102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
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//////////////////////////////////////////////////////////////////////////////
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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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