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Annotation of freem/src/global_bltin.h, revision 1.11

1.1       snw         1: /*
1.11    ! snw         2:  *   $Id: global_bltin.h,v 1.10 2025/04/11 00:52:40 snw Exp $
1.1       snw         3:  *    built-in global handler header
                      4:  *
                      5:  *  
1.2       snw         6:  *   Author: Serena Willis <snw@coherent-logic.com>
1.1       snw         7:  *    Copyright (C) 1998 MUG Deutschland
1.3       snw         8:  *    Copyright (C) 2020, 2025 Coherent Logic Development LLC
1.1       snw         9:  *
                     10:  *
                     11:  *   This file is part of FreeM.
                     12:  *
                     13:  *   FreeM is free software: you can redistribute it and/or modify
                     14:  *   it under the terms of the GNU Affero Public License as published by
                     15:  *   the Free Software Foundation, either version 3 of the License, or
                     16:  *   (at your option) any later version.
                     17:  *
                     18:  *   FreeM is distributed in the hope that it will be useful,
                     19:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
                     20:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     21:  *   GNU Affero Public License for more details.
                     22:  *
                     23:  *   You should have received a copy of the GNU Affero Public License
                     24:  *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
                     25:  *
1.4       snw        26:  *   $Log: global_bltin.h,v $
1.11    ! snw        27:  *   Revision 1.10  2025/04/11 00:52:40  snw
        !            28:  *   Replace all lseek/read calls in global handler to use gbl_read_block function
        !            29:  *
1.10      snw        30:  *   Revision 1.9  2025/04/09 14:34:30  snw
                     31:  *   Further work on global_bltin.c refactor
                     32:  *
1.9       snw        33:  *   Revision 1.8  2025/04/09 00:43:07  snw
                     34:  *   Exit with fatal error if a header mismatch found
                     35:  *
1.8       snw        36:  *   Revision 1.7  2025/04/08 21:41:13  snw
                     37:  *   Make insert, update, and splitp global handler functions take a ptr to a global_handle instead of a file descriptor
                     38:  *
1.7       snw        39:  *   Revision 1.6  2025/04/08 20:00:56  snw
                     40:  *   Global handler now uses a header file and maintains the last journaling transaction ID
                     41:  *
1.6       snw        42:  *   Revision 1.5  2025/04/08 16:46:11  snw
                     43:  *   Add global file header and offsets
                     44:  *
1.5       snw        45:  *   Revision 1.4  2025/04/08 14:39:21  snw
                     46:  *   Initial work on global handler refactor
                     47:  *
1.4       snw        48:  *   Revision 1.3  2025/03/09 19:14:25  snw
                     49:  *   First phase of REUSE compliance and header reformat
                     50:  *
1.3       snw        51:  *
                     52:  * SPDX-FileCopyrightText:  (C) 2025 Coherent Logic Development LLC
                     53:  * SPDX-License-Identifier: AGPL-3.0-or-later
1.1       snw        54:  **/
1.4       snw        55: 
                     56: #if !defined(__FREEM_GLOBAL_BLTIN_H)
                     57: # define __FREEM_GLOBAL_BLTIN_H
                     58: 
1.5       snw        59: #include "version.h"
                     60: 
                     61: #define GBL_FORMAT_VERSION 2
                     62: #define GBL_MAGIC "FRMGL"
                     63: 
1.6       snw        64: #define GBL_HDR_OK 0
                     65: #define GBL_HDR_NOTOPEN 1
                     66: #define GBL_HDR_BADMAGIC 2
                     67: #define GBL_HDR_BADVERSION 3
                     68: #define GBL_HDR_BADBLOCKSIZE 4
                     69: 
1.5       snw        70: typedef struct global_header {
                     71:     
                     72:     char magic[5]; /* FRMGL */
                     73:     int format_version;
                     74:     char host_triplet[40];
1.8       snw        75:     char host_id[256];
                     76:     
1.5       snw        77:     unsigned long block_size;
                     78:     unsigned long last_transaction_id;
                     79: 
                     80:     long created;
                     81:     long last_backup;
                     82:     
                     83: } global_header;
                     84: 
1.4       snw        85: typedef struct global_handle {
                     86: 
                     87:     int fd; /* file descriptor */
1.5       snw        88: 
                     89:     global_header header;
1.9       snw        90:    
1.4       snw        91:     long age;
                     92:     short opened;
                     93:     short locked;
                     94:     unsigned long last_block;
1.5       snw        95:     
1.9       snw        96:     unsigned long use_count; /* how many times has it been accessed? */
1.10      snw        97:     unsigned long read_ops;
                     98:     unsigned long write_ops;
                     99:     unsigned long splits;    
1.9       snw       100:     unsigned long cache_misses;
                    101:     unsigned long cache_hits;
                    102:     
1.4       snw       103:     short fast_path;
                    104:     
                    105:     char global_name[256];
                    106:     char global_path[4096];
                    107: 
                    108:     
                    109:     struct global_handle *next;   
                    110:     
                    111: } global_handle;
                    112: 
                    113: extern global_handle *global_handles_head;
1.9       snw       114: extern unsigned long gbl_cache_misses;
                    115: extern unsigned long gbl_cache_hits;
1.7       snw       116: 
                    117: extern inline long gbl_path(char *key, char *buf);
1.9       snw       118: extern void gbl_cache_hit(global_handle *g);
                    119: extern void gbl_cache_miss(global_handle *g);
1.7       snw       120: extern int gbl_lock(global_handle *g, int type);
                    121: extern int gbl_unlock(global_handle *g);
                    122: extern void gbl_close(global_handle *g);
                    123: extern void gbl_close_all(void);
                    124: extern int gbl_write_initial_header(global_handle *g);
                    125: extern int gbl_write_header(global_handle *g, global_header *hdr);
                    126: extern int gbl_read_header(global_handle *g, global_header *h);
                    127: extern int gbl_update_tid(global_handle *g);
                    128: extern int gbl_create(global_handle *g);
                    129: extern short gbl_open(global_handle *g, short action);
1.10      snw       130: extern int gbl_read_block(global_handle *g, unsigned long blocknum, char *block);
1.11    ! snw       131: extern int gbl_write_block(global_handle *g, unsigned long blocknum, char *block);
1.7       snw       132: extern global_handle *gbl_handle(char *key);
                    133: 
1.4       snw       134: #endif