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9bda164d | 1 | /* |
e848fc76 DG |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
9bda164d | 4 | * |
e848fc76 DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
9bda164d | 8 | * |
e848fc76 DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
9bda164d | 13 | * |
e848fc76 DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
9bda164d DG |
17 | */ |
18 | ||
19 | #ifndef _LTTNG_SHARE_H | |
20 | #define _LTTNG_SHARE_H | |
21 | ||
e848fc76 DG |
22 | #include <stdlib.h> |
23 | ||
f3ed775e | 24 | /* Default channel attributes */ |
3817e7df DG |
25 | #define DEFAULT_CHANNEL_NAME "channel0" |
26 | #define DEFAULT_CHANNEL_OVERWRITE 0 /* usec */ | |
7d452e12 | 27 | /* DEFAULT_CHANNEL_SUBBUF_SIZE must always be a power of 2 */ |
3817e7df | 28 | #define DEFAULT_CHANNEL_SUBBUF_SIZE 4096 /* bytes */ |
7d452e12 | 29 | /* DEFAULT_CHANNEL_SUBBUF_NUM must always be a power of 2 */ |
3817e7df DG |
30 | #define DEFAULT_CHANNEL_SUBBUF_NUM 8 |
31 | #define DEFAULT_CHANNEL_SWITCH_TIMER 0 /* usec */ | |
b389abbe | 32 | #define DEFAULT_CHANNEL_READ_TIMER 200 /* usec */ |
3817e7df | 33 | #define DEFAULT_CHANNEL_OUTPUT LTTNG_EVENT_MMAP |
b389abbe | 34 | |
3817e7df DG |
35 | #define DEFAULT_METADATA_SUBBUF_SIZE 4096 |
36 | #define DEFAULT_METADATA_SUBBUF_NUM 2 | |
e6ddca71 | 37 | |
b389abbe MD |
38 | /* Kernel has different defaults */ |
39 | ||
40 | /* DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE must always be a power of 2 */ | |
3817e7df | 41 | #define DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE 262144 /* bytes */ |
b389abbe | 42 | /* DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM must always be a power of 2 */ |
3817e7df | 43 | #define DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM 4 |
b389abbe | 44 | /* See lttng-kernel.h enum lttng_kernel_output for channel output */ |
3817e7df | 45 | #define DEFAULT_KERNEL_CHANNEL_OUTPUT LTTNG_EVENT_SPLICE |
f3ed775e | 46 | |
5eb91c98 DG |
47 | /* |
48 | * Takes a pointer x and transform it so we can use it to access members | |
49 | * without a function call. Here an example: | |
50 | * | |
51 | * #define GET_SIZE(x) LTTNG_REF(x)->size | |
52 | * | |
53 | * struct { int size; } s; | |
54 | * | |
55 | * printf("size : %d\n", GET_SIZE(&s)); | |
56 | * | |
57 | * For this example we can't use something like this for compatibility purpose | |
58 | * since this will fail: | |
59 | * | |
60 | * #define GET_SIZE(x) x->size; | |
61 | * | |
62 | * This is mostly use for the compatibility layer of lttng-tools. See | |
e848fc76 | 63 | * poll/epoll for a good example. Since x can be on the stack or allocated |
5eb91c98 | 64 | * memory using malloc(), we must use generic accessors for compat in order to |
e848fc76 | 65 | * *not* use a function to access members and not the variable name. |
5eb91c98 DG |
66 | */ |
67 | #define LTTNG_REF(x) ((typeof(*x) *)(x)) | |
68 | ||
69 | /* | |
70 | * Memory allocation zeroed | |
71 | */ | |
72 | #define zmalloc(x) calloc(1, x) | |
73 | ||
e848fc76 DG |
74 | #ifndef ARRAY_SIZE |
75 | #define ARRAY_SIZE(array) (sizeof(array) / (sizeof((array)[0]))) | |
76 | #endif | |
77 | ||
78 | ||
9bda164d | 79 | #endif /* _LTTNG_SHARE_H */ |