how to start up tap when use libbsd?

yao0718 29171383 at
Tue Apr 18 05:07:25 UTC 2017

hi,     I try to port a vpn package to rtems, I used libbsd, and I find tap source has been included in libbsd,But I do not know how to create a tap when use
libbsd , I try to used ifconfig command to create tap  but failure,Can you give me some advice?

ifconfig tap0 create inet up
ifconfig: SIOCIFCREATE2: Invalid argument

best regards
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