IOAccess.h

См. документацию.

/* This file is part of the UniSet project
 * Copyright (c) 2002 Free Software Foundation, Inc.
 * Copyright (c) 2002 Vitaly Lipatov
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
// --------------------------------------------------------------------------
// --------------------------------------------------------------------------
#ifndef _IOACCESS_H_
#define _IOACCESS_H_
// --------------------------------------------------------------------------
#include <unistd.h>
#include <fcntl.h>
#include <iostream>

#include "Exceptions.h"

class IOAccess
{
public:

    IOAccess()
    {
        fd_port = open("/dev/port", O_RDWR | O_NDELAY);
        if ( fd_port == -1 )
            throw UniSetTypes::IOBadParam();
    }
    
    ~IOAccess()
    {
        close(fd_port);
    }
    
    void get(int port, void* buf, int size) const
    {
        if ( lseek(fd_port, port, SEEK_SET) == -1 )
            throw UniSetTypes::IOBadParam();
        ssize_t s = read(fd_port, buf, size);
        if ( s != size )
            throw UniSetTypes::IOBadParam();
    }
    
    int in(int port) const
    {
        char input;
        get(port, &input, 1);
        return input;
    }
    
    void put(int port, const void* buf, int size) const
    {
        if ( lseek(fd_port, port, SEEK_SET) == -1 )
            throw UniSetTypes::IOBadParam();
        ssize_t s = write(fd_port, buf, size);
        if ( s != size )
            throw UniSetTypes::IOBadParam();
    }

    void out(int port, int value) const
    {
        char output = value;
        put(port,&output,1);
    }

private:

    int fd_port;
    
};

#endif