On Fri, May 3, 2013 at 3:47 PM, Andreas Helmcke <[email protected]> wrote:
> Hello,
>
> I am trying to find a way to keep hwclock in sync with the ntp-synced system
> time using busysbox ntpd.
> Ntpd is able to start a script after each change and every 11 minutes
> (parameter -S) but there seems to be no way to
> find out if the time is still synchronized i.e. there is at least one valid
> ntp server.
> The attached patch exports one more value to the script
> (last_update_recv_time) so that the script can at least check if
> the last update is within some limit.
> I consider this a workaround rather than a real solution because I would
> expect
> ntpd to set stratum to 16 when loosing contact to the upstream ntp servers
> but I could not find a proper way to handle this.
> Anyone any suggestions?
I will add something like this in main loop:
if (G.ntp_peers && G.stratum != MAXSTRAT) {
for (item = G.ntp_peers; item != NULL; item =
item->link) {
peer_t *p = (peer_t *) item->data;
if (p->p->reachable_bits)
goto have_reachable_peer;
}
/* No peer responded for last 8 packets, panic */
G.polladj_count = 0;
G.poll_exp = MINPOLL;
G.stratum = MAXSTRAT;
run_script("unsync", G.last_update_offset);
have_reachable_peer: ;
}
} /* while (!bb_got_signal) */
and the script can look for unsync event.
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