sd-event: permit a USEC_INFINITY timeout as an alternative to a disabling an event...

This should simplify handling of time events in clients and is in-line with the USEC_INFINITY macro we already have.
This way setting a timeout to 0 indicates "elapse immediately", and a timeout of USEC_INFINITY "elapse never".

diff --git a/src/libelogind/sd-event/sd-event.c b/src/libelogind/sd-event/sd-event.c
index 63a64f339282d4fc2442454d246055ccd040738a..b14e859c7806abe764da59c0b43961f605099708 100644 (file)
--- a/src/libelogind/sd-event/sd-event.c
+++ b/src/libelogind/sd-event/sd-event.c
@@ -1068,7 +1068,6 @@ _public_ int sd_event_add_time(
         int r;
 
         assert_return(e, -EINVAL);
-        assert_return(usec != (uint64_t) -1, -EINVAL);
         assert_return(accuracy != (uint64_t) -1, -EINVAL);
         assert_return(e->state != SD_EVENT_FINISHED, -ESTALE);
         assert_return(!event_pid_changed(e), -ECHILD);
@@ -1770,7 +1769,6 @@ _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) {
         struct clock_data *d;
 
         assert_return(s, -EINVAL);
-        assert_return(usec != (uint64_t) -1, -EINVAL);
         assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM);
         assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE);
         assert_return(!event_pid_changed(s->event), -ECHILD);
@@ -1904,6 +1902,8 @@ static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) {
 
         if (a <= 0)
                 return 0;
+        if (a >= USEC_INFINITY)
+                return USEC_INFINITY;
 
         if (b <= a + 1)
                 return a;
@@ -1993,7 +1993,7 @@ static int event_arm_timer(
                 d->needs_rearm = false;
 
         a = prioq_peek(d->earliest);
-        if (!a || a->enabled == SD_EVENT_OFF) {
+        if (!a || a->enabled == SD_EVENT_OFF || a->time.next == USEC_INFINITY) {
 
                 if (d->fd < 0)
                         return 0;