getifaddrs

[Momchil Velikov]

Functions ``__ifreq'' and ``getifaddrs'' were changed to support
``struct sockaddr'' structures of arbitrary size.

The fields ``ifa_netmask'' and ``ifa_broadaddr'' are set to NULL, if
the coresponding ``ioctl'' fails, per BSD manual pages.

On NetBSD these ioctls fail for the large number of down interfaces,
as a result no information can be obtained for up interfaces.

~velco
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