Hi,
here's the updated version of sendsigs script: better English, sed is
not required anymore,
useless assignment is removed.
bye,
Przemek
#! /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
:
