DSO_ctrl
if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) {
DSO_ctrl(ctx->dynamic_dso, DSO_CTRL_SET_FLAGS,
DSO_ctrl(prov->module, DSO_CTRL_SET_FLAGS,
long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg);