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a58c490f JG |
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 | } |