--- freem/src/shmmgr.h	2025/05/08 16:29:18	1.5
+++ freem/src/shmmgr.h	2025/05/09 19:44:50	1.6
@@ -1,5 +1,5 @@
 /*
- *   $Id: shmmgr.h,v 1.5 2025/05/08 16:29:18 snw Exp $
+ *   $Id: shmmgr.h,v 1.6 2025/05/09 19:44:50 snw Exp $
  *    shared memory manager data structures
  *
  *  
@@ -24,6 +24,9 @@
  *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
  *
  *   $Log: shmmgr.h,v $
+ *   Revision 1.6  2025/05/09 19:44:50  snw
+ *   Begin shm rework
+ *
  *   Revision 1.5  2025/05/08 16:29:18  snw
  *   Add SOM/SOA/SBM/SBA macros from RSM and modify for FreeM
  *
@@ -75,6 +78,8 @@
 /* The following macros were borrowed from Reference Standard M
  *  SOM/SOA:  reading and writing data stored in shared memory
  *  SBM/SBA:  for modifying pointers in shared memory
+ *
+ *  Versions ending with 'A' will maintain NULL pointers.
  */
 #define SOM(ptr)    ((__typeof__(ptr)) ((char *) (ptr) + ((char *) shm_config->dta - (char *) shm_config->hdr->shmad)))
 #define SOA(ptr)    ((ptr == NULL) ? NULL : SOM(ptr))