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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/trigger/trigger-internal.h> | |
19 | #include <lttng/condition/condition-internal.h> | |
20 | #include <lttng/action/action-internal.h> | |
21 | #include <common/error.h> | |
22 | #include <assert.h> | |
23 | ||
24 | LTTNG_HIDDEN | |
25 | bool lttng_trigger_validate(struct lttng_trigger *trigger) | |
26 | { | |
27 | bool valid; | |
28 | ||
29 | if (!trigger) { | |
30 | valid = false; | |
31 | goto end; | |
32 | } | |
33 | ||
34 | valid = lttng_condition_validate(trigger->condition) && | |
35 | lttng_action_validate(trigger->action); | |
36 | end: | |
37 | return valid; | |
38 | } | |
39 | ||
40 | struct lttng_trigger *lttng_trigger_create( | |
41 | struct lttng_condition *condition, | |
42 | struct lttng_action *action) | |
43 | { | |
44 | struct lttng_trigger *trigger = NULL; | |
45 | ||
46 | if (!condition || !action) { | |
47 | goto end; | |
48 | } | |
49 | ||
50 | trigger = zmalloc(sizeof(struct lttng_trigger)); | |
51 | if (!trigger) { | |
52 | goto end; | |
53 | } | |
54 | ||
55 | trigger->condition = condition; | |
56 | trigger->action = action; | |
57 | end: | |
58 | return trigger; | |
59 | } | |
60 | ||
61 | struct lttng_condition *lttng_trigger_get_condition( | |
62 | struct lttng_trigger *trigger) | |
63 | { | |
64 | return trigger ? trigger->condition : NULL; | |
65 | } | |
66 | ||
9b63a4aa JG |
67 | LTTNG_HIDDEN |
68 | const struct lttng_condition *lttng_trigger_get_const_condition( | |
69 | const struct lttng_trigger *trigger) | |
70 | { | |
71 | return trigger->condition; | |
72 | } | |
73 | ||
e2ba1c78 | 74 | struct lttng_action *lttng_trigger_get_action( |
a58c490f JG |
75 | struct lttng_trigger *trigger) |
76 | { | |
77 | return trigger ? trigger->action : NULL; | |
78 | } | |
79 | ||
9b63a4aa JG |
80 | LTTNG_HIDDEN |
81 | const struct lttng_action *lttng_trigger_get_const_action( | |
82 | const struct lttng_trigger *trigger) | |
83 | { | |
84 | return trigger->action; | |
85 | } | |
86 | ||
a58c490f JG |
87 | void lttng_trigger_destroy(struct lttng_trigger *trigger) |
88 | { | |
89 | if (!trigger) { | |
90 | return; | |
91 | } | |
92 | ||
93 | free(trigger); | |
94 | } | |
95 | ||
96 | LTTNG_HIDDEN | |
97 | ssize_t lttng_trigger_create_from_buffer( | |
98 | const struct lttng_buffer_view *src_view, | |
99 | struct lttng_trigger **trigger) | |
100 | { | |
101 | ssize_t ret, offset = 0, condition_size, action_size; | |
102 | struct lttng_condition *condition = NULL; | |
103 | struct lttng_action *action = NULL; | |
104 | const struct lttng_trigger_comm *trigger_comm; | |
105 | struct lttng_buffer_view condition_view; | |
106 | struct lttng_buffer_view action_view; | |
107 | ||
108 | if (!src_view || !trigger) { | |
109 | ret = -1; | |
110 | goto end; | |
111 | } | |
112 | ||
113 | /* lttng_trigger_comm header */ | |
114 | trigger_comm = (const struct lttng_trigger_comm *) src_view->data; | |
115 | offset += sizeof(*trigger_comm); | |
116 | ||
117 | condition_view = lttng_buffer_view_from_view(src_view, offset, -1); | |
118 | ||
119 | /* struct lttng_condition */ | |
120 | condition_size = lttng_condition_create_from_buffer(&condition_view, | |
121 | &condition); | |
122 | if (condition_size < 0) { | |
123 | ret = condition_size; | |
124 | goto end; | |
125 | } | |
126 | offset += condition_size; | |
127 | ||
128 | /* struct lttng_action */ | |
129 | action_view = lttng_buffer_view_from_view(src_view, offset, -1); | |
130 | action_size = lttng_action_create_from_buffer(&action_view, &action); | |
131 | if (action_size < 0) { | |
132 | ret = action_size; | |
133 | goto end; | |
134 | } | |
135 | offset += action_size; | |
136 | ||
137 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
138 | if ((ssize_t) trigger_comm->length != condition_size + action_size) { | |
139 | ret = -1; | |
140 | goto error; | |
141 | } | |
142 | ||
143 | *trigger = lttng_trigger_create(condition, action); | |
144 | if (!*trigger) { | |
145 | ret = -1; | |
146 | goto error; | |
147 | } | |
148 | ret = offset; | |
149 | end: | |
150 | return ret; | |
151 | error: | |
152 | lttng_condition_destroy(condition); | |
153 | lttng_action_destroy(action); | |
154 | return ret; | |
155 | } | |
156 | ||
157 | /* | |
a58c490f JG |
158 | * Both elements are stored contiguously, see their "*_comm" structure |
159 | * for the detailed format. | |
160 | */ | |
161 | LTTNG_HIDDEN | |
3647288f JG |
162 | int lttng_trigger_serialize(struct lttng_trigger *trigger, |
163 | struct lttng_dynamic_buffer *buf) | |
a58c490f | 164 | { |
3647288f JG |
165 | int ret; |
166 | size_t header_offset, size_before_payload; | |
1065191b | 167 | struct lttng_trigger_comm trigger_comm = { 0 }; |
3647288f | 168 | struct lttng_trigger_comm *header; |
a58c490f | 169 | |
3647288f JG |
170 | header_offset = buf->size; |
171 | ret = lttng_dynamic_buffer_append(buf, &trigger_comm, | |
172 | sizeof(trigger_comm)); | |
173 | if (ret) { | |
a58c490f JG |
174 | goto end; |
175 | } | |
176 | ||
3647288f JG |
177 | size_before_payload = buf->size; |
178 | ret = lttng_condition_serialize(trigger->condition, buf); | |
179 | if (ret) { | |
a58c490f JG |
180 | goto end; |
181 | } | |
a58c490f | 182 | |
3647288f JG |
183 | ret = lttng_action_serialize(trigger->action, buf); |
184 | if (ret) { | |
a58c490f JG |
185 | goto end; |
186 | } | |
a58c490f | 187 | |
3647288f JG |
188 | /* Update payload size. */ |
189 | header = (struct lttng_trigger_comm *) ((char *) buf->data + header_offset); | |
190 | header->length = buf->size - size_before_payload; | |
a58c490f JG |
191 | end: |
192 | return ret; | |
193 | } |