BUG #14959: init script is trying to run postmaster with forground

The following bug has been logged on the website:

Bug reference:      14959
Logged by:          fune todanano
Email address:      todanano@gmail.com
PostgreSQL version: 9.6.6
Operating system:   CentOS release 6.9 (Final)
Description:

init script is trying to run postmaster with forground.

At this point, control is not returned where postmaster is about to
operate.

It was operated as follows.

#       $SU -l postgres -c "$PGENGINE/postmaster -D '$PGDATA' ${PGOPTS}
>>\"$PGLOG\" 2>&1"
        $SU -l postgres -c "$PGENGINE/postmaster -D '$PGDATA' ${PGOPTS} &"
>> "$PGLOG" 2>&1 < /dev/null


Although it may not be a problem with systemd, it is a problem with init.