projects / lttng-tools.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | } |