FileDescriptor.h

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/*
 * Copyright (C) 2015 Niek Linnenbank
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef __LIB_LIBFS_FILEDESCRIPTOR_H
#define __LIB_LIBFS_FILEDESCRIPTOR_H
 
#include <Types.h>
#include <Singleton.h>
#include "FileSystemPath.h"
 
class FileDescriptor : public StrictSingleton<FileDescriptor>
{
  public:
 
    static const Size MaximumFiles = 1024;
 
    struct Entry
    {
        u32 inode;     
        ProcessID pid; 
        Size position; 
        bool open;     
    };
 
    enum Result
    {
        Success,
        InvalidArgument,
        OutOfFiles
    };
 
  public:
 
    FileDescriptor();
 
    Entry * getArray(Size & count);
 
    void setArray(Entry *array,
                  const Size count);
 
    Result openEntry(const u32 inode,
                     const ProcessID filesystem,
                     Size & index);
 
    Entry * getEntry(const Size index);
 
    Result closeEntry(const Size index);
 
  private:
 
    Entry *m_array;
 
    Size m_count;
};
 
#endif /* __LIB_LIBFS_FILEDESCRIPTOR_H */