introduce /etc/sysctl.conf containing sysctl variables to change at boot time

src/etc/rc

@@ -1,4 +1,4 @@
-#	$OpenBSD: rc,v 1.60 1998/01/23 08:38:31 art Exp $
+#	$OpenBSD: rc,v 1.61 1998/02/05 09:54:36 deraadt Exp $
 
 # System startup script run by init on autoboot
 # or after single-user.
@@ -113,10 +113,6 @@ if [ X"${ipfilter}" = X"YES" -a X"${ipmon_flags}" != X"NO" ]; then
 	echo 'starting ipmon';		ipmon ${ipmon_flags}
 fi
 
-if [ X"${rfc1323}" = X"NO" ]; then
-	echo 'disabling rfc1323'; 	sysctl -w net.inet.tcp.rfc1323=0
-fi
-
 # $photurisd_flags is imported from /etc/rc.conf;
 # If $photurisd_flags == NO or /etc/photuris/photuris.conf doesn't exist, then
 # photurisd isn't run.
@@ -230,6 +226,16 @@ echo clearing /tmp
     find . ! -name . ! -name lost+found ! -name quota.user \
 	! -name quota.group -exec rm -rf -- {} \; -type d -prune)
 
+if [ -f /etc/sysctl.conf ]; then
+	# delete comments and blank lines
+	set -- `sed -e 's/#.*$//' /etc/sysctl.conf | grep -v '^$'`
+	while [ $# -ge 1 ] ; do
+		sysctl -w $1
+		shift 1
+	done
+)	
+fi
+
 test -f /etc/rc.securelevel && . /etc/rc.securelevel
 if [ X${securelevel} != X"" ]; then
 	echo -n 'setting kernel security level: '

src/etc/rc.conf

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: rc.conf,v 1.9 1998/01/21 23:35:57 downsj Exp $
+#	$OpenBSD: rc.conf,v 1.10 1998/02/05 09:54:37 deraadt Exp $
 
 # set these to "NO" to turn them off.  otherwise, they're used as flags
 routed_flags=NO		# for 'normal' use: routed_flags="-q"
@@ -28,7 +28,6 @@ portmap=YES			# almost always needed
 inetd=YES			# almost always needed
 lpd=NO				# printing daemons
 check_quotas=YES		# NO may be desireable in some YP environments
-rfc1323=YES			# TCP RFC1323 extensions (disable if tcp is slow)
 ipforward=NO			# route packets between interfaces
 
 # miscellaneous other flags

src/etc/sysctl.conf

@@ -0,0 +1,6 @@
+#	$OpenBSD: sysctl.conf,v 1.1 1998/02/05 09:54:37 deraadt Exp $
+# This files contains a list of sysctl options the user wants set at
+# boot time.
+# ie.
+#net.inet.tcp.rfc1323=0			# TCP RFC1323 extensions (disable if tcp is slow)
+#ddb.panic_ddb=0			# Do not drop into ddb on a kernel panic