Another problem with returning non-up interfaces is that you may get
errors when trying to get addresses on them:
% ./iflist
iflist in free(): warning: modified (chunk-) pointer.
Error in pcap_findalldevs: SIOCGIFNETMASK: lp0: Can't assign requested
address
% ifconfig -a
fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet XXX.XXX.XXX.XXX netmask 0xXXXXXXXX broadcast XXX.XXX.XXX.XX
inet YYY.YYY.YYY.YYY netmask 0xYYYYYYYY broadcast YYY.YYY.YYY.YYY
ether ZZ:ZZ:ZZ:ZZ:ZZ:ZZ
media: autoselect (10baseT/UTP) status: active
supported media: autoselect 100baseTX <full-duplex> 100baseTX
10baseT/UTP <full-duplex> 10baseT/UTP
lp0: flags=8810<POINTOPOINT,SIMPLEX,MULTICAST> mtu 1500
tun0: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
sl0: flags=c010<POINTOPOINT,LINK2,MULTICAST> mtu 552
ppp0: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet 127.0.0.1 netmask 0xff000000
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