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[systemd.git] / src / basic / ratelimit.c
1 /***
2 This file is part of systemd.
3
4 Copyright 2010 Lennart Poettering
5
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20
21 #include <sys/time.h>
22
23 #include "macro.h"
24 #include "ratelimit.h"
25
26 /* Modelled after Linux' lib/ratelimit.c by Dave Young
27 * <hidave.darkstar@gmail.com>, which is licensed GPLv2. */
28
29 bool ratelimit_test(RateLimit *r) {
30 usec_t ts;
31
32 assert(r);
33
34 if (r->interval <= 0 || r->burst <= 0)
35 return true;
36
37 ts = now(CLOCK_MONOTONIC);
38
39 if (r->begin <= 0 ||
40 r->begin + r->interval < ts) {
41 r->begin = ts;
42
43 /* Reset counter */
44 r->num = 0;
45 goto good;
46 }
47
48 if (r->num < r->burst)
49 goto good;
50
51 return false;
52
53 good:
54 r->num++;
55 return true;
56 }