Silence bogus Coverity warning of uninitialized value
[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->type
71 };
72
73 if (!condition) {
74 ret = -1;
75 goto end;
76 }
77
78 ret = sizeof(struct lttng_condition_comm);
79 if (buf) {
80 memcpy(buf, &condition_comm, ret);
81 buf += ret;
82 }
83
84 condition_size = condition->serialize(condition, buf);
85 if (condition_size < 0) {
86 ret = condition_size;
87 goto end;
88 }
89 ret += condition_size;
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 is_equal = a->equal ? a->equal(a, b) : true;
109 end:
110 return is_equal;
111 }
112
113 LTTNG_HIDDEN
114 ssize_t lttng_condition_create_from_buffer(
115 const struct lttng_buffer_view *buffer,
116 struct lttng_condition **condition)
117 {
118 ssize_t ret, condition_size = 0;
119 const struct lttng_condition_comm *condition_comm;
120 condition_create_from_buffer_cb create_from_buffer = NULL;
121
122 if (!buffer || !condition) {
123 ret = -1;
124 goto end;
125 }
126
127 DBG("Deserializing condition from buffer");
128 condition_comm = (const struct lttng_condition_comm *) buffer->data;
129 condition_size += sizeof(*condition_comm);
130
131 switch ((enum lttng_condition_type) condition_comm->condition_type) {
132 case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW:
133 create_from_buffer = lttng_condition_buffer_usage_low_create_from_buffer;
134 break;
135 case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH:
136 create_from_buffer = lttng_condition_buffer_usage_high_create_from_buffer;
137 break;
138 default:
139 ERR("Attempted to create condition of unknown type (%i)",
140 (int) condition_comm->condition_type);
141 ret = -1;
142 goto end;
143 }
144
145 if (create_from_buffer) {
146 const struct lttng_buffer_view view =
147 lttng_buffer_view_from_view(buffer,
148 sizeof(*condition_comm), -1);
149
150 ret = create_from_buffer(&view, condition);
151 if (ret < 0) {
152 goto end;
153 }
154 condition_size += ret;
155
156 } else {
157 abort();
158 }
159
160 ret = condition_size;
161 end:
162 return ret;
163 }
164
165 LTTNG_HIDDEN
166 void lttng_condition_init(struct lttng_condition *condition,
167 enum lttng_condition_type type)
168 {
169 condition->type = type;
170 }
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