Bug#401645: [pkg-wpa-devel] Bug#401645: wpasupplicant is stopped too early at reboot/shutdown

[Przemyslaw Bruski]

Hi,

here's the updated version of sendsigs script: better English, sed is 
not required anymore,
useless assignment is removed.

bye,

Przemek
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#! /bin/sh
### BEGIN INIT INFO
# Provides:          sendsigs
# Required-Start:    
# Required-Stop:     umountnfs
# Default-Start:
# Default-Stop:      0 6
# Short-Description: Kill all remaining processes except for crucial ones.
# Description: 
### END INIT INFO

PATH=/usr/sbin:/usr/bin:/sbin:/bin

. /lib/lsb/init-functions

#lists all ancestor pids, until pid number 0 is reached
getAncestorPids() {
	local pid=$1
	local ppids=

	while true; do
		ppid=$(ps --no-headers --format ppid $pid)
		if [ $ppid -eq 0 ]; then
			break;
		fi
		ppids=$ppid" "$ppids
		pid=$ppid
	done
	echo $ppids
}


# Replacement for killall5 command. Just like killall5 does, it sends
# a signal to all processes except for: ancestor processes, itself
# and kernel threads.
# Addtionally, it skips all processes that had been run using command
# name passed as a parameter.
#
# arguments:
# signalnumber
# list of command names that should not be killed
killall5_except() {
	local signalNumber="$1"
	shift 
	local myPid=$$
	local preciousPids=$(ps --no-headers --format pid -C "$*")
	#initial precious pids are: my pid and pids of processes given as parameters
	preciousPids=$myPid" "$preciousPids
	local ancestorPids=

	for preciousPid in $preciousPids; do
		ancestorPids=$ancestorPids" "$(getAncestorPids $preciousPid)
	done

	#kernel threads should not be killed, either. Kernel threads have userspace size of 0.
	local kernelThreadPids=$(ps --format pid,size --no-headers -A |
		while read pid size; do 
			[ $size -eq 0 ] && echo $pid
		done
	)

	allPreciousPids="$preciousPids $ancestorPids $kernelThreadPids"

	allPidsToTerminate=$(ps --deselect --no-headers --format pid --pid $allPreciousPids)
	
	#a trick to eliminate ps pid from the list
	allPidsToTerminate=$(ps --no-headers --format pid --pid $allPidsToTerminate)

	if [ ! -z "$allPidsToTerminate" ]; then
	    kill $signalNumber $allPidsToTerminate
	fi
}

do_stop () {
	# Kill all processes.
	log_action_begin_msg "Asking all remaining processes to terminate"
	killall5_except -15 wpa_supplicant usplash
	log_action_end_msg 0
	sleep 5
	log_action_begin_msg "Killing all remaining processes"
	killall5_except -9 wpa_supplicant usplash
	log_action_end_msg 0
}

case "$1" in
  start)
	# No-op
	;;
  restart|reload|force-reload)
	echo "Error: argument '$1' not supported" >&2
	exit 3
	;;
  stop)
	do_stop
	;;
  *)
	echo "Usage: $0 start|stop" >&2
	exit 3
	;;
esac

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