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Add global file header and offsets

/*
 *   $Id: global_bltin.h,v 1.5 2025/04/08 16:46:11 snw Exp $
 *    built-in global handler header
 *
 *  
 *   Author: Serena Willis <snw@coherent-logic.com>
 *    Copyright (C) 1998 MUG Deutschland
 *    Copyright (C) 2020, 2025 Coherent Logic Development LLC
 *
 *
 *   This file is part of FreeM.
 *
 *   FreeM is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Affero Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   FreeM 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 Affero Public License for more details.
 *
 *   You should have received a copy of the GNU Affero Public License
 *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
 *
 *   $Log: global_bltin.h,v $
 *   Revision 1.5  2025/04/08 16:46:11  snw
 *   Add global file header and offsets
 *
 *   Revision 1.4  2025/04/08 14:39:21  snw
 *   Initial work on global handler refactor
 *
 *   Revision 1.3  2025/03/09 19:14:25  snw
 *   First phase of REUSE compliance and header reformat
 *
 *
 * SPDX-FileCopyrightText:  (C) 2025 Coherent Logic Development LLC
 * SPDX-License-Identifier: AGPL-3.0-or-later
 **/

#if !defined(__FREEM_GLOBAL_BLTIN_H)
# define __FREEM_GLOBAL_BLTIN_H

#include "version.h"

#define GBL_FORMAT_VERSION 2
#define GBL_MAGIC "FRMGL"

typedef struct global_header {
    
    char magic[5]; /* FRMGL */
    int format_version;
    char host_triplet[40];

    unsigned long block_size;
    unsigned long last_transaction_id;

    long created;
    long last_backup;
    
} global_header;

typedef struct global_handle {

    int fd; /* file descriptor */

    global_header header;
    long use_count; /* how many times has it been accessed? */
    long age;
    short opened;
    short locked;
    unsigned long last_block;
    
    short fast_path;
    
    char global_name[256];
    char global_path[4096];

    
    struct global_handle *next;   
    
} global_handle;

extern global_handle *global_handles_head;

#endif