>>  | 	gethostby* and friends.
>>gethostby*() and friends don't need thread safe back ends, because
>>they're not thread safe themselves, and do not need to be, according
>>to the relevant standards (SUSv2, SUSv3).
>	"friends" include gethostby*_r.

	and getaddrinfo/getnameinfo are the obvious ones who need *hostent/NIS
	backend and have to be thread safe.

itojun