Session consumed size notification
[lttng-tools.git] / src / common / condition.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/condition-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 <common/dynamic-buffer.h>
24 #include <common/buffer-view.h>
25 #include <stdbool.h>
26 #include <assert.h>
27
28 enum lttng_condition_type lttng_condition_get_type(
29 const struct lttng_condition *condition)
30 {
31 return condition ? condition->type : LTTNG_CONDITION_TYPE_UNKNOWN;
32 }
33
34 void lttng_condition_destroy(struct lttng_condition *condition)
35 {
36 if (!condition) {
37 return;
38 }
39
40 assert(condition->destroy);
41 condition->destroy(condition);
42 }
43
44 LTTNG_HIDDEN
45 bool lttng_condition_validate(const struct lttng_condition *condition)
46 {
47 bool valid;
48
49 if (!condition) {
50 valid = false;
51 goto end;
52 }
53
54 if (!condition->validate) {
55 /* Sub-class guarantees that it can never be invalid. */
56 valid = true;
57 goto end;
58 }
59
60 valid = condition->validate(condition);
61 end:
62 return valid;
63 }
64
65 LTTNG_HIDDEN
66 ssize_t lttng_condition_serialize(const struct lttng_condition *condition,
67 char *buf)
68 {
69 ssize_t ret, condition_size;
70 struct lttng_condition_comm condition_comm = {
71 .condition_type = (int8_t) (condition ?
72 condition->type : LTTNG_CONDITION_TYPE_UNKNOWN)
73 };
74
75 if (!condition) {
76 ret = -1;
77 goto end;
78 }
79
80 ret = sizeof(struct lttng_condition_comm);
81 if (buf) {
82 memcpy(buf, &condition_comm, ret);
83 buf += ret;
84 }
85
86 condition_size = condition->serialize(condition, buf);
87 if (condition_size < 0) {
88 ret = condition_size;
89 goto end;
90 }
91 ret += condition_size;
92 end:
93 return ret;
94 }
95
96 LTTNG_HIDDEN
97 bool lttng_condition_is_equal(const struct lttng_condition *a,
98 const struct lttng_condition *b)
99 {
100 bool is_equal = false;
101
102 if (!a || !b) {
103 goto end;
104 }
105
106 if (a->type != b->type) {
107 goto end;
108 }
109
110 is_equal = a->equal ? a->equal(a, b) : true;
111 end:
112 return is_equal;
113 }
114
115 LTTNG_HIDDEN
116 ssize_t lttng_condition_create_from_buffer(
117 const struct lttng_buffer_view *buffer,
118 struct lttng_condition **condition)
119 {
120 ssize_t ret, condition_size = 0;
121 const struct lttng_condition_comm *condition_comm;
122 condition_create_from_buffer_cb create_from_buffer = NULL;
123
124 if (!buffer || !condition) {
125 ret = -1;
126 goto end;
127 }
128
129 DBG("Deserializing condition from buffer");
130 condition_comm = (const struct lttng_condition_comm *) buffer->data;
131 condition_size += sizeof(*condition_comm);
132
133 switch ((enum lttng_condition_type) condition_comm->condition_type) {
134 case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
135 create_from_buffer = lttng_condition_buffer_usage_low_create_from_buffer;
136 break;
137 case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
138 create_from_buffer = lttng_condition_buffer_usage_high_create_from_buffer;
139 break;
140 case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE:
141 create_from_buffer = lttng_condition_session_consumed_size_create_from_buffer;
142 break;
143 default:
144 ERR("Attempted to create condition of unknown type (%i)",
145 (int) condition_comm->condition_type);
146 ret = -1;
147 goto end;
148 }
149
150 if (create_from_buffer) {
151 const struct lttng_buffer_view view =
152 lttng_buffer_view_from_view(buffer,
153 sizeof(*condition_comm), -1);
154
155 ret = create_from_buffer(&view, condition);
156 if (ret < 0) {
157 goto end;
158 }
159 condition_size += ret;
160
161 } else {
162 abort();
163 }
164
165 ret = condition_size;
166 end:
167 return ret;
168 }
169
170 LTTNG_HIDDEN
171 void lttng_condition_init(struct lttng_condition *condition,
172 enum lttng_condition_type type)
173 {
174 condition->type = type;
175 }
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