NFS_CALLBCKPROG
svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program,
GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS);
rpc_gss_clear_svc_name_call(NFS_CALLBCKPROG, NFSV4_CBVERS);
*tl = txdr_unsigned(NFS_CALLBCKPROG);
*tl++ = txdr_unsigned(NFS_CALLBCKPROG); /* Call back prog # */