Batch in /etc/init.d/ not responding while daemon running?

Installing and Using OpenWrt
1

Hello guys,

I migrate from lede-17.01 to openwrt-18.06 and solving another problem:
I have write simple batch file in /etc/init.d/ to starting and stopping my project, which running as daemon

#!/bin/sh /etc/rc.common

START=100
STOP=1
USE_PROCD=1

PROG="marcon"

start_service() {
	RESULT=`pgrep $PROG`
	if [ "${RESULT:-null}" = null ]; then
		$PROG -daemon
	fi
}

stop_service() {
	killall -SIGINT $PROG
}

reload_service() {
	killall -SIGHUP $PROG
}

but in openwrt-18.04 when I write to terminal on mikrotik device "service marcon start" my program is started, but then when I write "service marcon stop" or "service marcon start" or "service marcon reload" the terminal simply freezes until the program terminates through another terminal. What I doing wrong?