From a0598047e4bfd308a25b9a516529ab49074fa527 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 11 Nov 2013 03:03:17 +0100
Subject: [PATCH] timer: consider (usec_t) -1 an invalid timestamp

---
 src/shared/time-util.c | 4 ++--
 src/shared/time-util.h | 5 ++++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/shared/time-util.c b/src/shared/time-util.c
index b8a6bd7..81d4ede 100644
--- a/src/shared/time-util.c
+++ b/src/shared/time-util.c
@@ -157,7 +157,7 @@ char *format_timestamp(char *buf, size_t l, usec_t t) {
         assert(buf);
         assert(l > 0);
 
-        if (t <= 0)
+        if (t <= 0 || t == (usec_t) -1)
                 return NULL;
 
         sec = (time_t) (t / USEC_PER_SEC);
@@ -175,7 +175,7 @@ char *format_timestamp_us(char *buf, size_t l, usec_t t) {
         assert(buf);
         assert(l > 0);
 
-        if (t <= 0)
+        if (t <= 0 || t == (usec_t) -1)
                 return NULL;
 
         sec = (time_t) (t / USEC_PER_SEC);
diff --git a/src/shared/time-util.h b/src/shared/time-util.h
index 7660fe1..bc10d22 100644
--- a/src/shared/time-util.h
+++ b/src/shared/time-util.h
@@ -64,7 +64,10 @@ dual_timestamp* dual_timestamp_get(dual_timestamp *ts);
 dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u);
 dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u);
 
-#define dual_timestamp_is_set(ts) ((ts)->realtime > 0)
+static inline bool dual_timestamp_is_set(dual_timestamp *ts) {
+        return ((ts->realtime > 0 && ts->realtime != (usec_t) -1) ||
+                (ts->monotonic > 0 && ts->monotonic != (usec_t) -1));
+}
 
 usec_t timespec_load(const struct timespec *ts) _pure_;
 struct timespec *timespec_store(struct timespec *ts, usec_t u);