From c84f8c0e1788e3d4765e26f4bc1ac55a7a0fb5b2 Mon Sep 17 00:00:00 2001
From: Doug Barton <dougb@FreeBSD.org>
Date: Sun, 17 Mar 2002 20:14:11 +0000
Subject: [PATCH] Distinguish between first and last passes of rc.sysctl, and
 only set mibs whose values are not already what is specified in sysctl.conf.

---
 etc/rc          |  5 ++---
 etc/rc.d/sysctl | 18 +++++++++++++++++-
 etc/rc.sysctl   | 18 +++++++++++++++++-
 3 files changed, 36 insertions(+), 5 deletions(-)

diff --git a/etc/rc b/etc/rc
index db41a8a9fa2c..763ce47d3441 100644
--- a/etc/rc
+++ b/etc/rc
@@ -404,8 +404,7 @@ esac
 # Early pass to set the variables we can
 #
 if [ -r /etc/rc.sysctl ]; then
-	echo 'Warnings here may be due to modules that have not been loaded yet'
-	. /etc/rc.sysctl
+	. /etc/rc.sysctl first
 fi
 
 # Configure serial devices
@@ -918,7 +917,7 @@ fi
 # Late pass to set variables we missed the first time
 #
 if [ -r /etc/rc.sysctl ]; then
-	. /etc/rc.sysctl
+	. /etc/rc.sysctl last
 fi
 
 # Raise kernel security level.  This should be done only after `fsck' has
diff --git a/etc/rc.d/sysctl b/etc/rc.d/sysctl
index bedddb636697..1e315f2eb239 100644
--- a/etc/rc.d/sysctl
+++ b/etc/rc.d/sysctl
@@ -38,7 +38,23 @@ if [ -f /etc/sysctl.conf ]; then
 		\#*|'')
 			;;
 		*)
-			sysctl ${var}
+			mib=${var%=*}
+			val=${var#*=}
+
+			if current_value=`sysctl -n ${mib} 2>/dev/null`; then
+				case ${current_value} in
+				${val}) ;;
+				*)
+					sysctl ${var}
+					;;
+				esac
+			else
+				case ${1} in
+				last)
+				echo "Warning: sysctl ${mib} does not exist"
+					;;
+				esac
+			fi
 			;;
 		esac
 	done < /etc/sysctl.conf
diff --git a/etc/rc.sysctl b/etc/rc.sysctl
index bedddb636697..1e315f2eb239 100644
--- a/etc/rc.sysctl
+++ b/etc/rc.sysctl
@@ -38,7 +38,23 @@ if [ -f /etc/sysctl.conf ]; then
 		\#*|'')
 			;;
 		*)
-			sysctl ${var}
+			mib=${var%=*}
+			val=${var#*=}
+
+			if current_value=`sysctl -n ${mib} 2>/dev/null`; then
+				case ${current_value} in
+				${val}) ;;
+				*)
+					sysctl ${var}
+					;;
+				esac
+			else
+				case ${1} in
+				last)
+				echo "Warning: sysctl ${mib} does not exist"
+					;;
+				esac
+			fi
 			;;
 		esac
 	done < /etc/sysctl.conf