From a0fe71eef1cf7ce4dee77946cb7a8a0e4ee1c4f3 Mon Sep 17 00:00:00 2001
From: Chris Perl <cperl@janestreet.com>
Date: Tue, 10 Oct 2017 13:23:20 -0400
Subject: [PATCH] reference: add function to get TAI-UTC offset

---
 reference.c | 12 ++++++++++++
 reference.h |  3 +++
 2 files changed, 15 insertions(+)

diff --git a/reference.c b/reference.c
index 8138b8c..dff7ab9 100644
--- a/reference.c
+++ b/reference.c
@@ -1356,6 +1356,18 @@ int REF_IsLeapSecondClose(void)
 
 /* ================================================== */
 
+int
+REF_GetTaiOffset(struct timespec *ts)
+{
+  int tai_offset;
+
+  get_tz_leap(ts->tv_sec, &tai_offset);
+
+  return tai_offset;
+}
+
+/* ================================================== */
+
 void
 REF_GetTrackingReport(RPT_TrackingReport *rep)
 {
diff --git a/reference.h b/reference.h
index e376770..6ee4953 100644
--- a/reference.h
+++ b/reference.h
@@ -184,6 +184,9 @@ extern void REF_DisableLocal(void);
    and is better to discard any measurements */
 extern int REF_IsLeapSecondClose(void);
 
+/* Return TAI-UTC offset corresponding to a time in UTC if available */
+extern int REF_GetTaiOffset(struct timespec *ts);
+
 extern void REF_GetTrackingReport(RPT_TrackingReport *rep);
 
 #endif /* GOT_REFERENCE_H */