strongSwan

I'm currently trying to start ipsec from a C program, which is providing a command line interface on my embedded system.

Using a system("/sbin/ipsec start &> /tmp/ipsec.start") to start strongSwan and having configured a file logger in /etc/strongswan.conf i hoped i could redirect all output from the daemons to a file.
I figured that this would result in a silent startup, but it didn't. I guess the redirect isn't working because ipsec starter does a fork. The configured logfile is filled with everything I expected, so there seems to be no problem. But there are still a couple of messages left that appear on my CLI:

ipsec_starter[334]: Starting strongSwan 5.0.0 IPsec [starter]...
ipsec_starter[348]: listening on interfaces:
ipsec_starter[348]:   eth0
ipsec_starter[348]:     192.168.0.172
... and a couple more interfaces ...
ipsec_starter[348]: charon (349) started after 100 ms
ipsec_starter[348]: 'PSKTest' routed

My strongswan.conf looks like this:

charon {
        filelog {
                /tmp/ipsec.log {
                time_format = %b %e %T
                append = no
                default = 2
                flush_line = yes
                }
        }
}

So currently there seems to be no way to silence strongSwan completely, or did I miss something?
In short, I need strongSwan to log everything to a file and not to put anything to stdout or stderr...

You can try this yourself, just by executing "ipsec start &> /tmp/ipsec.start" on your shell. This behaves exactly like calling it with system() from a program written in C. Note that /tmp/ipsec.start isn't empty, I guess this is the output before the fork...

Thanks in advance
PS: I know this seems not very important. But with "a couple more interfaces" I mean about 200 in my case. So this is really annoying...