ldapd_sig_handler
signal_set(&ev_sigint, SIGINT, ldapd_sig_handler, NULL);
signal_set(&ev_sigterm, SIGTERM, ldapd_sig_handler, NULL);
signal_set(&ev_sighup, SIGHUP, ldapd_sig_handler, NULL);
void ldapd_sig_handler(int fd, short why, void *data);