16 extern int gu_conf_set_log_file (FILE* file);
17 extern int gu_conf_set_log_callback (gu_log_cb_t callback);
18 extern int gu_conf_self_tstamp_on ();
19 extern int gu_conf_self_tstamp_off ();
20 extern int gu_conf_debug_on ();
21 extern int gu_conf_debug_off ();