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

 s
    A socket descriptor created with the socket() function.
 name
    Address of a structure used to assign a name to the socket in the
    format specific to the family (AF_INET) socket address.
 namelen
    The size, in bytes, of the structure pointed to by name.