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Add support for reading leap second data from tz database

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leapsectz directive is used to set the name of the timezone in the
system tz database which chronyd can use to find out when will the next
leap second occur.  It will periodically check if dates Jun 30 23:59:60
and Dec 31 23:59:60 are valid in that timezone. This is mainly useful
with reference clocks which don't provide the leap second information.
It is not necessary to restart chronyd if the tz database is updated
with a new leap second at least 12 hours before the event.
This commit is contained in:
Miroslav Lichvar
2012-02-23 18:48:24 +01:00
parent f7c65a4b88
commit 2a5c045c3d
4 changed files with 128 additions and 13 deletions
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23
conf.c
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@@ -112,6 +112,7 @@ static void parse_sched_priority(const char *);
static void parse_lockall(const char *);
static void parse_tempcomp(const char *);
static void parse_include(const char *);
static void parse_leapsectz(const char *);
/* ================================================== */
/* Configuration variables */
@@ -224,6 +225,9 @@ static double linux_freq_scale;
static int sched_priority = 0;
static int lock_memory = 0;
/* Name of a system timezone containing leap seconds occuring at midnight */
static char *leapsec_tz = NULL;
/* ================================================== */
typedef struct {
@@ -276,6 +280,7 @@ static const Command commands[] = {
{"reselectdist", 12, parse_reselectdist},
{"stratumweight", 13, parse_stratumweight},
{"include", 7, parse_include},
{"leapsectz", 9, parse_leapsectz},
{"linux_hz", 8, parse_linux_hz},
{"linux_freq_scale", 16, parse_linux_freq_scale},
{"sched_priority", 14, parse_sched_priority},
@@ -1282,6 +1287,16 @@ parse_include(const char *line)
/* ================================================== */
static void
parse_leapsectz(const char *line)
{
/* This must allocate enough space! */
leapsec_tz = MallocArray(char, 1 + strlen(line));
sscanf(line, "%s", leapsec_tz);
}
/* ================================================== */
static void
parse_linux_hz(const char *line)
{
@@ -1707,6 +1722,14 @@ CNF_GetPidFile(void)
/* ================================================== */
char *
CNF_GetLeapSecTimezone(void)
{
return leapsec_tz;
}
/* ================================================== */
void
CNF_GetLinuxHz(int *set, int *hz)
{