I've noticed[*] that on NetBSD, getaddrinfo(3) does a resolver lookup even if presented a numerical address. Is this on purpose? Would it have a drawback if it would first try to inet_pton() the address? On Linux, it seems to avoid the resolver lookup.
* The problem was net/nagios-plugins' check_ping to stall during a resolver malfunction (despite the addresses given numerically). It turned out that check_ping, in order to find out whether it needs to call a syntactically different ping6 command, checks whether the -H argument is IPv6. It does this eventually by calling getaddrinfo() with an AF_INET6 hint, resulting in resolver lookups, which failed.
