diff options
| author | Gary E. Miller <gem@rellim.com> | 2015-03-10 14:11:37 -0700 |
|---|---|---|
| committer | Gary E. Miller <gem@rellim.com> | 2015-03-10 14:11:37 -0700 |
| commit | 990eda0328688517e9259113188a90533c751fbc (patch) | |
| tree | 109eaa33014d94fb48effdd5a00c8e2a14cf2c3e /ntpshmwrite.c | |
| parent | a69e13c8b157dc66372daafff8f0e168ee3865a7 (diff) | |
| download | gpsd-990eda0328688517e9259113188a90533c751fbc.tar.gz | |
Only allow leap seconds in June and December.
Per Hal Murray and http://bugs.ntp.org/1090
Diffstat (limited to 'ntpshmwrite.c')
| -rw-r--r-- | ntpshmwrite.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/ntpshmwrite.c b/ntpshmwrite.c index f001d9ea..6370ee47 100644 --- a/ntpshmwrite.c +++ b/ntpshmwrite.c @@ -21,10 +21,24 @@ #include "ntpshm.h" #include "compiler.h" +#define LEAP_NOWARNING 0x0 /* normal, no leap second warning */ + void ntp_write(volatile struct shmTime *shmseg, struct timedelta_t *td, int precision, int leap_notify) /* put a received fix time into shared memory for NTP */ { + struct tm tm; + + /* insist that leap seconds only happen in june and december + * GPS emits leap pending for 3 months prior to insertion + * NTP expects leap pending for only 1 month prior to insertion + * Per http://bugs.ntp.org/1090 */ + (void)gmtime_r( &(td->real.tv_sec), &tm); + if ( 5 != tm.tm_mon && 11 != tm.tm_mon ) { + /* Not june, not December, no way */ + leap_notify = LEAP_NOWARNING; + } + /* we use the shmTime mode 1 protocol * * ntpd does this: |