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1e2e8133 LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
2 | ||
a7334b09 LP |
3 | /*** |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
1e2e8133 LP |
22 | #include <assert.h> |
23 | ||
24 | #include "ratelimit.h" | |
25 | #include "log.h" | |
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) { | |
31 | usec_t timestamp; | |
32 | ||
33 | timestamp = now(CLOCK_MONOTONIC); | |
34 | ||
35 | assert(r); | |
36 | assert(r->interval > 0); | |
37 | assert(r->burst > 0); | |
38 | ||
39 | if (r->begin <= 0 || | |
40 | r->begin + r->interval < timestamp) { | |
41 | ||
42 | if (r->n_missed > 0) | |
43 | log_warning("%u events suppressed", r->n_missed); | |
44 | ||
45 | r->begin = timestamp; | |
46 | ||
47 | /* Reset counters */ | |
48 | r->n_printed = 0; | |
49 | r->n_missed = 0; | |
50 | goto good; | |
51 | } | |
52 | ||
53 | if (r->n_printed <= r->burst) | |
54 | goto good; | |
55 | ||
56 | r->n_missed++; | |
57 | return false; | |
58 | ||
59 | good: | |
60 | r->n_printed++; | |
61 | return true; | |
62 | } |