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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 | ||
e2ba1c78 | 67 | struct lttng_action *lttng_trigger_get_action( |
a58c490f JG |
68 | struct lttng_trigger *trigger) |
69 | { | |
70 | return trigger ? trigger->action : NULL; | |
71 | } | |
72 | ||
73 | void lttng_trigger_destroy(struct lttng_trigger *trigger) | |
74 | { | |
75 | if (!trigger) { | |
76 | return; | |
77 | } | |
78 | ||
79 | free(trigger); | |
80 | } | |
81 | ||
82 | LTTNG_HIDDEN | |
83 | ssize_t lttng_trigger_create_from_buffer( | |
84 | const struct lttng_buffer_view *src_view, | |
85 | struct lttng_trigger **trigger) | |
86 | { | |
87 | ssize_t ret, offset = 0, condition_size, action_size; | |
88 | struct lttng_condition *condition = NULL; | |
89 | struct lttng_action *action = NULL; | |
90 | const struct lttng_trigger_comm *trigger_comm; | |
91 | struct lttng_buffer_view condition_view; | |
92 | struct lttng_buffer_view action_view; | |
93 | ||
94 | if (!src_view || !trigger) { | |
95 | ret = -1; | |
96 | goto end; | |
97 | } | |
98 | ||
99 | /* lttng_trigger_comm header */ | |
100 | trigger_comm = (const struct lttng_trigger_comm *) src_view->data; | |
101 | offset += sizeof(*trigger_comm); | |
102 | ||
103 | condition_view = lttng_buffer_view_from_view(src_view, offset, -1); | |
104 | ||
105 | /* struct lttng_condition */ | |
106 | condition_size = lttng_condition_create_from_buffer(&condition_view, | |
107 | &condition); | |
108 | if (condition_size < 0) { | |
109 | ret = condition_size; | |
110 | goto end; | |
111 | } | |
112 | offset += condition_size; | |
113 | ||
114 | /* struct lttng_action */ | |
115 | action_view = lttng_buffer_view_from_view(src_view, offset, -1); | |
116 | action_size = lttng_action_create_from_buffer(&action_view, &action); | |
117 | if (action_size < 0) { | |
118 | ret = action_size; | |
119 | goto end; | |
120 | } | |
121 | offset += action_size; | |
122 | ||
123 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
124 | if ((ssize_t) trigger_comm->length != condition_size + action_size) { | |
125 | ret = -1; | |
126 | goto error; | |
127 | } | |
128 | ||
129 | *trigger = lttng_trigger_create(condition, action); | |
130 | if (!*trigger) { | |
131 | ret = -1; | |
132 | goto error; | |
133 | } | |
134 | ret = offset; | |
135 | end: | |
136 | return ret; | |
137 | error: | |
138 | lttng_condition_destroy(condition); | |
139 | lttng_action_destroy(action); | |
140 | return ret; | |
141 | } | |
142 | ||
143 | /* | |
144 | * Returns the size of a trigger (header + condition + action). | |
145 | * Both elements are stored contiguously, see their "*_comm" structure | |
146 | * for the detailed format. | |
147 | */ | |
148 | LTTNG_HIDDEN | |
149 | ssize_t lttng_trigger_serialize(struct lttng_trigger *trigger, char *buf) | |
150 | { | |
1065191b | 151 | struct lttng_trigger_comm trigger_comm = { 0 }; |
a58c490f JG |
152 | ssize_t action_size, condition_size, offset = 0, ret; |
153 | ||
154 | if (!trigger) { | |
155 | ret = -1; | |
156 | goto end; | |
157 | } | |
158 | ||
159 | offset += sizeof(trigger_comm); | |
160 | condition_size = lttng_condition_serialize(trigger->condition, | |
161 | buf ? (buf + offset) : NULL); | |
162 | if (condition_size < 0) { | |
163 | ret = -1; | |
164 | goto end; | |
165 | } | |
166 | offset += condition_size; | |
167 | ||
168 | action_size = lttng_action_serialize(trigger->action, | |
169 | buf ? (buf + offset) : NULL); | |
170 | if (action_size < 0) { | |
171 | ret = -1; | |
172 | goto end; | |
173 | } | |
174 | offset += action_size; | |
175 | ||
176 | if (buf) { | |
177 | trigger_comm.length = (uint32_t) (condition_size + action_size); | |
178 | memcpy(buf, &trigger_comm, sizeof(trigger_comm)); | |
179 | } | |
180 | ret = offset; | |
181 | end: | |
182 | return ret; | |
183 | } |