RFC2553 "Basic Socket Interface Extensions for IPv6" I 13
RFC 2553 Basic Socket Interface Extensions for IPv6 March 1999
The first argument, sa, points to either a sockaddr_in structure (for
IPv4) or a sockaddr_in6 structure (for IPv6) that holds the IP
address and port number. The salen argument gives the length of the
sockaddr_in or sockaddr_in6 structure.
The function returns the nodename associated with the IP address in
the buffer pointed to by the host argument. The caller provides the
size of this buffer via the hostlen argument. The service name
associated with the port number is returned in the buffer pointed to ...
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