--- src/sys/sys/unistd.h	2005/12/03 02:19:52	1.5
+++ src/sys/sys/unistd.h	2006/10/10 15:40:47	1.6
@@ -32,7 +32,7 @@
  *
  *	@(#)unistd.h	8.2 (Berkeley) 1/7/94
  * $FreeBSD: src/sys/sys/unistd.h,v 1.22.2.2 2000/08/22 01:46:30 jhb Exp $
- * $DragonFly: src/sys/sys/unistd.h,v 1.4 2004/11/09 17:52:45 joerg Exp $
+ * $DragonFly$
  */
 
 #ifndef _SYS_UNISTD_H_
@@ -219,8 +219,9 @@
 #define RFTHREAD	(1<<13)	/* enable kernel thread support */
 #define RFSIGSHARE	(1<<14)	/* share signal handlers */
 #define RFLINUXTHPN     (1<<16) /* do linux clone exit parent notification */
+#define RFPGLOCK	(1<<30) /* process group interlock for signal race */
 #define RFPPWAIT	(1<<31) /* parent sleeps until child exits (vfork) */
-#define RFKERNELONLY	RFPPWAIT
+#define RFKERNELONLY	(RFPPWAIT|RFPGLOCK)
 
 
 #endif /* !_POSIX_SOURCE */