make the procedure for killing child processes of services configurable

etc/rc.conf

@@ -277,10 +277,33 @@ rc_tty_number=12
 
 # Set this to YES if you want all of the processes in a service's cgroup
 # killed when the service is stopped or restarted.
-# This should not be set globally because it kills all of the service's
-# child processes, and most of the time this is undesirable. Please set
-# it in /etc/conf.d/<service>.
+# Be aware that setting this to yes means all of a service's
+# child processes will be killed. Keep this in mind if you set this to
+# yes here instead of for the individual services in
+# /etc/conf.d/<service>.
 # To perform this cleanup manually for a stopped service, you can
 # execute cgroup_cleanup with /etc/init.d/<service> cgroup_cleanup or
 # rc-service <service> cgroup_cleanup.
+# The process followed in this cleanup is the following:
+# 1. send stopsig (sigterm if it isn't set) to all processes left in the
+# cgroup immediately followed by sigcont.
+# 2. Send sighup to all processes in the cgroup if rc_send_sighup is
+# yes.
+# 3. delay for rc_timeout_stopsec seconds.
+# 4. send sigkill to all processes in the cgroup unless disabled by
+# setting rc_send_sigkill to no.
 # rc_cgroup_cleanup="NO"
+
+# If this is yes, we will send sighup to the processes in the cgroup
+# immediately after stopsig and sigcont.
+#rc_send_sighup="NO"
+
+# This is the amount of time in seconds that we delay after sending sigcont
+# and optionally sighup, before we optionally send sigkill to all
+# processes in the # cgroup.
+# The default is 90 seconds.
+#rc_timeout_stopsec="90"
+
+# If this is set to no, we do not send sigkill to all processes in the
+# cgroup.
+#rc_send_sigkill="YES"

sh/rc-cgroup.sh.in

@@ -204,10 +204,13 @@ cgroup_cleanup()
 	local pids
 	pids="$(cgroup_get_pids)"
 	if [ -n "${pids}" ]; then
-		kill -s TERM "${pids}"
-		sleep 1
-		pids="$(cgroup_get_pids)"
-		[ -n "${pids}" ] &&
-			kill -s KILL "${pids}"
+		kill -s "${stopsig:-SIGTERM}" ${pids} 2> /dev/null
+		kill -s SIGCONT ${pids} 2> /dev/null
+		yesno "${rc_send_sighup:-no}" &&
+			kill -s SIGHUP ${pids} 2> /dev/null
+		sleep "${rc_timeout_stopsec:-90}"
+		yesno "${rc_send_sigkill:-yes}" &&
+			kill -s SIGKILL ${pids} 2> /dev/null
 	fi
+	eend 0
 }