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