ddfops
static const struct ddfops ddfops_stdfd = {
extern const struct ddfops ddfops_prog;
const struct ddfops *prog_ops = &ddfops_stdfd;
const struct ddfops *prog_ops = &ddfops_prog;
struct ddfops const *ops; /* ops to use with fd */
const struct ddfops ddfops_prog = {
const struct ddfops ddfops_prog = {