ZCP_ARG_ARGLIST
fnvlist_add_nvlist(args, ZCP_ARG_ARGLIST, argnvl);
fnvlist_add_nvlist(args, ZCP_ARG_ARGLIST, argcopy);
fnvlist_add_nvlist(wrapper, ZCP_ARG_ARGLIST, arg);
nvarg = fnvlist_lookup_nvpair(innvl, ZCP_ARG_ARGLIST);