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Add fallback drifts

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Fallback drifts are long-term averages of the system clock drift
calculated over exponentially increasing intervals. They are used when
the clock is unsynchronised to avoid quickly drifting away from true
time if there was a short-term deviation in drift before the
synchronisation was lost.
This commit is contained in:
Miroslav Lichvar
2010-04-09 14:29:11 +02:00
parent 99d18abf59
commit f12bc10917
4 changed files with 217 additions and 0 deletions
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25
conf.c
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@@ -92,6 +92,7 @@ static void parse_cmdport(const char *);
static void parse_rtconutc(const char *);
static void parse_noclientlog(const char *);
static void parse_clientloglimit(const char *);
static void parse_fallbackdrift(const char *);
static void parse_makestep(const char *);
static void parse_logchange(const char *);
static void parse_mailonchange(const char *);
@@ -166,6 +167,10 @@ static int no_client_log = 0;
/* Limit memory allocated for the clients log */
static unsigned long client_log_limit = 524288;
/* Minimum and maximum fallback drift intervals */
static int fb_drift_min = 0;
static int fb_drift_max = 0;
/* IP addresses for binding the NTP socket to. UNSPEC family means INADDR_ANY
will be used */
static IPAddr bind_address4, bind_address6;
@@ -225,6 +230,7 @@ static const Command commands[] = {
{"rtconutc", 8, parse_rtconutc},
{"noclientlog", 11, parse_noclientlog},
{"clientloglimit", 14, parse_clientloglimit},
{"fallbackdrift", 13, parse_fallbackdrift},
{"makestep", 8, parse_makestep},
{"logchange", 9, parse_logchange},
{"mailonchange", 12, parse_mailonchange},
@@ -805,6 +811,16 @@ parse_clientloglimit(const char *line)
/* ================================================== */
static void
parse_fallbackdrift(const char *line)
{
if (sscanf(line, "%d %d", &fb_drift_min, &fb_drift_max) != 2) {
LOG(LOGS_WARN, LOGF_Configure, "Could not read fallback drift intervals at line %d", line_number);
}
}
/* ================================================== */
static void
parse_makestep(const char *line)
{
@@ -1424,6 +1440,15 @@ CNF_GetClientLogLimit(void)
/* ================================================== */
void
CNF_GetFallbackDrifts(int *min, int *max)
{
*min = fb_drift_min;
*max = fb_drift_max;
}
/* ================================================== */
void
CNF_GetBindAddress(int family, IPAddr *addr)
{