ipsec_portof(3) on Linux
The text ff0f41d2034e, as Debian 5.0 (Lenny) shipped it.
get port field of an ip_address ipsec setportof - set port field of an ip_address ipsec sockaddrof - get pointer to internal sockaddr of an ip_address ipsec sockaddrlenof - get length of internal sockaddr of an ip_address