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Personal Computer World 2009 February
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etc
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init.d
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sendsigs
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2008-10-14
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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.
# Description:
### END INIT INFO
PATH=/sbin:/usr/sbin:/bin:/usr/bin
. /lib/lsb/init-functions
do_stop () {
OMITPIDS=
# The /var/run/sendsigs.omit file is used to be compatible
# with Ubuntu.
for omitfile in /var/run/sendsigs.omit /lib/init/rw/sendsigs.omit; do
if [ -e $omitfile ]; then
for pid in $(cat $omitfile); do
OMITPIDS="${OMITPIDS:+$OMITPIDS }-o $pid"
done
fi
done
# Load sendsigs.omit.d/packagename files too, to make it
# possible for scripts that need to modify the list of pids at
# run time without race conditions.
if [ -d /lib/init/rw/sendsigs.omit.d/ ]; then
for pidfile in /lib/init/rw/sendsigs.omit.d/*; do
[ -f "$pidfile" ] || continue
for pid in $(cat $pidfile); do
OMITPIDS="${OMITPIDS:+$OMITPIDS }-o $pid"
done
done
fi
# Flush the kernel I/O buffer before we start to kill
# processes, to make sure the IO of already stopped services to
# not slow down the remaining processes to a point where they
# are accidentily killed with SIGKILL because they did not
# manage to shut down in time.
sync
# Kill all processes.
log_action_begin_msg "Asking all remaining processes to terminate"
killall5 -15 $OMITPIDS # SIGTERM
log_action_end_msg 0
alldead=""
for seq in 1 2 3 4 5 6 7 8 9 10; do
# use SIGCONT/signal 18 to check if there are
# processes left. No need to check the exit code
# value, because either killall5 work and it make
# sense to wait for processes to die, or it fail and
# there is nothing to wait for.
if killall5 -18 $OMITPIDS ; then
:
else
alldead=1
break
fi
sleep 1
done
if [ -z "$alldead" ] ; then
log_action_begin_msg "Killing all remaining processes"
killall5 -9 $OMITPIDS # SIGKILL
log_action_end_msg 1
else
log_action_begin_msg "All processes ended within $seq seconds."
log_action_end_msg 0
fi
}
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
: