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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
a7334b09 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
8 | under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
a7334b09 LP |
10 | (at your option) any later version. |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 15 | Lesser General Public License for more details. |
a7334b09 | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
20 | ||
1e2e8133 | 21 | |
11c3a366 TA |
22 | #include <sys/time.h> |
23 | ||
11c3a366 | 24 | #include "macro.h" |
93cc7779 | 25 | #include "ratelimit.h" |
1e2e8133 LP |
26 | |
27 | /* Modelled after Linux' lib/ratelimit.c by Dave Young | |
28 | * <hidave.darkstar@gmail.com>, which is licensed GPLv2. */ | |
29 | ||
30 | bool ratelimit_test(RateLimit *r) { | |
871d7de4 | 31 | usec_t ts; |
1e2e8133 | 32 | |
1e2e8133 | 33 | assert(r); |
cafac610 LP |
34 | |
35 | if (r->interval <= 0 || r->burst <= 0) | |
36 | return true; | |
37 | ||
38 | ts = now(CLOCK_MONOTONIC); | |
1e2e8133 LP |
39 | |
40 | if (r->begin <= 0 || | |
871d7de4 | 41 | r->begin + r->interval < ts) { |
871d7de4 | 42 | r->begin = ts; |
1e2e8133 | 43 | |
4ce9faa9 HH |
44 | /* Reset counter */ |
45 | r->num = 0; | |
1e2e8133 LP |
46 | goto good; |
47 | } | |
48 | ||
1c008326 | 49 | if (r->num < r->burst) |
1e2e8133 LP |
50 | goto good; |
51 | ||
1e2e8133 LP |
52 | return false; |
53 | ||
54 | good: | |
4ce9faa9 | 55 | r->num++; |
1e2e8133 LP |
56 | return true; |
57 | } |