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-rw-r--r--src/ratelimit.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/src/ratelimit.c b/src/ratelimit.c
new file mode 100644
index 0000000000..1e5ed03c55
--- /dev/null
+++ b/src/ratelimit.c
@@ -0,0 +1,62 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <assert.h>
+
+#include "ratelimit.h"
+#include "log.h"
+
+/* Modelled after Linux' lib/ratelimit.c by Dave Young
+ * <hidave.darkstar@gmail.com>, which is licensed GPLv2. */
+
+bool ratelimit_test(RateLimit *r) {
+ usec_t timestamp;
+
+ timestamp = now(CLOCK_MONOTONIC);
+
+ assert(r);
+ assert(r->interval > 0);
+ assert(r->burst > 0);
+
+ if (r->begin <= 0 ||
+ r->begin + r->interval < timestamp) {
+
+ if (r->n_missed > 0)
+ log_warning("%u events suppressed", r->n_missed);
+
+ r->begin = timestamp;
+
+ /* Reset counters */
+ r->n_printed = 0;
+ r->n_missed = 0;
+ goto good;
+ }
+
+ if (r->n_printed <= r->burst)
+ goto good;
+
+ r->n_missed++;
+ return false;
+
+good:
+ r->n_printed++;
+ return true;
+}