Sync lttng-modules ABI version in internal kernel-ioctl.h
[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 <lttng/condition/session-rotation-internal.h>
22 #include <common/macros.h>
23 #include <common/error.h>
24 #include <common/dynamic-buffer.h>
25 #include <common/buffer-view.h>
26 #include <stdbool.h>
27 #include <assert.h>
28
29 enum lttng_condition_type lttng_condition_get_type(
30 const struct lttng_condition *condition)
31 {
32 return condition ? condition->type : LTTNG_CONDITION_TYPE_UNKNOWN;
33 }
34
35 void lttng_condition_destroy(struct lttng_condition *condition)
36 {
37 if (!condition) {
38 return;
39 }
40
41 assert(condition->destroy);
42 condition->destroy(condition);
43 }
44
45 LTTNG_HIDDEN
46 bool lttng_condition_validate(const struct lttng_condition *condition)
47 {
48 bool valid;
49
50 if (!condition) {
51 valid = false;
52 goto end;
53 }
54
55 if (!condition->validate) {
56 /* Sub-class guarantees that it can never be invalid. */
57 valid = true;
58 goto end;
59 }
60
61 valid = condition->validate(condition);
62 end:
63 return valid;
64 }
65
66 LTTNG_HIDDEN
67 int lttng_condition_serialize(const struct lttng_condition *condition,
68 struct lttng_dynamic_buffer *buf)
69 {
70 int ret;
71 struct lttng_condition_comm condition_comm = { 0 };
72
73 if (!condition) {
74 ret = -1;
75 goto end;
76 }
77
78 condition_comm.condition_type = (int8_t) condition->type;
79
80 ret = lttng_dynamic_buffer_append(buf, &condition_comm,
81 sizeof(condition_comm));
82 if (ret) {
83 goto end;
84 }
85
86 ret = condition->serialize(condition, buf);
87 if (ret) {
88 goto end;
89 }
90 end:
91 return ret;
92 }
93
94 LTTNG_HIDDEN
95 bool lttng_condition_is_equal(const struct lttng_condition *a,
96 const struct lttng_condition *b)
97 {
98 bool is_equal = false;
99
100 if (!a || !b) {
101 goto end;
102 }
103
104 if (a->type != b->type) {
105 goto end;
106 }
107
108 if (a == b) {
109 is_equal = true;
110 goto end;
111 }
112
113 is_equal = a->equal ? a->equal(a, b) : true;
114 end:
115 return is_equal;
116 }
117
118 LTTNG_HIDDEN
119 ssize_t lttng_condition_create_from_buffer(
120 const struct lttng_buffer_view *buffer,
121 struct lttng_condition **condition)
122 {
123 ssize_t ret, condition_size = 0;
124 const struct lttng_condition_comm *condition_comm;
125 condition_create_from_buffer_cb create_from_buffer = NULL;
126
127 if (!buffer || !condition) {
128 ret = -1;
129 goto end;
130 }
131
132 DBG("Deserializing condition from buffer");
133 condition_comm = (const struct lttng_condition_comm *) buffer->data;
134 condition_size += sizeof(*condition_comm);
135
136 switch ((enum lttng_condition_type) condition_comm->condition_type) {
137 case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
138 create_from_buffer = lttng_condition_buffer_usage_low_create_from_buffer;
139 break;
140 case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
141 create_from_buffer = lttng_condition_buffer_usage_high_create_from_buffer;
142 break;
143 case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE:
144 create_from_buffer = lttng_condition_session_consumed_size_create_from_buffer;
145 break;
146 case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING:
147 create_from_buffer = lttng_condition_session_rotation_ongoing_create_from_buffer;
148 break;
149 case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED:
150 create_from_buffer = lttng_condition_session_rotation_completed_create_from_buffer;
151 break;
152 default:
153 ERR("Attempted to create condition of unknown type (%i)",
154 (int) condition_comm->condition_type);
155 ret = -1;
156 goto end;
157 }
158
159 if (create_from_buffer) {
160 const struct lttng_buffer_view view =
161 lttng_buffer_view_from_view(buffer,
162 sizeof(*condition_comm), -1);
163
164 ret = create_from_buffer(&view, condition);
165 if (ret < 0) {
166 goto end;
167 }
168 condition_size += ret;
169
170 } else {
171 abort();
172 }
173
174 ret = condition_size;
175 end:
176 return ret;
177 }
178
179 LTTNG_HIDDEN
180 void lttng_condition_init(struct lttng_condition *condition,
181 enum lttng_condition_type type)
182 {
183 condition->type = type;
184 }
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