Add function to compare the current time with the time of the last
successful pmc update to determine if ptp4l is still responding.
Signed-off-by: Miroslav Lichvar <mlich...@redhat.com>
---
pmc_agent.c | 15 +++++++++++++++
pmc_agent.h | 8 ++++++++
2 files changed, 23 insertions(+)
diff --git a/pmc_agent.c b/pmc_agent.c
index 59f031d..9261c57 100644
--- a/pmc_agent.c
+++ b/pmc_agent.c
@@ -421,6 +421,21 @@ int pmc_agent_update(struct pmc_agent *node)
return 0;
}
+int pmc_agent_is_subscribed(struct pmc_agent *agent)
+{
+ struct timespec tp;
+ uint64_t ts;
+
+ if (clock_gettime(CLOCK_MONOTONIC, &tp)) {
+ pr_err("failed to read clock: %m");
+ return 0;
+ }
+ ts = tp.tv_sec * NS_PER_SEC + tp.tv_nsec;
+
+ return agent->pmc_last_update > 0 &&
+ ts - agent->pmc_last_update <= agent->subscribe_duration;
+}
+
bool pmc_agent_utc_offset_traceable(struct pmc_agent *agent)
{
return agent->utc_offset_traceable;
diff --git a/pmc_agent.h b/pmc_agent.h
index fa53f56..16be614 100644
--- a/pmc_agent.h
+++ b/pmc_agent.h
@@ -165,6 +165,14 @@ int pmc_agent_subscribe(struct pmc_agent *agent, int
timeout, int duration);
*/
int pmc_agent_update(struct pmc_agent *agent);
+/**
+ * Checks if last successful subscription did not run out, i.e. ptp4l is still
+ * responding (assuming pmc_agent_update() is called frequently enough).
+ * @param agent Pointer to a PMC instance obtained via @ref
pmc_agent_create().
+ * @return True if subscribed, false otherwise.
+ */
+int pmc_agent_is_subscribed(struct pmc_agent *agent);
+
/**
* Tests whether the current UTC offset is traceable.
* @param agent Pointer to a PMC instance obtained via @ref
pmc_agent_create().
--
2.41.0
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