VMS Help TCPIP Services, Programming Interfaces, RPC XDR Routines, xdr_authunix_parms  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Serializes and deserializes credentials in an authentication
    parameter structure.
    Format
      #include  <tcpip$rpcxdr.h>
      bool_t xdr_authunix_parms  (XDR *xdrs, struct authunix_parms
                                 *authp);

1 - Arguments

 xdrs
    A pointer to an XDR stream handle created by one of the XDR
    stream handle creation routines.
 authp
    A pointer to an authunix_parms structure.

2 - Description

    Used for externally describing standard UNIX credentials. On a
    TCP/IP Services host, this routine encodes the host name, the
    user ID, and the group ID. It sets the group ID list to NULL.
    This routine is useful for users who want to generate these
    credentials without using the ONC RPC authentication package.

3 - Return Values

    TRUE               Indicates success.
    FALSE              Indicates failure.