--- freem/src/shmmgr.c	2025/04/15 19:26:13	1.10
+++ freem/src/shmmgr.c	2025/04/15 21:57:10	1.12
@@ -1,5 +1,5 @@
 /*
- *   $Id: shmmgr.c,v 1.10 2025/04/15 19:26:13 snw Exp $
+ *   $Id: shmmgr.c,v 1.12 2025/04/15 21:57:10 snw Exp $
  *    shared memory manager
  *
  *  
@@ -24,6 +24,12 @@
  *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
  *
  *   $Log: shmmgr.c,v $
+ *   Revision 1.12  2025/04/15 21:57:10  snw
+ *   Fix SysV IPC bugs on FreeBSD
+ *
+ *   Revision 1.11  2025/04/15 21:08:51  snw
+ *   Add some useful debug output
+ *
  *   Revision 1.10  2025/04/15 19:26:13  snw
  *   Remove extra whitespace
  *
@@ -87,6 +93,12 @@ void shm_daemon_init(void);
 
 shm_config_t *shm_config = (shm_config_t *) NULL;
 
+#if defined(__FreeBSD__)
+# define FM_SHM_PERMS 0660
+#else
+# define FM_SHM_PERMS 0770
+#endif
+
 short shm_init(const size_t seg_size)
 {
     size_t alloc_map_size;
@@ -108,8 +120,8 @@ short shm_init(const size_t seg_size)
     shm_config->segsiz = seg_size + alloc_map_size + pg_size;
     shm_config->key = ftok (config_file, 1);
     shm_config->pgsiz = pg_size;
-    
-    shm_config->seg_id = shmget (shm_config->key, shm_config->segsiz, 0770 | IPC_CREAT);
+       
+    shm_config->seg_id = shmget (shm_config->key, shm_config->segsiz, FM_SHM_PERMS | IPC_CREAT);
     if (shm_config->seg_id == -1) {
         if (errno == 22) {
             logprintf (FM_LOG_ERROR, "shm_init:  cannot get shared memory segment of %ld bytes", (unsigned long) shm_config->segsiz);
@@ -172,17 +184,15 @@ short shm_init(const size_t seg_size)
                 /* grab the pointers we need */
                 void *old_addr = shm_config->dta;
                 void *new_addr = shm_config->hdr->shmad;
+
+                logprintf (FM_LOG_INFO, "shmmgr:  remapping shared memory from virtual address %p to %p", old_addr, new_addr);
                 
                 /* detach and reattach */
                 if (shmdt (old_addr) == -1) {
                     logprintf (FM_LOG_FATAL, "shm_init:  detach failed during detach/reattach [shmdt error %s]", strerror (errno));
                 }
 
-#if defined(__FreeBSD__)
-                shm_config->dta = shmat (shm_config->seg_id, new_addr, SHM_REMAP);
-#else                
                 shm_config->dta = shmat (shm_config->seg_id, new_addr, 0);
-#endif
 
                 if (shm_config->dta == (void *) -1) {
                     logprintf (FM_LOG_FATAL, "shm_init:  fatal error attaching shared memory segment [shmat error '%s']", strerror (errno));