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8b3bd7a3 SM |
1 | /* |
2 | * Copyright (C) 2012 - Simon Marchi <simon.marchi@polymtl.ca> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #include <stddef.h> | |
19 | #include <unistd.h> | |
20 | ||
21 | #include "defaults.h" | |
22 | #include "macros.h" | |
23 | ||
24 | size_t default_channel_subbuf_size; | |
25 | size_t default_metadata_subbuf_size; | |
26 | size_t default_kernel_channel_subbuf_size; | |
27 | size_t default_ust_channel_subbuf_size; | |
28 | ||
29 | static void __attribute__((constructor)) init_defaults(void) | |
30 | { | |
31 | /* | |
32 | * The libringbuffer won't accept subbuf sizes smaller than the page size. | |
33 | * If the default subbuf size is smaller, replace it by the page size. | |
34 | */ | |
35 | long page_size = sysconf(_SC_PAGESIZE); | |
36 | ||
37 | if (page_size < 0) { | |
38 | page_size = 0; | |
39 | } | |
40 | ||
41 | default_channel_subbuf_size = | |
42 | max(DEFAULT_CHANNEL_SUBBUF_SIZE, page_size); | |
43 | default_metadata_subbuf_size = | |
44 | max(DEFAULT_METADATA_SUBBUF_SIZE, page_size); | |
45 | default_kernel_channel_subbuf_size = | |
46 | max(DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE, page_size); | |
47 | default_ust_channel_subbuf_size = | |
48 | max(DEFAULT_UST_CHANNEL_SUBBUF_SIZE, page_size); | |
49 | } |