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