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shared: allow negative timestamps for nm_utils_monotonic_timestamp_as_boottime()

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This commit is contained in:
Thomas Haller 2019-08-21 11:16:51 +02:00
parent 2f8a4e90f0
commit a7d8fe0ea5
1 changed files with 11 additions and 7 deletions
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18
shared/nm-glib-aux/nm-time-utils.c
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@ -234,12 +234,17 @@ nm_utils_get_monotonic_timestamp_s (void)
* @timestamp_ns_per_tick: How many nanoseconds make one unit of @timestamp? E.g. if
* @timestamp is in unit seconds, pass %NM_UTILS_NS_PER_SECOND; if @timestamp is
* in nanoseconds, pass 1; if @timestamp is in milliseconds, pass %NM_UTILS_NS_PER_SECOND/1000.
* This must be a multiple of 10, and between 1 and %NM_UTILS_NS_PER_SECOND.
*
* Returns: the monotonic-timestamp as CLOCK_BOOTTIME, as returned by clock_gettime().
* The unit is the same as the passed in @timestamp based on @timestamp_ns_per_tick.
* E.g. if you passed @timestamp in as seconds, it will return boottime in seconds.
* If @timestamp is non-positive, it returns -1. Note that a (valid) monotonic-timestamp
* is always positive.
*
* Note that valid monotonic-timestamps are always positive numbers (counting roughly since
* the application is running). However, it might make sense to calculate a timestamp from
* before the application was running, hence negative @timestamp is allowed. The result
* in that case might also be a negative timestamp (in CLOCK_BOOTTIME), which would indicate
* that the timestamp lies in the past before the machine was booted.
*
* On older kernels that don't support CLOCK_BOOTTIME, the returned time is instead CLOCK_MONOTONIC.
**/
@ -256,9 +261,6 @@ nm_utils_monotonic_timestamp_as_boottime (gint64 timestamp, gint64 timestamp_ns_
timestamp_ns_per_tick % 10 == 0),
-1);
/* Check that the timestamp is in a valid range. */
g_return_val_if_fail (timestamp >= 0, -1);
/* if the caller didn't yet ever fetch a monotonic-timestamp, he cannot pass any meaningful
* value (because he has no idea what these timestamps would be). That would be a bug. */
nm_assert (g_atomic_pointer_get (&p_global_state));
@ -270,8 +272,10 @@ nm_utils_monotonic_timestamp_as_boottime (gint64 timestamp, gint64 timestamp_ns_
/* calculate the offset of monotonic-timestamp to boottime. offset_s is <= 1. */
offset = p->offset_sec * (NM_UTILS_NS_PER_SECOND / timestamp_ns_per_tick);
/* check for overflow. */
g_return_val_if_fail (offset > 0 || timestamp < G_MAXINT64 + offset, G_MAXINT64);
nm_assert (offset <= 0 && offset > G_MININT64);
/* check for overflow (note that offset is non-positive). */
g_return_val_if_fail (timestamp < G_MAXINT64 + offset, G_MAXINT64);
return timestamp - offset;
}