ntp: Use mnemonic when specifying the request precision

This patch uses a mnemonic to specify the request precision and also
adds a comment how a future implementation might pass along the actual
system wall clock precision.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/ntp.c b/src/ntp.c
index 3e907416..e15bd083 100644
--- a/src/ntp.c
+++ b/src/ntp.c
@@ -120,10 +120,17 @@ static void send_packet(int fd, const char *server)
 	struct sockaddr_in addr;
 	ssize_t len;
 
+	/*
+	 * At some point, we could specify the actual system precision with:
+	 *
+	 *   clock_getres(CLOCK_REALTIME, &ts);
+	 *   msg.precision = (int)log2(ts.tv_sec + (ts.tv_nsec * 1.0e-9));
+	 */
 	memset(&msg, 0, sizeof(msg));
 	msg.flags = NTP_FLAGS_ENCODE(NTP_FLAG_LI_NOTINSYNC, 4, NTP_FLAG_MD_CLIENT);
 	msg.poll = 4;	// min
 	msg.poll = 10;	// max
+	msg.precision = NTP_PRECISION_S;
 
 	memset(&addr, 0, sizeof(addr));
 	addr.sin_family = AF_INET;