dnvlist_get_binary
caprightsp = dnvlist_get_binary(newlimits, "cap_rights", NULL, NULL, 0);
reqmib = dnvlist_get_binary(req, "mib", &reqsize, NULL, 0);
lmib = dnvlist_get_binary(limit, "mib", &lsize, NULL, 0);
actual_value = dnvlist_get_binary(nvl, k, &actual_size, "g", 1);
actual_value = dnvlist_get_binary(nvl, key, &actual_size, default_value,
actual_value = dnvlist_get_binary(nvl, key, &actual_size, default_value,
actual_value = dnvlist_get_binary(nvl, "k", &actual_size, default_value,
actual_value = dnvlist_get_binary(nvl, "s", &actual_size, default_value,
const void *dnvlist_get_binary(const nvlist_t *nvl, const char *name, size_t *sizep, const void *defval, size_t defsize);