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smooth: add option to smooth out only leap seconds

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The leaponly option can be used to enable a mode where only leap seconds
are smoothed out and normal offset/frequency changes are ignored. This
is useful to make the interval in which a leap second is smoothed out
constant and allow an NTP client to use multiple leap smearing servers
safely.
This commit is contained in:
Miroslav Lichvar
2015-06-02 13:24:04 +02:00
parent 31669f343a
commit 0abdc2a350
6 changed files with 61 additions and 20 deletions
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18
conf.c
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@@ -189,6 +189,7 @@ static char *pidfile;
/* Smoothing constants */
static double smooth_max_freq = 0.0; /* in ppm */
static double smooth_max_wander = 0.0; /* in ppm/s */
static int smooth_leap_only = 0;
/* Temperature sensor, update interval and compensation coefficients */
static char *tempcomp_sensor_file = NULL;
@@ -1174,11 +1175,23 @@ parse_broadcast(char *line)
static void
parse_smoothtime(char *line)
{
check_number_of_args(line, 2);
if (get_number_of_args(line) != 3)
check_number_of_args(line, 2);
if (sscanf(line, "%lf %lf", &smooth_max_freq, &smooth_max_wander) != 2) {
smooth_max_freq = 0.0;
command_parse_error();
}
line = CPS_SplitWord(CPS_SplitWord(line));
smooth_leap_only = 0;
if (*line) {
if (!strcasecmp(line, "leaponly"))
smooth_leap_only = 1;
else
command_parse_error();
}
}
/* ================================================== */
@@ -1738,10 +1751,11 @@ CNF_GetLockMemory(void)
/* ================================================== */
void
CNF_GetSmooth(double *max_freq, double *max_wander)
CNF_GetSmooth(double *max_freq, double *max_wander, int *leap_only)
{
*max_freq = smooth_max_freq;
*max_wander = smooth_max_wander;
*leap_only = smooth_leap_only;
}
/* ================================================== */