The SHM is not cleared upon servo release when exiting the tool. This leaves
the last update in the shared memory region marked as valid. As a result, the
NTP daemon starting later may consume stale data if the producer process
exited.
To prevent such behavior - invalidate the SHM data when releasing the SHM servo.
Signed-off-by: Maciek Machnikowski <mac...@machnikowski.net>
---
ntpshm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/ntpshm.c b/ntpshm.c
index 3b62a3f..6453ac4 100644
--- a/ntpshm.c
+++ b/ntpshm.c
@@ -69,6 +69,9 @@ static void ntpshm_destroy(struct servo *servo)
{
struct ntpshm_servo *s = container_of(servo, struct ntpshm_servo,
servo);
+ /* Invalidate the SHM data before exiting */
+ s->shm->valid = 0;
+
shmdt(s->shm);
free(s);
}
--
2.37.1 (Apple Git-137.1)
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