[src/trunk]: src/etc PR misc/50046

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

details:   https://anonhg.NetBSD.org/src/rev/219d622dca59
branches:  trunk
changeset: 341338:219d622dca59
user:      phx <phx%NetBSD.org@localhost>
date:      Sat Oct 31 12:31:37 2015 +0000

description:
PR misc/50046
Remove the expensive tests in _have_rc_postprocessor(), as proposed by apb@.
It more than halves the multiuser boot time on slow machines and brings
it back near to the previous level.

diffstat:

 etc/rc.subr |  18 ++++--------------
 1 files changed, 4 insertions(+), 14 deletions(-)

diffs (32 lines):

diff -r af3c2c948b88 -r 219d622dca59 etc/rc.subr
--- a/etc/rc.subr       Sat Oct 31 09:14:27 2015 +0000
+++ b/etc/rc.subr       Sat Oct 31 12:31:37 2015 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: rc.subr,v 1.96 2014/10/07 19:09:45 roy Exp $
+# $NetBSD: rc.subr,v 1.97 2015/10/31 12:31:37 phx Exp $
 #
 # Copyright (c) 1997-2011 The NetBSD Foundation, Inc.
 # All rights reserved.
@@ -814,19 +814,9 @@
 _have_rc_postprocessor()
 {
        # Cheap tests that fd and pid are set, fd is writable.
-       [ -n "${_rc_postprocessor_fd}" ] || return 1
-       [ -n "${_rc_pid}" ] || return 1
-       eval ": >&${_rc_postprocessor_fd}" 2>/dev/null || return 1
-
-       # More expensive test that pid is running.
-       # Unset _rc_pid if this fails.
-       kill -0 "${_rc_pid}" 2>/dev/null \
-       || { unset _rc_pid; return 1; }
-
-       # More expensive test that pid appears to be
-       # a shell running an rc script.
-       # Unset _rc_pid if this fails.
-       expr "$(ps -p "${_rc_pid}" -o command=)" : ".*sh .*/rc.*" >/dev/null \
+       [ -n "${_rc_pid}" ] || { unset _rc_pid; return 1; }
+       [ -n "${_rc_postprocessor_fd}" ] || { unset _rc_pid; return 1; }
+       eval ": >&${_rc_postprocessor_fd}" 2>/dev/null \
        || { unset _rc_pid; return 1; }
 
        return 0