b2c2df81585e34d943af6605d04d8633b084a277
[lttng-tools.git] / src / common / evaluation.c
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 <lttng/condition/session-consumed-size-internal.h>
21 #include <common/macros.h>
22 #include <common/error.h>
23 #include <stdbool.h>
24 #include <assert.h>
25
26 LTTNG_HIDDEN
27 ssize_t lttng_evaluation_serialize(struct lttng_evaluation *evaluation,
28 char *buf)
29 {
30 ssize_t ret, offset = 0;
31 struct lttng_evaluation_comm evaluation_comm = {
32 .type = (int8_t) evaluation->type
33 };
34
35 if (buf) {
36 memcpy(buf, &evaluation_comm, sizeof(evaluation_comm));
37 }
38 offset += sizeof(evaluation_comm);
39
40 if (evaluation->serialize) {
41 ret = evaluation->serialize(evaluation,
42 buf ? (buf + offset) : NULL);
43 if (ret < 0) {
44 goto end;
45 }
46 offset += ret;
47 }
48
49 ret = offset;
50 end:
51 return ret;
52 }
53
54 LTTNG_HIDDEN
55 ssize_t lttng_evaluation_create_from_buffer(
56 const struct lttng_buffer_view *src_view,
57 struct lttng_evaluation **evaluation)
58 {
59 ssize_t ret, evaluation_size = 0;
60 const struct lttng_evaluation_comm *evaluation_comm;
61 const struct lttng_buffer_view evaluation_view =
62 lttng_buffer_view_from_view(src_view,
63 sizeof(*evaluation_comm), -1);
64
65 if (!src_view || !evaluation) {
66 ret = -1;
67 goto end;
68 }
69
70 evaluation_comm = (const struct lttng_evaluation_comm *) src_view->data;
71 evaluation_size += sizeof(*evaluation_comm);
72
73 switch ((enum lttng_condition_type) evaluation_comm->type) {
74 case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
75 ret = lttng_evaluation_buffer_usage_low_create_from_buffer(
76 &evaluation_view, evaluation);
77 if (ret < 0) {
78 goto end;
79 }
80 evaluation_size += ret;
81 break;
82 case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
83 ret = lttng_evaluation_buffer_usage_high_create_from_buffer(
84 &evaluation_view, evaluation);
85 if (ret < 0) {
86 goto end;
87 }
88 evaluation_size += ret;
89 break;
90 case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE:
91 ret = lttng_evaluation_session_consumed_size_create_from_buffer(
92 &evaluation_view, evaluation);
93 if (ret < 0) {
94 goto end;
95 }
96 evaluation_size += ret;
97 break;
98 default:
99 ERR("Attempted to create evaluation of unknown type (%i)",
100 (int) evaluation_comm->type);
101 ret = -1;
102 goto end;
103 }
104 ret = evaluation_size;
105 end:
106 return ret;
107 }
108
109 enum lttng_condition_type lttng_evaluation_get_type(
110 const struct lttng_evaluation *evaluation)
111 {
112 return evaluation ? evaluation->type : LTTNG_CONDITION_TYPE_UNKNOWN;
113 }
114
115 void lttng_evaluation_destroy(struct lttng_evaluation *evaluation)
116 {
117 if (!evaluation) {
118 return;
119 }
120
121 assert(evaluation->destroy);
122 evaluation->destroy(evaluation);
123 }
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