99 lines
2.2 KiB
Bash
Executable File
99 lines
2.2 KiB
Bash
Executable File
#!/bin/sh
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#===============================================================================
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#
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# suspend
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#
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# Copyright (C) 2016, 2017 by Digi International Inc.
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# All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License version 2 as published by
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# the Free Software Foundation.
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#
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#
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# !Description: suspend system to RAM
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#
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#===============================================================================
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scriptname="$(basename ${0})"
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syspower="/sys/power/state"
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lockfile="/var/lock/${scriptname}.lock"
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lockfd="9"
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BT_INIT="/etc/init.d/bluetooth-init"
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BT_DAEMON="/etc/init.d/bluetooth"
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usage() {
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printf "\nSuspend system to RAM memory\n"
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printf "\nUsage: ${scriptname} [OPTIONS]\n
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-h Show this help
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\n"
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}
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suspend_interfaces() {
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# Suspend wireless interface
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if grep -qs '^wlan0' /var/run/ifstate; then
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ifdown wlan0 && up_wlan_on_resume="1"
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fi
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if grep -qs '^wlan' /proc/modules; then
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rmmod wlan
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fi
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# Suspend bluetooth interface
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hciconfig hci0 2>&1 | grep -qs UP && up_bt_on_resume="1"
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${BT_DAEMON} stop >/dev/null
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${BT_INIT} stop >/dev/null
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}
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resume_interfaces() {
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# Resume wireless interface
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if ! grep -qs '^wlan0' /var/run/ifstate; then
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[ -n "${up_wlan_on_resume}" ] && ifup wlan0
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fi
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# Resume bluetooth interface
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if [ -n "${up_bt_on_resume}" ]; then
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${BT_INIT} start >/dev/null
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${BT_DAEMON} start >/dev/null
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fi
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}
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enter_critical_section() {
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# Create lock file
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eval "exec ${lockfd}>${lockfile}"
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# Acquire the lock in non blocking mode. Otherwise, additional calls
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# to the script will be queued and the system will endlessly go in
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# and out of suspend to ram
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flock -n "${lockfd}" || exit 0
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}
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exit_critical_section() {
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# Release the lock
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flock -u "${lockfd}"
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}
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while getopts "h" c; do
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case "${c}" in
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h) usage; exit;;
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esac
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done
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if [ -f "${syspower}" ]; then
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# Avoid running multiple instances of this script in parallel
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enter_critical_section
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# Pre-suspend actions
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suspend_interfaces
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# Suspend the device
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printf "mem" > ${syspower}
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# Post-resume actions
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resume_interfaces
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exit_critical_section
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else
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printf "\n[ERROR] File ${syspower} not found\n\n"
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fi
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