From b1cbf2c14a2d0064e8d1fe457c8d6bfac595dac6 Mon Sep 17 00:00:00 2001
From: Brent Cook <bcook@openbsd.org>
Date: Tue, 17 May 2016 07:57:54 -0500
Subject: [PATCH] experimental time sync bits, see #25

---
 compat/adjfreq_freebsd.c |  5 ++++-
 compat/adjfreq_linux.c   |  5 ++++-
 compat/adjfreq_netbsd.c  |  5 ++++-
 compat/adjfreq_solaris.c | 10 +++++++++-
 4 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/compat/adjfreq_freebsd.c b/compat/adjfreq_freebsd.c
index 8011dad..adadee3 100644
--- a/compat/adjfreq_freebsd.c
+++ b/compat/adjfreq_freebsd.c
@@ -68,7 +68,10 @@ update_time_sync_status(int synced)
 	struct timex txc = { 0 };
 
 	txc.modes = MOD_STATUS;
-	if (!synced)
+	if (synced) {
+		txc.modes |= MOD_MAXERROR;
+		txc.maxerror = 0;
+	} else
 		txc.status = STA_UNSYNC;
 	if (ntp_adjtime(&txc) == -1)
 		log_warn("ntp_adjtime (3) failed");
diff --git a/compat/adjfreq_linux.c b/compat/adjfreq_linux.c
index 217b23a..0d72e5b 100644
--- a/compat/adjfreq_linux.c
+++ b/compat/adjfreq_linux.c
@@ -68,7 +68,10 @@ update_time_sync_status(int synced)
 	struct timex txc = { 0 };
 
 	txc.modes = MOD_STATUS;
-	if (!synced)
+	if (synced) {
+		txc.modes |= MOD_MAXERROR;
+		txc.maxerror = 0;
+	} else
 		txc.status = STA_UNSYNC;
 	if (adjtimex(&txc) == -1)
 		log_warn("ntp_adjtime (3) failed");
diff --git a/compat/adjfreq_netbsd.c b/compat/adjfreq_netbsd.c
index f533966..a07e358 100644
--- a/compat/adjfreq_netbsd.c
+++ b/compat/adjfreq_netbsd.c
@@ -69,7 +69,10 @@ update_time_sync_status(int synced)
 	struct timex txc = { 0 };
 
 	txc.modes = MOD_STATUS;
-	if (!synced)
+	if (synced) {
+		txc.modes |= MOD_MAXERROR;
+		txc.maxerror = 0;
+	} else
 		txc.status = STA_UNSYNC;
 	if (ntp_adjtime(&txc) == -1)
 		log_warn("ntp_adjtime (3) failed");
diff --git a/compat/adjfreq_solaris.c b/compat/adjfreq_solaris.c
index 8011dad..a1c0378 100644
--- a/compat/adjfreq_solaris.c
+++ b/compat/adjfreq_solaris.c
@@ -68,8 +68,16 @@ update_time_sync_status(int synced)
 	struct timex txc = { 0 };
 
 	txc.modes = MOD_STATUS;
-	if (!synced)
+	if (synced) {
+		txc.modes |= MOD_MAXERROR;
+		txc.maxerror = 0;
+	} else
 		txc.status = STA_UNSYNC;
+	/*
+	 * Cargo-cult MOD_TIMECONST value from chrony for a Solaris kernel
+	 * quirk. The kernel possibly always checks this constant.
+	 */
+	txc.constant = 10;
 	if (ntp_adjtime(&txc) == -1)
 		log_warn("ntp_adjtime (3) failed");
 	return;