dns_ip4_qualify
feeds the name
udn
through
qualification(5)
and looks up 4-byte IP addresses for the result. It puts the fully
qualified domain name into
fqdn,
puts the concatenation of the IP addresses into
out,
and returns 0. If the domain does not exist in DNS, or has no IP addresses,
out
will be empty.
If
dns_ip4_qualify
has trouble with the
qualification(5),
has trouble with DNS, or runs out of memory, it returns -1, setting
errno
appropriately. It may or may not change
out
and
fqdn.