o Export the nextpid variable via SYSCTL as kern.lastpid, decreasing by

one the number of variables needed for top and other setgid kmem
  utilities that could only be accessed via /dev/kmem previously.

Submitted by:	Thomas Moestl <tmoestl@gmx.net>
Reviewed by:	freebsd-audit

sys/kern/kern_fork.c

@@ -148,6 +148,8 @@ rfork(p, uap)
 
 int	nprocs = 1;				/* process 0 */
 static int nextpid = 0;
+SYSCTL_INT(_kern, OID_AUTO, lastpid, CTLFLAG_RD, &nextpid, 0, 
+    "Last used PID");
 
 /*
  * Random component to nextpid generation.  We mix in a random factor to make