ENGINE_ctrl_cmd_string
if (!ENGINE_ctrl_cmd_string(e, "SO_PATH", ctrlvalue, 0))
if (!ENGINE_ctrl_cmd_string(e, "LIST_ADD", "2", 0))
if (!ENGINE_ctrl_cmd_string(e, "LOAD", NULL, 0))
} else if (!ENGINE_ctrl_cmd_string(e,
int ENGINE_ctrl_cmd_string(ENGINE *e, const char *cmd_name, const char *arg,