ntpd: Check STA_NANO in the server status

When STA_NANO is set in ik->status, then results are
expressed in nanoseconds (instead of microseconds by default).

Signed-off-by: Matwey V. Kornilov <matwey.kornilov@gmail.com>

diff --git a/src/ntpd.c b/src/ntpd.c
index 1071d0b..34a084b 100644 (file)
--- a/src/ntpd.c
+++ b/src/ntpd.c
@@ -51,6 +51,10 @@
 # include <poll.h>
 #endif
 
+#ifndef STA_NANO
+# define STA_NANO 0x2000
+#endif
+
 static const char *config_keys[] =
 {
        "Host",
@@ -910,8 +914,7 @@ static int ntpd_read (void)
        int i;
 
        /* On Linux, if the STA_NANO bit is set in ik->status, then ik->offset
-        * is is nanoseconds, otherwise it's microseconds.
-        * TODO(octo): STA_NANO is defined in the Linux specific <sys/timex.h> header. */
+        * is is nanoseconds, otherwise it's microseconds. */
        double scale_loop  = 1e-6;
        double scale_error = 1e-6;
 
@@ -936,6 +939,11 @@ static int ntpd_read (void)
                return (-1);
        }
 
+       if (ntohs(ik->status) & STA_NANO) {
+               scale_loop  = 1e-9;
+               scale_error = 1e-9;
+       }
+
        /* kerninfo -> estimated error */
        offset_loop  = scale_loop * ((gauge_t) ntohl (ik->offset));
        freq_loop    = ntpd_read_fp (ik->freq);