[lttng-tools.git] / include / lttng-share.h

/*
 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
 *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; only version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifndef _LTTNG_SHARE_H
#define _LTTNG_SHARE_H

#include <stdlib.h>

/* Default channel attributes */
#define DEFAULT_CHANNEL_NAME            "channel0"
#define DEFAULT_CHANNEL_OVERWRITE       0       /* usec */
/* DEFAULT_CHANNEL_SUBBUF_SIZE must always be a power of 2 */
#define DEFAULT_CHANNEL_SUBBUF_SIZE     4096    /* bytes */
/* DEFAULT_CHANNEL_SUBBUF_NUM must always be a power of 2 */
#define DEFAULT_CHANNEL_SUBBUF_NUM      8
#define DEFAULT_CHANNEL_SWITCH_TIMER    0       /* usec */
#define DEFAULT_CHANNEL_READ_TIMER		200     /* usec */
#define DEFAULT_CHANNEL_OUTPUT          LTTNG_EVENT_MMAP

#define DEFAULT_METADATA_SUBBUF_SIZE    4096
#define DEFAULT_METADATA_SUBBUF_NUM     2

/* Kernel has different defaults */

/* DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE must always be a power of 2 */
#define DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE  262144    /* bytes */
/* DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM must always be a power of 2 */
#define DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM   4
/* See lttng-kernel.h enum lttng_kernel_output for channel output */
#define DEFAULT_KERNEL_CHANNEL_OUTPUT       LTTNG_EVENT_SPLICE

/* User space defaults */

/* Must be a power of 2 */
#define DEFAULT_UST_CHANNEL_SUBBUF_SIZE     4096    /* bytes */
/* Must be a power of 2 */
#define DEFAULT_UST_CHANNEL_SUBBUF_NUM      4

/*
 * Takes a pointer x and transform it so we can use it to access members
 * without a function call. Here an example:
 *
 *    #define GET_SIZE(x) LTTNG_REF(x)->size
 *
 *    struct { int size; } s;
 *
 *    printf("size : %d\n", GET_SIZE(&s));
 *
 * For this example we can't use something like this for compatibility purpose
 * since this will fail:
 *
 *    #define GET_SIZE(x) x->size;
 *
 * This is mostly use for the compatibility layer of lttng-tools. See
 * poll/epoll for a good example. Since x can be on the stack or allocated
 * memory using malloc(), we must use generic accessors for compat in order to
 * *not* use a function to access members and not the variable name.
 */
#define LTTNG_REF(x) ((typeof(*x) *)(x))

/*
 * Memory allocation zeroed
 */
#define zmalloc(x) calloc(1, x)

#ifndef ARRAY_SIZE
#define ARRAY_SIZE(array)   (sizeof(array) / (sizeof((array)[0])))
#endif


#endif /* _LTTNG_SHARE_H */
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
	3	* Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	4	*
	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.
	8	*
	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.
	13	*
	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.
	17	*/
	18
	19	#ifndef _LTTNG_SHARE_H
	20	#define _LTTNG_SHARE_H
	21
	22	#include <stdlib.h>
	23
	24	/* Default channel attributes */
	25	#define DEFAULT_CHANNEL_NAME "channel0"
	26	#define DEFAULT_CHANNEL_OVERWRITE 0 /* usec */
	27	/* DEFAULT_CHANNEL_SUBBUF_SIZE must always be a power of 2 */
	28	#define DEFAULT_CHANNEL_SUBBUF_SIZE 4096 /* bytes */
	29	/* DEFAULT_CHANNEL_SUBBUF_NUM must always be a power of 2 */
	30	#define DEFAULT_CHANNEL_SUBBUF_NUM 8
	31	#define DEFAULT_CHANNEL_SWITCH_TIMER 0 /* usec */
	32	#define DEFAULT_CHANNEL_READ_TIMER 200 /* usec */
	33	#define DEFAULT_CHANNEL_OUTPUT LTTNG_EVENT_MMAP
	34
	35	#define DEFAULT_METADATA_SUBBUF_SIZE 4096
	36	#define DEFAULT_METADATA_SUBBUF_NUM 2
	37
	38	/* Kernel has different defaults */
	39
	40	/* DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE must always be a power of 2 */
	41	#define DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE 262144 /* bytes */
	42	/* DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM must always be a power of 2 */
	43	#define DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM 4
	44	/* See lttng-kernel.h enum lttng_kernel_output for channel output */
	45	#define DEFAULT_KERNEL_CHANNEL_OUTPUT LTTNG_EVENT_SPLICE
	46
	47	/* User space defaults */
	48
	49	/* Must be a power of 2 */
	50	#define DEFAULT_UST_CHANNEL_SUBBUF_SIZE 4096 /* bytes */
	51	/* Must be a power of 2 */
	52	#define DEFAULT_UST_CHANNEL_SUBBUF_NUM 4
	53
	54	/*
	55	* Takes a pointer x and transform it so we can use it to access members
	56	* without a function call. Here an example:
	57	*
	58	* #define GET_SIZE(x) LTTNG_REF(x)->size
	59	*
	60	* struct { int size; } s;
	61	*
	62	* printf("size : %d\n", GET_SIZE(&s));
	63	*
	64	* For this example we can't use something like this for compatibility purpose
	65	* since this will fail:
	66	*
	67	* #define GET_SIZE(x) x->size;
	68	*
	69	* This is mostly use for the compatibility layer of lttng-tools. See
	70	* poll/epoll for a good example. Since x can be on the stack or allocated
	71	* memory using malloc(), we must use generic accessors for compat in order to
	72	* not use a function to access members and not the variable name.
	73	*/
	74	#define LTTNG_REF(x) ((typeof(x) )(x))
	75
	76	/*
	77	* Memory allocation zeroed
	78	*/
	79	#define zmalloc(x) calloc(1, x)
	80
	81	#ifndef ARRAY_SIZE
	82	#define ARRAY_SIZE(array) (sizeof(array) / (sizeof((array)[0])))
	83	#endif
	84
	85
	86	#endif /* _LTTNG_SHARE_H */