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101 lines
2.8 KiB
101 lines
2.8 KiB
////////////////////////////////////////////////////////////////////////////// |
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// |
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// (C) Copyright Ion Gaztanaga 2009. Distributed under the Boost |
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// Software License, Version 1.0. (See accompanying file |
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// See http://www.boost.org/libs/interprocess for documentation. |
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// |
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////////////////////////////////////////////////////////////////////////////// |
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#ifndef BOOST_INTERPROCESS_XSI_KEY_HPP |
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#define BOOST_INTERPROCESS_XSI_KEY_HPP |
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#ifndef BOOST_CONFIG_HPP |
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# include <boost/config.hpp> |
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#endif |
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# |
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#if defined(BOOST_HAS_PRAGMA_ONCE) |
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# pragma once |
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#endif |
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#include <boost/interprocess/detail/config_begin.hpp> |
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#include <boost/interprocess/detail/workaround.hpp> |
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#include <boost/detail/workaround.hpp> |
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#if !defined(BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS) |
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#error "This header can't be used in operating systems without XSI (System V) shared memory support" |
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#endif |
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#include <boost/interprocess/creation_tags.hpp> |
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#include <boost/interprocess/exceptions.hpp> |
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#include <boost/interprocess/detail/utilities.hpp> |
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#include <boost/move/utility_core.hpp> |
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#include <boost/interprocess/detail/os_file_functions.hpp> |
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#include <boost/interprocess/interprocess_fwd.hpp> |
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#include <boost/interprocess/exceptions.hpp> |
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#include <sys/types.h> |
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#include <sys/ipc.h> |
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#include <cstddef> |
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#include <boost/cstdint.hpp> |
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//!\file |
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//!Describes a class representing a xsi key type. |
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namespace boost { |
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namespace interprocess { |
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//!A class that wraps XSI (System V) key_t type. |
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//!This type calculates key_t from path and id using ftok, |
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//!sets key to a specified value, |
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//!or sets key to IPC_PRIVATE using the default constructor. |
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class xsi_key |
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{ |
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public: |
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//!Default constructor. |
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//!Represents a private xsi_key. |
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xsi_key() |
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: m_key(IPC_PRIVATE) |
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{} |
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//!Creates a new XSI key using a specified value. Constructor is explicit to avoid ambiguity with shmid. |
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explicit xsi_key(key_t key) |
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: m_key(key) |
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{} |
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//!Creates a new XSI shared memory with a key obtained from a call to ftok (with path |
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//!"path" and id "id"), of size "size" and permissions "perm". |
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//!If the shared memory previously exists, throws an error. |
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xsi_key(const char *path, boost::uint8_t id) |
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{ |
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key_t key; |
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if(path){ |
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key = ::ftok(path, id); |
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if(((key_t)-1) == key){ |
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error_info err = system_error_code(); |
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throw interprocess_exception(err); |
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} |
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} |
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else{ |
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key = IPC_PRIVATE; |
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} |
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m_key = key; |
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} |
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//!Returns the internal key_t value |
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key_t get_key() const |
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{ return m_key; } |
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED) |
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private: |
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key_t m_key; |
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED |
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}; |
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} //namespace interprocess { |
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} //namespace boost { |
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#include <boost/interprocess/detail/config_end.hpp> |
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#endif //BOOST_INTERPROCESS_XSI_KEY_HPP
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