Make the documentation match reality. If no explicit kernel name is

provided, kvm_open() and kvm_openfiles() will try _PATH_KSYMS first,
then either the path from sysctl machdep.booted_kernel (if that's
available) or _PATH_UNIX (if the sysctl is not available).

lib/libkvm/kvm_open.3

@@ -1,4 +1,4 @@
-.\"	$NetBSD: kvm_open.3,v 1.15 2009/03/10 23:49:07 joerg Exp $
+.\"	$NetBSD: kvm_open.3,v 1.16 2009/09/14 19:34:12 apb Exp $
 .\"
 .\" Copyright (c) 1992, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -33,7 +33,7 @@
 .\"
 .\"     @(#)kvm_open.3	8.3 (Berkeley) 4/19/94
 .\"
-.Dd April 19, 1994
+.Dd September 14, 2009
 .Dt KVM_OPEN 3
 .Os
 .Sh NAME
@@ -69,8 +69,19 @@ is the executable image of the kernel being examined.
 This file must contain a symbol table.
 If this argument is
 .Dv NULL ,
-the currently running system is assumed,
-which is indicated by
+the currently running system is assumed; in this case, the functions will
+attempt to use the
+.Xr ksyms 4
+device indicated by
+.Dv _PATH_KSYMS
+in
+.Aq Pa paths.h ;
+if that fails, then they will use the file indicated by the
+.Xr sysctl 3
+variable
+.Va machdep.booted_kernel ,
+or (if the sysctl information is not available)
+the default kernel path indicated by
 .Dv _PATH_UNIX
 in
 .Aq Pa paths.h .