wpa_supplicant_scan
eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
void wpa_supplicant_scan(void *, void *);
(void) eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
(void) eloop_register_timeout(sec, usec, wpa_supplicant_scan,
eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);