From 739ac42b5ee9204936b5e9affe30326582d120e3 Mon Sep 17 00:00:00 2001
From: chuck <chuck@NetBSD.org>
Date: Thu, 25 Jan 2001 00:48:59 +0000
Subject: [PATCH] be more picky about running /etc/apm/{battery,line} in
 response to APM_POWER_CHANGE event.   some BIOS post this event periodically
 while the battery is charging/discharging (no change in a/c state). on these
 systems this prevents /etc/apm/{battery,line} from being run multiple times.

---
 usr.sbin/apmd/apmd.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/usr.sbin/apmd/apmd.c b/usr.sbin/apmd/apmd.c
index ec49056382f0..5fee47dc4bd5 100644
--- a/usr.sbin/apmd/apmd.c
+++ b/usr.sbin/apmd/apmd.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: apmd.c,v 1.16 2001/01/11 01:35:53 lukem Exp $	*/
+/*	$NetBSD: apmd.c,v 1.17 2001/01/25 00:48:59 chuck Exp $	*/
 
 /*-
  * Copyright (c) 1996, 2000 The NetBSD Foundation, Inc.
@@ -314,6 +314,7 @@ main(int argc, char *argv[])
     fd_set selcopy;
     struct apm_event_info apmevent;
     int suspends, standbys, resumes;
+    int ac_is_off;
     int noacsleep = 0;
     int lowbattsleep = 0;
     mode_t mode = 0660;
@@ -414,6 +415,7 @@ main(int argc, char *argv[])
 	struct apm_power_info pinfo;
 	power_status(ctl_fd, 1, &pinfo);
 	do_ac_state(pinfo.ac_state);
+	ac_is_off = (pinfo.ac_state == APM_AC_OFF);
     }
 
     (void) signal(SIGTERM, sigexit);
@@ -484,7 +486,11 @@ main(int argc, char *argv[])
 		{
 		    struct apm_power_info pinfo;
 		    power_status(ctl_fd, 0, &pinfo);
-		    do_ac_state(pinfo.ac_state);
+		    /* power status can change without ac status changing */
+		    if (ac_is_off != (pinfo.ac_state == APM_AC_OFF)) {
+		    	do_ac_state(pinfo.ac_state);
+			ac_is_off = (pinfo.ac_state == APM_AC_OFF);
+		    }
 		    break;
 		}
 		default: