | |
111 | } | |
112 | #else | |
113 | { | |
114 | windows_shared_memory anonymous_mapping(create_only, 0, read_write, size); | |
115 | return mapped_region(anonymous_mapping, read_write, 0, size, address); | |
116 | } | |
117 | ||
118 | #endif | |
119 | ||
120 | } //namespace interprocess { | |
121 | } //namespace boost { | |
122 | ||
123 | #include <boost/interprocess/detail/config_end.hpp> | |
124 | ||
125 | #endif //BOOST_INTERPROCESS_ANONYMOUS_SHARED_MEMORY_HPP |