VMS Help TCPIP Services, Programming Interfaces, Sockets API, getservbyname(), Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 name
    A pointer to a string containing the name of the service about
    which information is required.
 proto
    A pointer to a string containing the name of the protocol (TCP or
    UDP) for which to search.