98c97a595016c772c54aead040809005f6838be2
[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 .condition_type = (int8_t) (condition ?
71 condition->type : LTTNG_CONDITION_TYPE_UNKNOWN)
72 };
73
74 if (!condition) {
75 ret = -1;
76 goto end;
77 }
78
79 ret = sizeof(struct lttng_condition_comm);
80 if (buf) {
81 memcpy(buf, &condition_comm, ret);
82 buf += ret;
83 }
84
85 condition_size = condition->serialize(condition, buf);
86 if (condition_size < 0) {
87 ret = condition_size;
88 goto end;
89 }
90 ret += condition_size;
91 end:
92 return ret;
93 }
94
95 LTTNG_HIDDEN
96 bool lttng_condition_is_equal(const struct lttng_condition *a,
97 const struct lttng_condition *b)
98 {
99 bool is_equal = false;
100
101 if (!a || !b) {
102 goto end;
103 }
104
105 if (a->type != b->type) {
106 goto end;
107 }
108
109 is_equal = a->equal ? a->equal(a, b) : true;
110 end:
111 return is_equal;
112 }
113
114 LTTNG_HIDDEN
115 ssize_t lttng_condition_create_from_buffer(
116 const struct lttng_buffer_view *buffer,
117 struct lttng_condition **condition)
118 {
119 ssize_t ret, condition_size = 0;
120 const struct lttng_condition_comm *condition_comm;
121 condition_create_from_buffer_cb create_from_buffer = NULL;
122
123 if (!buffer || !condition) {
124 ret = -1;
125 goto end;
126 }
127
128 DBG("Deserializing condition from buffer");
129 condition_comm = (const struct lttng_condition_comm *) buffer->data;
130 condition_size += sizeof(*condition_comm);
131
132 switch ((enum lttng_condition_type) condition_comm->condition_type) {
133 case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
134 create_from_buffer = lttng_condition_buffer_usage_low_create_from_buffer;
135 break;
136 case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
137 create_from_buffer = lttng_condition_buffer_usage_high_create_from_buffer;
138 break;
139 default:
140 ERR("Attempted to create condition of unknown type (%i)",
141 (int) condition_comm->condition_type);
142 ret = -1;
143 goto end;
144 }
145
146 if (create_from_buffer) {
147 const struct lttng_buffer_view view =
148 lttng_buffer_view_from_view(buffer,
149 sizeof(*condition_comm), -1);
150
151 ret = create_from_buffer(&view, condition);
152 if (ret < 0) {
153 goto end;
154 }
155 condition_size += ret;
156
157 } else {
158 abort();
159 }
160
161 ret = condition_size;
162 end:
163 return ret;
164 }
165
166 LTTNG_HIDDEN
167 void lttng_condition_init(struct lttng_condition *condition,
168 enum lttng_condition_type type)
169 {
170 condition->type = type;
171 }
This page took 0.049374 seconds and 4 git commands to generate.