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From eaae0683686ccd07d1cf79f2247032586162f854 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Mon, 11 Nov 2013 03:03:17 +0100
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Subject: [PATCH] timer: consider (usec_t) -1 an invalid timestamp
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---
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 src/shared/time-util.c | 4 ++--
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 src/shared/time-util.h | 5 ++++-
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 2 files changed, 6 insertions(+), 3 deletions(-)
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diff --git a/src/shared/time-util.c b/src/shared/time-util.c
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index b8a6bd7..81d4ede 100644
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--- a/src/shared/time-util.c
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+++ b/src/shared/time-util.c
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@@ -157,7 +157,7 @@ char *format_timestamp(char *buf, size_t l, usec_t t) {
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         assert(buf);
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         assert(l > 0);
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-        if (t <= 0)
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+        if (t <= 0 || t == (usec_t) -1)
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                 return NULL;
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         sec = (time_t) (t / USEC_PER_SEC);
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@@ -175,7 +175,7 @@ char *format_timestamp_us(char *buf, size_t l, usec_t t) {
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         assert(buf);
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         assert(l > 0);
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-        if (t <= 0)
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+        if (t <= 0 || t == (usec_t) -1)
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                 return NULL;
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         sec = (time_t) (t / USEC_PER_SEC);
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diff --git a/src/shared/time-util.h b/src/shared/time-util.h
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index 7660fe1..bc10d22 100644
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--- a/src/shared/time-util.h
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+++ b/src/shared/time-util.h
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@@ -64,7 +64,10 @@ dual_timestamp* dual_timestamp_get(dual_timestamp *ts);
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 dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u);
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 dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u);
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-#define dual_timestamp_is_set(ts) ((ts)->realtime > 0)
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+static inline bool dual_timestamp_is_set(dual_timestamp *ts) {
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+        return ((ts->realtime > 0 && ts->realtime != (usec_t) -1) ||
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+                (ts->monotonic > 0 && ts->monotonic != (usec_t) -1));
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+}
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 usec_t timespec_load(const struct timespec *ts) _pure_;
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 struct timespec *timespec_store(struct timespec *ts, usec_t u);