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ntpd: add -w "watch" option, useful for debugging to look at our own data

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Also fixed a small buglet discovered using -w

function                                             old     new   delta
recv_and_process_peer_pkt                            895     944     +49
select_and_cluster                                  1132    1150     +18
packed_usage                                       26769   26767      -2

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-01-04 00:19:13 +01:00
parent d6459685c1
commit 4168fdd8e6
2 changed files with 28 additions and 14 deletions
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3
include/usage.h
View File

@ -3223,7 +3223,7 @@
"Address: 127.0.0.1\n"
#define ntpd_trivial_usage \
"[-dngql] [-p PEER]..."
"[-dnqwl] [-p PEER]..."
#define ntpd_full_usage "\n\n" \
"NTP client/server\n" \
"\nOptions:" \
@ -3233,6 +3233,7 @@
/* -N exists for mostly compat reasons, thus not essential to inform */ \
/* the user that it exists: user may use nice as well */ \
/* "\n -N Run at high priority" */ \
"\n -w Do not set time (used to look at peer data)" \
"\n -l Run as server on port 123" \
"\n -p PEER Obtain time from PEER (may be repeated)" \

39
networking/ntpd.c
View File

@ -192,8 +192,9 @@ enum {
OPT_x = (1 << 3),
/* Insert new options above this line. */
/* Non-compat options: */
OPT_p = (1 << 4),
OPT_l = (1 << 5) * ENABLE_FEATURE_NTPD_SERVER,
OPT_w = (1 << 4),
OPT_p = (1 << 5),
OPT_l = (1 << 6) * ENABLE_FEATURE_NTPD_SERVER,
};
struct globals {
@ -940,7 +941,7 @@ select_and_cluster(void)
double min_jitter = min_jitter;
if (num_survivors <= MIN_CLUSTERED) {
bb_error_msg("num_survivors %d <= %d, not discarding more",
VERB3 bb_error_msg("num_survivors %d <= %d, not discarding more",
num_survivors, MIN_CLUSTERED);
break;
}
@ -1381,8 +1382,8 @@ recv_and_process_peer_pkt(peer_t *p)
|| errno == EAGAIN
) {
//TODO: always do this?
set_next(p, retry_interval());
goto close_sock;
interval = retry_interval();
goto set_next_and_close_sock;
}
xfunc_die();
}
@ -1407,7 +1408,7 @@ recv_and_process_peer_pkt(peer_t *p)
// "RATE" - peer is overloaded, reduce polling freq
interval = poll_interval(0);
bb_error_msg("reply from %s: not synced, next query in %us", p->p_dotted, interval);
goto close_sock;
goto set_next_and_close_sock;
}
// /* Verify valid root distance */
@ -1466,18 +1467,30 @@ recv_and_process_peer_pkt(peer_t *p)
p->reachable_bits |= 1;
VERB1 {
bb_error_msg("reply from %s: reach 0x%02x offset %f delay %f",
bb_error_msg("reply from %s: reach 0x%02x offset %f delay %f status 0x%02x strat %d refid 0x%08x rootdelay %f",
p->p_dotted,
p->reachable_bits,
datapoint->d_offset, p->lastpkt_delay);
datapoint->d_offset,
p->lastpkt_delay,
p->lastpkt_status,
p->lastpkt_stratum,
p->lastpkt_refid,
p->lastpkt_rootdelay
/* not shown: m_ppoll, m_precision_exp, m_rootdisp,
* m_reftime, m_orgtime, m_rectime, m_xmttime
*/
);
}
/* Muck with statictics and update the clock */
filter_datapoints(p);
q = select_and_cluster();
rc = -1;
if (q)
rc = update_local_clock(q);
if (q) {
rc = 0;
if (!(option_mask32 & OPT_w))
rc = update_local_clock(q);
}
if (rc != 0) {
/* Adjust the poll interval by comparing the current offset
@ -1537,9 +1550,9 @@ recv_and_process_peer_pkt(peer_t *p)
/* Decide when to send new query for this peer */
interval = poll_interval(0);
set_next(p, interval);
close_sock:
set_next_and_close_sock:
set_next(p, interval);
/* We do not expect any more packets from this peer for now.
* Closing the socket informs kernel about it.
* We open a new socket when we send a new query.
@ -1723,7 +1736,7 @@ static NOINLINE void ntp_init(char **argv)
opt_complementary = "dd:p::"; /* d: counter, p: list */
opts = getopt32(argv,
"nqNx" /* compat */
"p:"IF_FEATURE_NTPD_SERVER("l") /* NOT compat */
"wp:"IF_FEATURE_NTPD_SERVER("l") /* NOT compat */
"d" /* compat */
"46aAbgL", /* compat, ignored */
&peers, &G.verbose);