/sys$common/syshlp/helplib.hlb TCPIP Services, Programming Interfaces, Sockets API, gethostname(), Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 name
    The address of a buffer where the name should be returned. The
    returned name is null terminated unless sufficient space is not
    provided.
 namelen
    The size of the buffer pointed to by name.