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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/notification/notification-internal.h> | |
19 | #include <lttng/condition/condition-internal.h> | |
20 | #include <lttng/condition/evaluation-internal.h> | |
21 | #include <lttng/condition/condition.h> | |
22 | #include <lttng/condition/evaluation.h> | |
23 | #include <assert.h> | |
24 | ||
25 | LTTNG_HIDDEN | |
26 | struct lttng_notification *lttng_notification_create( | |
27 | struct lttng_condition *condition, | |
28 | struct lttng_evaluation *evaluation) | |
29 | { | |
30 | struct lttng_notification *notification = NULL; | |
31 | ||
32 | if (!condition || !evaluation) { | |
33 | goto end; | |
34 | } | |
35 | ||
36 | notification = zmalloc(sizeof(struct lttng_notification)); | |
37 | if (!notification) { | |
38 | goto end; | |
39 | } | |
40 | ||
41 | notification->condition = condition; | |
42 | notification->evaluation = evaluation; | |
43 | notification->owns_elements = false; | |
44 | end: | |
45 | return notification; | |
46 | } | |
47 | ||
48 | LTTNG_HIDDEN | |
49 | ssize_t lttng_notification_serialize(struct lttng_notification *notification, | |
50 | char *buf) | |
51 | { | |
52 | ssize_t ret, condition_size, evaluation_size, offset = 0; | |
1e9e2705 | 53 | struct lttng_notification_comm notification_comm = { 0 }; |
a58c490f JG |
54 | |
55 | if (!notification) { | |
56 | ret = -1; | |
57 | goto end; | |
58 | } | |
59 | ||
60 | offset += sizeof(notification_comm); | |
61 | condition_size = lttng_condition_serialize(notification->condition, | |
62 | buf ? (buf + offset) : NULL); | |
63 | if (condition_size < 0) { | |
64 | ret = condition_size; | |
65 | goto end; | |
66 | } | |
67 | offset += condition_size; | |
68 | ||
69 | evaluation_size = lttng_evaluation_serialize(notification->evaluation, | |
70 | buf ? (buf + offset) : NULL); | |
71 | if (evaluation_size < 0) { | |
72 | ret = evaluation_size; | |
73 | goto end; | |
74 | } | |
75 | offset += evaluation_size; | |
76 | ||
77 | if (buf) { | |
78 | notification_comm.length = | |
79 | (uint32_t) (condition_size + evaluation_size); | |
80 | memcpy(buf, ¬ification_comm, sizeof(notification_comm)); | |
81 | } | |
82 | ret = offset; | |
83 | end: | |
84 | return ret; | |
85 | ||
86 | } | |
87 | ||
88 | LTTNG_HIDDEN | |
89 | ssize_t lttng_notification_create_from_buffer( | |
90 | const struct lttng_buffer_view *src_view, | |
91 | struct lttng_notification **notification) | |
92 | { | |
93 | ssize_t ret, notification_size = 0, condition_size, evaluation_size; | |
94 | const struct lttng_notification_comm *notification_comm; | |
95 | struct lttng_condition *condition; | |
96 | struct lttng_evaluation *evaluation; | |
97 | struct lttng_buffer_view condition_view; | |
98 | struct lttng_buffer_view evaluation_view; | |
99 | ||
100 | if (!src_view || !notification) { | |
101 | ret = -1; | |
102 | goto end; | |
103 | } | |
104 | ||
105 | notification_comm = | |
106 | (const struct lttng_notification_comm *) src_view->data; | |
107 | notification_size += sizeof(*notification_comm); | |
108 | ||
109 | /* struct lttng_condition */ | |
110 | condition_view = lttng_buffer_view_from_view(src_view, | |
111 | sizeof(*notification_comm), -1); | |
112 | condition_size = lttng_condition_create_from_buffer(&condition_view, | |
113 | &condition); | |
114 | if (condition_size < 0) { | |
115 | ret = condition_size; | |
116 | goto end; | |
117 | } | |
118 | notification_size += condition_size; | |
119 | ||
120 | /* struct lttng_evaluation */ | |
121 | evaluation_view = lttng_buffer_view_from_view(&condition_view, | |
122 | condition_size, -1); | |
123 | evaluation_size = lttng_evaluation_create_from_buffer(&evaluation_view, | |
124 | &evaluation); | |
125 | if (evaluation_size < 0) { | |
126 | ret = evaluation_size; | |
127 | goto end; | |
128 | } | |
129 | notification_size += evaluation_size; | |
130 | ||
131 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
132 | if ((ssize_t) notification_comm->length != | |
133 | condition_size + evaluation_size) { | |
134 | ret = -1; | |
135 | goto error; | |
136 | } | |
137 | ||
138 | *notification = lttng_notification_create(condition, evaluation); | |
139 | if (!*notification) { | |
140 | ret = -1; | |
141 | goto error; | |
142 | } | |
143 | ret = notification_size; | |
144 | (*notification)->owns_elements = true; | |
145 | end: | |
146 | return ret; | |
147 | error: | |
148 | lttng_condition_destroy(condition); | |
149 | lttng_evaluation_destroy(evaluation); | |
150 | return ret; | |
151 | } | |
152 | ||
153 | void lttng_notification_destroy(struct lttng_notification *notification) | |
154 | { | |
155 | if (!notification) { | |
156 | return; | |
157 | } | |
158 | ||
159 | if (notification->owns_elements) { | |
160 | lttng_condition_destroy(notification->condition); | |
161 | lttng_evaluation_destroy(notification->evaluation); | |
162 | } | |
163 | free(notification); | |
164 | } | |
165 | ||
166 | const struct lttng_condition *lttng_notification_get_condition( | |
167 | struct lttng_notification *notification) | |
168 | { | |
169 | return notification ? notification->condition : NULL; | |
170 | } | |
171 | ||
172 | const struct lttng_evaluation *lttng_notification_get_evaluation( | |
173 | struct lttng_notification *notification) | |
174 | { | |
175 | return notification ? notification->evaluation : NULL; | |
176 | } |