[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 struct lttng_buffer_view *src_view,
		struct lttng_evaluation **evaluation)
{
	ssize_t ret, evaluation_size = 0;
	const struct lttng_evaluation_comm *evaluation_comm;
	const struct lttng_buffer_view evaluation_view =
			lttng_buffer_view_from_view(src_view,
			sizeof(*evaluation_comm), -1);

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

	evaluation_comm = (const struct lttng_evaluation_comm *) src_view->data;
	evaluation_size += sizeof(*evaluation_comm);

	switch ((enum lttng_condition_type) evaluation_comm->type) {
	case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
		ret = lttng_evaluation_buffer_usage_low_create_from_buffer(
				&evaluation_view, 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(
				&evaluation_view, 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(
		const 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
a58c490f 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>
	19	#include <lttng/condition/buffer-usage-internal.h>
	20	#include <common/macros.h>
	21	#include <common/error.h>
	22	#include <stdbool.h>
	23	#include <assert.h>
	24
	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(
	54	const struct lttng_buffer_view *src_view,
	55	struct lttng_evaluation **evaluation)
	56	{
	57	ssize_t ret, evaluation_size = 0;
	58	const struct lttng_evaluation_comm *evaluation_comm;
	59	const struct lttng_buffer_view evaluation_view =
	60	lttng_buffer_view_from_view(src_view,
	61	sizeof(*evaluation_comm), -1);
	62
	63	if (!src_view \|\| !evaluation) {
	64	ret = -1;
65	goto end;
66	}
67
68	evaluation_comm = (const struct lttng_evaluation_comm *) src_view->data;
69	evaluation_size += sizeof(*evaluation_comm);
70
71	switch ((enum lttng_condition_type) evaluation_comm->type) {
72	case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
73	ret = lttng_evaluation_buffer_usage_low_create_from_buffer(
74	&evaluation_view, evaluation);
75	if (ret < 0) {
76	goto end;
77	}
78	evaluation_size += ret;
79	break;
80	case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
81	ret = lttng_evaluation_buffer_usage_high_create_from_buffer(
82	&evaluation_view, evaluation);
83	if (ret < 0) {
84	goto end;
85	}
86	evaluation_size += ret;
87	break;
88	default:
89	ERR("Attempted to create evaluation of unknown type (%i)",
90	(int) evaluation_comm->type);
91	ret = -1;
92	goto end;
93	}
94	ret = evaluation_size;
95	end:
96	return ret;
97	}
98
99	enum lttng_condition_type lttng_evaluation_get_type(
100	const struct lttng_evaluation *evaluation)
101	{
102	return evaluation ? evaluation->type : LTTNG_CONDITION_TYPE_UNKNOWN;
103	}
104
105	void lttng_evaluation_destroy(struct lttng_evaluation *evaluation)
106	{
107	if (!evaluation) {
108	return;
109	}
110
111	assert(evaluation->destroy);
112	evaluation->destroy(evaluation);
113	}