--- freem/src/service.c	2025/04/09 19:52:02	1.13
+++ freem/src/service.c	2026/01/07 19:51:33	1.14
@@ -1,5 +1,5 @@
 /*
- *   $Id: service.c,v 1.13 2025/04/09 19:52:02 snw Exp $
+ *   $Id: service.c,v 1.14 2026/01/07 19:51:33 snw Exp $
  *    terminal and sequential I/O handling,
  *    file and global locking
  *
@@ -25,6 +25,9 @@
  *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
  *
  *   $Log: service.c,v $
+ *   Revision 1.14  2026/01/07 19:51:33  snw
+ *   Fix segfault in reverse $QUERY
+ *
  *   Revision 1.13  2025/04/09 19:52:02  snw
  *   Eliminate as many warnings as possible while building with -Wall
  *
@@ -68,6 +71,7 @@
 
 #define MAXZAS NESTLEVLS
 #include "mpsdef.h"
+#include "shmmgr.h"
 
 #include <time.h>
 
@@ -94,10 +98,9 @@ int scosgr (short att, short bwflag);
 #  endif
 #  define termio termios
 # else
-#  if !defined(MSDOS)
+#  if !defined(MSDOS) && !defined(__linux__)
 #    include <termio.h>
-#  endif
-#  if defined(__OS2__)
+#  else
 #    include <termios.h>
 #    define termio termios
 #  endif
@@ -106,6 +109,7 @@ int scosgr (short att, short bwflag);
 # include <termios.h>
 #endif
 
+
 #include <fcntl.h>
 
 /* search 'string' for occurence of 'pattrn'
@@ -4341,6 +4345,11 @@ int locking (int fd, int action, long co
 
     struct flock lock;
 
+    /* skip locking if we own the TP semaphore */
+    if (shm_config->hdr->tp_owner == pid) {
+        return 0;
+    }
+    
     lock.l_whence = 1;			/* lock from current position */
     lock.l_start = 0;
     lock.l_len = count;