RFC 2553's "getaddrinfo" and "getnameinfo" functions

The RFC 2553 functions getaddrinfo and getnameinfo provide an abstracted
way to convert between a pair of host name/service name and socket
addresses, or vice versa. getaddrinfo converts names into a set of
arguments to pass to the socket() and connect() syscalls, and getnameinfo
converts a socket address back into its host name/service name pair.