--- freem/src/shmmgr.h	2025/03/26 15:17:12	1.4
+++ freem/src/shmmgr.h	2025/05/15 04:14:20	1.7
@@ -1,5 +1,5 @@
 /*
- *   $Id: shmmgr.h,v 1.4 2025/03/26 15:17:12 snw Exp $
+ *   $Id: shmmgr.h,v 1.7 2025/05/15 04:14:20 snw Exp $
  *    shared memory manager data structures
  *
  *  
@@ -24,6 +24,15 @@
  *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
  *
  *   $Log: shmmgr.h,v $
+ *   Revision 1.7  2025/05/15 04:14:20  snw
+ *   Remove old SEMK_ macros since ftok is now used throughout to determine semaphore keys
+ *
+ *   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
+ *
  *   Revision 1.4  2025/03/26 15:17:12  snw
  *   Fall back to global-backed SSVNs when memory-backed globals fail in attempt to fix Tru64
  *
@@ -62,13 +71,19 @@
 #define SHMS_GET_ERR 0
 #define SHMS_ATTACH_ERR -1
 
-#define SEMK_SHM 0xBBDD21
-#define SEMK_LOCKTAB 0xBBDD22
-#define SEMK_JOBTAB 0xBBDD23
-#define SEMK_TP 0xBBDD24
-
 #define SHMALIGN(a) (void *) (((unsigned long) a + sysconf (_SC_PAGESIZE)) & ~(sysconf (_SC_PAGESIZE) - 1))
 
+/* 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))
+#define SBM(ptr)    ((__typeof__(ptr)) ((char *) (ptr) - ((char *) shm_config->dta - (char *) shm_config->hdr->shmad)))
+#define SBA(ptr)    ((ptr == NULL) ? NULL : SBM(ptr))
+
 /* data structures */
 
 /* alloc map entry */