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4063050c MD |
1 | /* |
2 | * Copyright (C) 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along | |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
6c1c0768 | 18 | #define _LGPL_SOURCE |
4063050c MD |
19 | #include <urcu/uatomic.h> |
20 | #include <sys/time.h> | |
21 | #include <sys/resource.h> | |
22 | #include <errno.h> | |
23 | #include <stdio.h> | |
24 | #include "fd-limit.h" | |
6f04ed72 | 25 | #include <common/error.h> |
4063050c MD |
26 | |
27 | /* total count of fd. */ | |
28 | static long fd_count; | |
29 | ||
30 | /* | |
31 | * threshold in % of number of fd allowed. | |
32 | */ | |
33 | static long fd_threshold[LTTNG_FD_NR_TYPES] = { | |
34 | [LTTNG_FD_APPS] = 75, | |
35 | }; | |
36 | ||
37 | static rlim_t max_nr_fd; | |
38 | ||
39 | int lttng_fd_get(enum lttng_fd_type type, unsigned int nr) | |
40 | { | |
41 | long newval; | |
42 | ||
43 | if (type >= LTTNG_FD_NR_TYPES) { | |
44 | return -EINVAL; | |
45 | } | |
46 | ||
47 | newval = uatomic_add_return(&fd_count, (long) nr); | |
48 | if ((long) (newval * 100) | |
49 | - (long) (max_nr_fd * fd_threshold[type]) > 0) { | |
50 | uatomic_sub(&fd_count, (long) nr); | |
51 | return -EPERM; | |
52 | } | |
53 | return 0; | |
54 | } | |
55 | ||
56 | void lttng_fd_put(enum lttng_fd_type type, unsigned int nr) | |
57 | { | |
58 | uatomic_sub(&fd_count, (long) nr); | |
59 | } | |
60 | ||
61 | void lttng_fd_init(void) | |
62 | { | |
63 | struct rlimit rlim; | |
64 | int ret; | |
65 | ||
66 | ret = getrlimit(RLIMIT_NOFILE, &rlim); | |
67 | if (ret < 0) { | |
6f04ed72 | 68 | PERROR("getrlimit"); |
4063050c MD |
69 | } |
70 | max_nr_fd = rlim.rlim_cur; | |
71 | } |