--- freem/src/global_bltin.h	2025/04/08 14:39:21	1.4
+++ freem/src/global_bltin.h	2025/04/08 16:46:11	1.5
@@ -1,5 +1,5 @@
 /*
- *   $Id: global_bltin.h,v 1.4 2025/04/08 14:39:21 snw Exp $
+ *   $Id: global_bltin.h,v 1.5 2025/04/08 16:46:11 snw Exp $
  *    built-in global handler header
  *
  *  
@@ -24,6 +24,9 @@
  *   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
  *
@@ -38,15 +41,36 @@
 #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];