MapFile.hpp

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// DUNE DAQ modification notice:
// This file has been modified from the original ATLAS system source for the DUNE DAQ project.
// Fork baseline commit: system-00-00-20 (2020-09-25).
// Renamed since fork: yes (from system/MapFile.h to include/okssystem/MapFile.hpp).
 
/*
 *  MapFile.h
 *  OksSystem
 *
 *  Created by Matthias Wiesmann on 07.01.05.
 *  Copyright 2005 CERN. All rights reserved.
 *
 */
 
#ifndef OKSSYSTEM_MAP_FILE
#define OKSSYSTEM_MAP_FILE
 
#include "okssystem/File.hpp"
 
namespace OksSystem {
    
    class Descriptor ; 
    
    
    class MapFile : public File {
 
    public:
 
      MapFile(const std::string &file, size_t size, size_t offset, bool read_mode, bool write_mode, mode_t permissions = 0666) ;
      ~MapFile(); 
      
      void zero() const ;                      
      void map();                              
      void unmap();                            
      bool is_mapped() const;                  
      bool is_loaded() const throw() ;         
      void *address() const throw() ;          
      size_t memory_size() const throw() ;     
      OksSystem::Descriptor* fd() const throw() ; 
      
    protected:
 
      void    open_fd();           
      void    close_fd();          
      void    map_mem();           
      void    unmap_mem();         
 
      void *  m_map_address ;      
      size_t  m_map_size ;         
      size_t  m_map_offset ;       
      Descriptor *m_map_descriptor ;
      mode_t  m_map_permission ;   
      bool    m_map_read ;         
      bool    m_map_write ;        
      bool    m_is_mapped ;        
 
    private:
 
      static const char* const MAP_LOAD_MSG ;       
      static const char* const MAP_NOT_LOAD_MSG ;   
      static const char* const PAGE_SIZE_MSG ;      
      static const char* const READ_OR_WRITE_MSG ;  
      static const char* const MAP_NOT_WRITE_MSG ;  
 
    } ; // MapFile
    
} // ers
 
#endif