usec_t timeval_load(const struct timeval *tv) _pure_;
struct timeval *timeval_store(struct timeval *tv, usec_t u);
-nsec_t timespec_load_nsec(const struct timespec *ts) _pure_;
-
char *format_timestamp(char *buf, size_t l, usec_t t);
#if 0 /// UNNEEDED by elogind
char *format_timestamp_utc(char *buf, size_t l, usec_t t);
#if 0 /// UNNEEDED by elogind
void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t);
int dual_timestamp_deserialize(const char *value, dual_timestamp *t);
+#endif // 0
+int timestamp_deserialize(const char *value, usec_t *timestamp);
+#if 0 /// UNNEEDED by elogind
int parse_timestamp(const char *t, usec_t *usec);
#endif // 0
int get_timezones(char ***l);
bool timezone_is_valid(const char *name);
+#endif // 0
+bool clock_boottime_supported(void);
+#if 0 /// UNNEEDED by elogind
clockid_t clock_boottime_or_monotonic(void);
#endif // 0
#if 0 /// UNNEEDED by elogind
unsigned long usec_to_jiffies(usec_t usec);
#endif // 0
+
+static inline usec_t usec_add(usec_t a, usec_t b) {
+ usec_t c;
+
+ /* Adds two time values, and makes sure USEC_INFINITY as input results as USEC_INFINITY in output, and doesn't
+ * overflow. */
+
+ c = a + b;
+ if (c < a || c < b) /* overflow check */
+ return USEC_INFINITY;
+
+ return c;
+}
+
+static inline usec_t usec_sub(usec_t timestamp, int64_t delta) {
+ if (delta < 0)
+ return usec_add(timestamp, (usec_t) (-delta));
+
+ if (timestamp == USEC_INFINITY) /* Make sure infinity doesn't degrade */
+ return USEC_INFINITY;
+
+ if (timestamp < (usec_t) delta)
+ return 0;
+
+ return timestamp - delta;
+}