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 | ||
| 18 | #define _GNU_SOURCE | |
| 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" | |
| 25 | ||
| 26 | /* total count of fd. */ | |
| 27 | static long fd_count; | |
| 28 | ||
| 29 | /* | |
| 30 | * threshold in % of number of fd allowed. | |
| 31 | */ | |
| 32 | static long fd_threshold[LTTNG_FD_NR_TYPES] = { | |
| 33 | [LTTNG_FD_APPS] = 75, | |
| 34 | }; | |
| 35 | ||
| 36 | static rlim_t max_nr_fd; | |
| 37 | ||
| 38 | int lttng_fd_get(enum lttng_fd_type type, unsigned int nr) | |
| 39 | { | |
| 40 | long newval; | |
| 41 | ||
| 42 | if (type >= LTTNG_FD_NR_TYPES) { | |
| 43 | return -EINVAL; | |
| 44 | } | |
| 45 | ||
| 46 | newval = uatomic_add_return(&fd_count, (long) nr); | |
| 47 | if ((long) (newval * 100) | |
| 48 | - (long) (max_nr_fd * fd_threshold[type]) > 0) { | |
| 49 | uatomic_sub(&fd_count, (long) nr); | |
| 50 | return -EPERM; | |
| 51 | } | |
| 52 | return 0; | |
| 53 | } | |
| 54 | ||
| 55 | void lttng_fd_put(enum lttng_fd_type type, unsigned int nr) | |
| 56 | { | |
| 57 | uatomic_sub(&fd_count, (long) nr); | |
| 58 | } | |
| 59 | ||
| 60 | void lttng_fd_init(void) | |
| 61 | { | |
| 62 | struct rlimit rlim; | |
| 63 | int ret; | |
| 64 | ||
| 65 | ret = getrlimit(RLIMIT_NOFILE, &rlim); | |
| 66 | if (ret < 0) { | |
| 67 | perror("getrlimit"); | |
| 68 | } | |
| 69 | max_nr_fd = rlim.rlim_cur; | |
| 70 | } |