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1#!/bin/sh
2#
3# apmd_proxy - program dispatcher for APM daemon
4#
5# Written by Craig Markwardt (craigm@lheamail.gsfc.nasa.gov) 21 May 1999
6# Modified for Debian by Avery Pennarun
7#
8# This shell script is called by the APM daemon (apmd) when a power
9# management event occurs. Its first and second arguments describe the
10# event. For example, apmd will call "apmd_proxy suspend system" just
11# before the system is suspended.
12#
13# Here are the possible arguments:
14#
15# start - APM daemon has started
16# stop - APM daemon is shutting down
17# suspend critical - APM system indicates critical suspend (++)
18# suspend system - APM system has requested suspend mode
19# suspend user - User has requested suspend mode
20# standby system - APM system has requested standby mode
21# standby user - User has requested standby mode
22# resume suspend - System has resumed from suspend mode
23# resume standby - System has resumed from standby mode
24# resume critical - System has resumed from critical suspend
25# change battery - APM system reported low battery
26# change power - APM system reported AC/battery change
27# change time - APM system reported time change (*)
28# change capability - APM system reported config. change (+)
29#
30# (*) - APM daemon may be configured to not call these sequences
31# (+) - Available if APM kernel supports it.
32# (++) - "suspend critical" is never passed to apmd from the kernel,
33# so we will never see it here. Scripts that process "resume
34# critical" events need to take this into account.
35#
36# It is the proxy script's responsibility to examine the APM status
37# (via /proc/apm) or other status and to take appropriate actions.
38# For example, the script might unmount network drives before the
39# machine is suspended.
40#
41# In Debian, the usual way of adding functionality to the proxy is to
42# add a script to /etc/apm/event.d. This script will be called by
43# apmd_proxy (via run-parts) with the same arguments.
44#
45# If it is important that a certain set of script be run in a certain
46# order on suspend and in a different order on resume, then put all
47# the scripts in /etc/apm/scripts.d instead of /etc/apm/event.d and
48# symlink to these from /etc/apm/suspend.d, /etc/apm/resume.d and
49# /etc/apm/other.d using names whose lexicographical order is the same
50# as the desired order of execution.
51#
52# If the kernel's APM driver supports it, apmd_proxy can return a non-zero
53# exit status on suspend and standby events, indicating that the suspend
54# or standby event should be rejected.
55#
56# *******************************************************************
57
58set -e
59
60# The following doesn't yet work, because current kernels (up to at least
61# 2.4.20) do not support rejection of APM events. Supporting this would
62# require substantial modifications to the APM driver. We will re-enable
63# this feature if the driver is ever modified. -- cph@debian.org
64#
65#SUSPEND_ON_AC=false
66#[ -r /etc/apm/apmd_proxy.conf ] && . /etc/apm/apmd_proxy.conf
67#
68#if [ "${SUSPEND_ON_AC}" = "false" -a "${2}" = "system" ] \
69# && on_ac_power >/dev/null; then
70# # Reject system suspends and standbys if we are on AC power
71# exit 1 # Reject (NOTE kernel support must be enabled)
72#fi
73
74if [ "${1}" = "suspend" -o "${1}" = "standby" ]; then
75 run-parts -a "${1}" -a "${2}" /etc/apm/event.d
76 if [ -d /etc/apm/suspend.d ]; then
77 run-parts -a "${1}" -a "${2}" /etc/apm/suspend.d
78 fi
79elif [ "${1}" = "resume" ]; then
80 if [ -d /etc/apm/resume.d ]; then
81 run-parts -a "${1}" -a "${2}" /etc/apm/resume.d
82 fi
83 run-parts -a "${1}" -a "${2}" /etc/apm/event.d
84else
85 run-parts -a "${1}" -a "${2}" /etc/apm/event.d
86 if [ -d /etc/apm/other.d ]; then
87 run-parts -a "${1}" -a "${2}" /etc/apm/other.d
88 fi
89fi
90
91exit 0