[lttng-tools.git] / src / common / evaluation.c

/*
 * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License, version 2.1 only,
 * as published by the Free Software Foundation.
 *
 * This library 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <lttng/condition/evaluation-internal.h>
#include <lttng/condition/buffer-usage-internal.h>
#include <common/macros.h>
#include <common/error.h>
#include <stdbool.h>
#include <assert.h>

LTTNG_HIDDEN
ssize_t lttng_evaluation_serialize(struct lttng_evaluation *evaluation,
		char *buf)
{
	ssize_t ret, offset = 0;
	struct lttng_evaluation_comm evaluation_comm;

	evaluation_comm.type = (int8_t) evaluation->type;
	if (buf) {
		memcpy(buf, &evaluation_comm, sizeof(evaluation_comm));
	}
	offset += sizeof(evaluation_comm);

	if (evaluation->serialize) {
		ret = evaluation->serialize(evaluation,
				buf ? (buf + offset) : NULL);
		if (ret < 0) {
			goto end;
		}
		offset += ret;
	}

	ret = offset;
end:
	return ret;
}

LTTNG_HIDDEN
ssize_t lttng_evaluation_create_from_buffer(const char *buf,
		struct lttng_evaluation **evaluation)
{
	ssize_t ret, evaluation_size = 0;
	struct lttng_evaluation_comm *evaluation_comm =
			(struct lttng_evaluation_comm *) buf;

	if (!buf || !evaluation) {
		ret = -1;
		goto end;
	}

	evaluation_size += sizeof(*evaluation_comm);
	buf += evaluation_size;

	switch ((enum lttng_condition_type) evaluation_comm->type) {
	case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
		ret = lttng_evaluation_buffer_usage_low_create_from_buffer(buf,
				evaluation);
		if (ret < 0) {
			goto end;
		}
		evaluation_size += ret;
		break;
	case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
		ret = lttng_evaluation_buffer_usage_high_create_from_buffer(buf,
				evaluation);
		if (ret < 0) {
			goto end;
		}
		evaluation_size += ret;
		break;
	default:
		ERR("Attempted to create evaluation of unknown type (%i)",
				(int) evaluation_comm->type);
		ret = -1;
		goto end;
	}
	ret = evaluation_size;
end:
	return ret;
}

enum lttng_condition_type lttng_evaluation_get_type(
		struct lttng_evaluation *evaluation)
{
	return evaluation ? evaluation->type : LTTNG_CONDITION_TYPE_UNKNOWN;
}

void lttng_evaluation_destroy(struct lttng_evaluation *evaluation)
{
	if (!evaluation) {
		return;
	}

	assert(evaluation->destroy);
	evaluation->destroy(evaluation);
}
Commit	Line	Data
fabb0b6c JG	1	/*
	2	* Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
	3	*
	4	* This library is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU Lesser General Public License, version 2.1 only,
	6	* as published by the Free Software Foundation.
	7	*
	8	* This library 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 Lesser General Public License
	11	* for more details.
	12	*
	13	* You should have received a copy of the GNU Lesser General Public License
	14	* along with this library; if not, write to the Free Software Foundation,
	15	* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	16	*/
	17
	18	#include <lttng/condition/evaluation-internal.h>
3c47cdaf	19	#include <lttng/condition/buffer-usage-internal.h>
fabb0b6c	20	#include <common/macros.h>
3c47cdaf	21	#include <common/error.h>
fabb0b6c JG	22	#include <stdbool.h>
	23	#include <assert.h>
	24
3c47cdaf JG	25	LTTNG_HIDDEN
	26	ssize_t lttng_evaluation_serialize(struct lttng_evaluation *evaluation,
	27	char *buf)
	28	{
	29	ssize_t ret, offset = 0;
	30	struct lttng_evaluation_comm evaluation_comm;
	31
	32	evaluation_comm.type = (int8_t) evaluation->type;
	33	if (buf) {
	34	memcpy(buf, &evaluation_comm, sizeof(evaluation_comm));
	35	}
	36	offset += sizeof(evaluation_comm);
	37
	38	if (evaluation->serialize) {
	39	ret = evaluation->serialize(evaluation,
	40	buf ? (buf + offset) : NULL);
	41	if (ret < 0) {
	42	goto end;
	43	}
	44	offset += ret;
	45	}
	46
	47	ret = offset;
	48	end:
	49	return ret;
	50	}
	51
	52	LTTNG_HIDDEN
	53	ssize_t lttng_evaluation_create_from_buffer(const char *buf,
	54	struct lttng_evaluation **evaluation)
	55	{
	56	ssize_t ret, evaluation_size = 0;
	57	struct lttng_evaluation_comm *evaluation_comm =
	58	(struct lttng_evaluation_comm *) buf;
	59
	60	if (!buf \|\| !evaluation) {
	61	ret = -1;
	62	goto end;
	63	}
	64
	65	evaluation_size += sizeof(*evaluation_comm);
	66	buf += evaluation_size;
	67
	68	switch ((enum lttng_condition_type) evaluation_comm->type) {
	69	case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
	70	ret = lttng_evaluation_buffer_usage_low_create_from_buffer(buf,
	71	evaluation);
	72	if (ret < 0) {
	73	goto end;
	74	}
	75	evaluation_size += ret;
	76	break;
	77	case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
	78	ret = lttng_evaluation_buffer_usage_high_create_from_buffer(buf,
	79	evaluation);
	80	if (ret < 0) {
	81	goto end;
	82	}
	83	evaluation_size += ret;
	84	break;
	85	default:
	86	ERR("Attempted to create evaluation of unknown type (%i)",
	87	(int) evaluation_comm->type);
	88	ret = -1;
89	goto end;
90	}
91	ret = evaluation_size;
92	end:
93	return ret;
94	}
95
fabb0b6c JG	96	enum lttng_condition_type lttng_evaluation_get_type(
	97	struct lttng_evaluation *evaluation)
	98	{
	99	return evaluation ? evaluation->type : LTTNG_CONDITION_TYPE_UNKNOWN;
	100	}
	101
	102	void lttng_evaluation_destroy(struct lttng_evaluation *evaluation)
	103	{
	104	if (!evaluation) {
	105	return;
	106	}
	107
	108	assert(evaluation->destroy);
	109	evaluation->destroy(evaluation);
	110	}