# service portreserve stop
Stopping portreserve: 

# service portreserve status; echo $?
portreserve is stopped
0

# service portreserve status; echo $?
portreserve is stopped
0

Compare this with other services, say, ip6tables:

# service ip6tables stop
ip6tables: Flushing firewall rules:                        [  OK  ]
ip6tables: Setting chains to policy ACCEPT: filter         [  OK  ]
ip6tables: Unloading modules:                              [  OK  ]
# service ip6tables status; echo $?
ip6tables: Firewall is not running.
3


Among other things, this makes the service "unstoppable" in GUI service
config (System->Administration->Services): you can press on "stop" button
however many times you like, the service is still "running". One side effect of
bogus "running" status is that it can not be *started* using GUI: GUI thinks it
already is, and "start" button is greyed out!