---
util.c | 14 ++++++++++++++
util.h | 18 ++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/util.c b/util.c
index 6bbbe91..e10cedc 100644
--- a/util.c
+++ b/util.c
@@ -512,3 +512,17 @@ void parray_extend(void ***a, ...)
va_end(ap);
(*a)[len - 1] = NULL;
}
+
+int rate_limited(int interval, time_t *last)
+{
+ struct timespec ts;
+
+ if (clock_gettime(CLOCK_MONOTONIC, &ts))
+ return 1;
+ if (*last + interval > ts.tv_sec)
+ return 1;
+
+ *last = ts.tv_sec;
+
+ return 0;
+}
diff --git a/util.h b/util.h
index cc521b6..8ce2470 100644
--- a/util.h
+++ b/util.h
@@ -354,4 +354,22 @@ void parray_append(void ***a, void *p);
*/
void parray_extend(void ***a, ...);
+/**
+ * Check if enough time has passed to implement a simple rate limiting.
+ *
+ * @param interval Minimum interval between two calls returning 0 (in
seconds).
+ * @param last Time of the last call that returned 0, input/output.
+ * @return 1 when rate limited, 0 otherwise.
+ */
+int rate_limited(int interval, time_t *last);
+
+/* Convenient wrapper to limit the rate of some code */
+#define LIMIT_RATE(i, x...) \
+ do { \
+ static time_t last = -i; \
+ if (!rate_limited(i, &last)) { \
+ x; \
+ } \
+ } while (0);
+
#endif
--
2.1.0
------------------------------------------------------------------------------
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