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