[src/trunk]: src/etc Clear rc variables that contain state that is gone after...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e74b1183da29
branches:  trunk
changeset: 822476:e74b1183da29
user:      christos <christos%NetBSD.org@localhost>
date:      Tue Mar 21 22:52:10 2017 +0000

description:
Clear rc variables that contain state that is gone after the boot process
is complete, so that scripts invoked from powerd don't think that they
are still invoked by the rc system and fail.
Reported by rudolf @ tech-userlevel

diffstat:

 etc/rc.subr |  15 ++++++++++++---
 1 files changed, 12 insertions(+), 3 deletions(-)

diffs (42 lines):

diff -r 632db3bb5e1e -r e74b1183da29 etc/rc.subr
--- a/etc/rc.subr       Tue Mar 21 21:42:18 2017 +0000
+++ b/etc/rc.subr       Tue Mar 21 22:52:10 2017 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: rc.subr,v 1.98 2016/03/06 18:49:42 christos Exp $
+# $NetBSD: rc.subr,v 1.99 2017/03/21 22:52:10 christos Exp $
 #
 # Copyright (c) 1997-2011 The NetBSD Foundation, Inc.
 # All rights reserved.
@@ -36,6 +36,15 @@
 nl='
 ' # a literal newline
 
+# RC variables to clear on start.
+_env_clear_rc_vars="
+RC_PID=
+_rc_pid=
+_rc_original_stdout_fd=
+_rc_original_stderr_fd=
+_rc_postprocessor_fd=
+"
+
 #
 #      functions
 #      ---------
@@ -665,14 +674,14 @@
                        echo "Starting ${name}."
                        if [ -n "$_chroot" ]; then
                                _doit="\
-${_env:+env $_env }\
+env $_env_clear_rc_vars $_env \
 ${_nice:+nice -n $_nice }\
 chroot ${_user:+-u $_user }${_group:+-g $_group }${_groups:+-G $_groups }\
 $_chroot $command $rc_flags $command_args"
                        else
                                _doit="\
 ${_chdir:+cd $_chdir; }\
-${_env:+env $_env }\
+env $_env_clear_rc_vars $_env \
 ${_nice:+nice -n $_nice }\
 $command $rc_flags $command_args"
                                if [ -n "$_user" ]; then