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-rw-r--r--src/libsystemd/libsystemd.sym1
-rw-r--r--src/libsystemd/sd-event/event-source.h1
-rw-r--r--src/libsystemd/sd-event/sd-event.c61
-rw-r--r--src/libsystemd/sd-event/test-event.c12
-rw-r--r--src/systemd/sd-event.h1
5 files changed, 68 insertions, 8 deletions
diff --git a/src/libsystemd/libsystemd.sym b/src/libsystemd/libsystemd.sym
index 5e2fc9e231..2178668d11 100644
--- a/src/libsystemd/libsystemd.sym
+++ b/src/libsystemd/libsystemd.sym
@@ -767,4 +767,5 @@ LIBSYSTEMD_250 {
global:
sd_device_get_diskseq;
sd_event_add_inotify_fd;
+ sd_event_source_set_ratelimit_expire_callback;
} LIBSYSTEMD_249;
diff --git a/src/libsystemd/sd-event/event-source.h b/src/libsystemd/sd-event/event-source.h
index 41845c0bb5..74cbc26962 100644
--- a/src/libsystemd/sd-event/event-source.h
+++ b/src/libsystemd/sd-event/event-source.h
@@ -71,6 +71,7 @@ struct sd_event_source {
uint64_t prepare_iteration;
sd_event_destroy_t destroy_callback;
+ sd_event_handler_t ratelimit_expire_callback;
LIST_FIELDS(sd_event_source, sources);
diff --git a/src/libsystemd/sd-event/sd-event.c b/src/libsystemd/sd-event/sd-event.c
index 0ca0248510..d8f84d9ba7 100644
--- a/src/libsystemd/sd-event/sd-event.c
+++ b/src/libsystemd/sd-event/sd-event.c
@@ -2908,7 +2908,7 @@ fail:
return r;
}
-static int event_source_leave_ratelimit(sd_event_source *s) {
+static int event_source_leave_ratelimit(sd_event_source *s, bool run_callback) {
int r;
assert(s);
@@ -2940,6 +2940,30 @@ static int event_source_leave_ratelimit(sd_event_source *s) {
ratelimit_reset(&s->rate_limit);
log_debug("Event source %p (%s) left rate limit state.", s, strna(s->description));
+
+ if (run_callback && s->ratelimit_expire_callback) {
+ s->dispatching = true;
+ r = s->ratelimit_expire_callback(s, s->userdata);
+ s->dispatching = false;
+
+ if (r < 0) {
+ log_debug_errno(r, "Ratelimit expiry callback of event source %s (type %s) returned error, %s: %m",
+ strna(s->description),
+ event_source_type_to_string(s->type),
+ s->exit_on_failure ? "exiting" : "disabling");
+
+ if (s->exit_on_failure)
+ (void) sd_event_exit(s->event, r);
+ }
+
+ if (s->n_ref == 0)
+ source_free(s);
+ else if (r < 0)
+ sd_event_source_set_enabled(s, SD_EVENT_OFF);
+
+ return 1;
+ }
+
return 0;
fail:
@@ -3139,6 +3163,7 @@ static int process_timer(
struct clock_data *d) {
sd_event_source *s;
+ bool callback_invoked = false;
int r;
assert(e);
@@ -3156,9 +3181,11 @@ static int process_timer(
* again. */
assert(s->ratelimited);
- r = event_source_leave_ratelimit(s);
+ r = event_source_leave_ratelimit(s, /* run_callback */ true);
if (r < 0)
return r;
+ else if (r == 1)
+ callback_invoked = true;
continue;
}
@@ -3173,7 +3200,7 @@ static int process_timer(
event_source_time_prioq_reshuffle(s);
}
- return 0;
+ return callback_invoked;
}
static int process_child(sd_event *e, int64_t threshold, int64_t *ret_min_priority) {
@@ -4097,15 +4124,15 @@ _public_ int sd_event_wait(sd_event *e, uint64_t timeout) {
if (r < 0)
goto finish;
- r = process_timer(e, e->timestamp.realtime, &e->realtime);
+ r = process_inotify(e);
if (r < 0)
goto finish;
- r = process_timer(e, e->timestamp.boottime, &e->boottime);
+ r = process_timer(e, e->timestamp.realtime, &e->realtime);
if (r < 0)
goto finish;
- r = process_timer(e, e->timestamp.monotonic, &e->monotonic);
+ r = process_timer(e, e->timestamp.boottime, &e->boottime);
if (r < 0)
goto finish;
@@ -4117,9 +4144,20 @@ _public_ int sd_event_wait(sd_event *e, uint64_t timeout) {
if (r < 0)
goto finish;
- r = process_inotify(e);
+ r = process_timer(e, e->timestamp.monotonic, &e->monotonic);
if (r < 0)
goto finish;
+ else if (r == 1) {
+ /* Ratelimit expiry callback was called. Let's postpone processing pending sources and
+ * put loop in the initial state in order to evaluate (in the next iteration) also sources
+ * there were potentially re-enabled by the callback.
+ *
+ * Wondering why we treat only this invocation of process_timer() differently? Once event
+ * source is ratelimited we essentially transform it into CLOCK_MONOTONIC timer hence
+ * ratelimit expiry callback is never called for any other timer type. */
+ r = 0;
+ goto finish;
+ }
if (event_next_pending(e)) {
e->state = SD_EVENT_PENDING;
@@ -4488,7 +4526,7 @@ _public_ int sd_event_source_set_ratelimit(sd_event_source *s, uint64_t interval
/* When ratelimiting is configured we'll always reset the rate limit state first and start fresh,
* non-ratelimited. */
- r = event_source_leave_ratelimit(s);
+ r = event_source_leave_ratelimit(s, /* run_callback */ false);
if (r < 0)
return r;
@@ -4496,6 +4534,13 @@ _public_ int sd_event_source_set_ratelimit(sd_event_source *s, uint64_t interval
return 0;
}
+_public_ int sd_event_source_set_ratelimit_expire_callback(sd_event_source *s, sd_event_handler_t callback) {
+ assert_return(s, -EINVAL);
+
+ s->ratelimit_expire_callback = callback;
+ return 0;
+}
+
_public_ int sd_event_source_get_ratelimit(sd_event_source *s, uint64_t *ret_interval, unsigned *ret_burst) {
assert_return(s, -EINVAL);
diff --git a/src/libsystemd/sd-event/test-event.c b/src/libsystemd/sd-event/test-event.c
index b637639f26..0ac23c1118 100644
--- a/src/libsystemd/sd-event/test-event.c
+++ b/src/libsystemd/sd-event/test-event.c
@@ -623,6 +623,11 @@ static int ratelimit_time_handler(sd_event_source *s, uint64_t usec, void *userd
return 0;
}
+static int expired = -1;
+static int ratelimit_expired(sd_event_source *s, void *userdata) {
+ return ++expired;
+}
+
static void test_ratelimit(void) {
_cleanup_close_pair_ int p[2] = {-1, -1};
_cleanup_(sd_event_unrefp) sd_event *e = NULL;
@@ -686,12 +691,19 @@ static void test_ratelimit(void) {
assert_se(sd_event_source_set_ratelimit(s, 1 * USEC_PER_SEC, 10) >= 0);
+ /* Set callback that will be invoked when we leave rate limited state. */
+ assert_se(sd_event_source_set_ratelimit_expire_callback(s, ratelimit_expired) >= 0);
+
do {
assert_se(sd_event_run(e, UINT64_MAX) >= 0);
} while (!sd_event_source_is_ratelimited(s));
log_info("ratelimit_time_handler: called 10 more times, event source got ratelimited");
assert_se(count == 20);
+
+ /* Dispatch the event loop once more and check that ratelimit expiration callback got called */
+ assert_se(sd_event_run(e, UINT64_MAX) >= 0);
+ assert_se(expired == 0);
}
static void test_simple_timeout(void) {
diff --git a/src/systemd/sd-event.h b/src/systemd/sd-event.h
index f4357aa593..63984eef15 100644
--- a/src/systemd/sd-event.h
+++ b/src/systemd/sd-event.h
@@ -166,6 +166,7 @@ int sd_event_source_set_exit_on_failure(sd_event_source *s, int b);
int sd_event_source_set_ratelimit(sd_event_source *s, uint64_t interval_usec, unsigned burst);
int sd_event_source_get_ratelimit(sd_event_source *s, uint64_t *ret_interval_usec, unsigned *ret_burst);
int sd_event_source_is_ratelimited(sd_event_source *s);
+int sd_event_source_set_ratelimit_expire_callback(sd_event_source *s, sd_event_handler_t callback);
/* Define helpers so that __attribute__((cleanup(sd_event_unrefp))) and similar may be used. */
_SD_DEFINE_POINTER_CLEANUP_FUNC(sd_event, sd_event_unref);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 05:57:05 +0100