build-sys: split internal basic/ library from shared/

basic/      can be used by everything
            cannot use anything outside of basic/

libsystemd/ can use basic/
            cannot use shared/

shared/     can use libsystemd/

1 files changed, 55 insertions, 0 deletions

diff --git a/src/basic/ratelimit.c b/src/basic/ratelimit.c
new file mode 100644
index 0000000000..81fc9c19ff
--- /dev/null
+++ b/src/basic/ratelimit.c
@@ -0,0 +1,55 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  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 Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+
+#include "ratelimit.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 ts;
+
+        assert(r);
+
+        if (r->interval <= 0 || r->burst <= 0)
+                return true;
+
+        ts = now(CLOCK_MONOTONIC);
+
+        if (r->begin <= 0 ||
+            r->begin + r->interval < ts) {
+                r->begin = ts;
+
+                /* Reset counter */
+                r->num = 0;
+                goto good;
+        }
+
+        if (r->num < r->burst)
+                goto good;
+
+        return false;
+
+good:
+        r->num++;
+        return true;
+}