wait flag for killall5

rc.in

@@ -101,10 +101,10 @@ rc.services_stop() {
 
 rc.stop_everything() {
 	echo "Politely asking all processes to shut down..."
-	killall5 -15; sleep 3
+	killall5 -s 15 -w "${cfg_killall5_timeout:-30}"
 
 	echo "Killing the remaning ones..."
-	killall5 -9
+	killall5 -s 9
 }
 
 rc.unmount_everything() {

tools/killall5.in

@@ -37,14 +37,58 @@ get_procs_to_kill() {
 	done
 }
 
+pids_exist() {
+	for i in "$@"; do
+		if kill -0 "$i" 2>/dev/null; then
+			return 0
+		fi
+	done
+}
+
+pid_wait() {
+	declare counter
+
+	while pids_exist "$@"; do
+		if (( counter = timeout )); then
+			return 1
+		fi
+
+		sleep 1
+
+		(( counter++ ))
+	done
+}
+
 main() {
+	timeout=30
+	signal=15
+
+	while (( $# )); do
+		case $1 in
+			-w)
+				flag_wait=1
+				timeout=$2
+				shift
+			;;
+
+			-s)
+				signal=$2
+				shift
+			;;
+		esac
+
+		shift
+	done
+
 	my_tree=( $(get_my_tree) self thread-self )
 	all_procs=( $(get_all_procs) )
 	procs_to_kill=( $(get_procs_to_kill) )
 
-	signal="${1:-"-15"}"
+	kill -n "$signal" "${procs_to_kill[@]}" 2>/dev/null
 
-	kill "$signal" "${procs_to_kill[@]}" 2>/dev/null
+	if (( flag_wait )); then
+		pid_wait "${procs_to_kill[@]}"
+	fi
 
 	return 0
 }