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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; | |
a58c490f JG |
43 | end: |
44 | return notification; | |
45 | } | |
46 | ||
47 | LTTNG_HIDDEN | |
9b63a4aa | 48 | int lttng_notification_serialize(const struct lttng_notification *notification, |
3647288f | 49 | struct lttng_dynamic_buffer *buf) |
a58c490f | 50 | { |
3647288f JG |
51 | int ret; |
52 | size_t header_offset, size_before_payload; | |
1e9e2705 | 53 | struct lttng_notification_comm notification_comm = { 0 }; |
3647288f | 54 | struct lttng_notification_comm *header; |
a58c490f | 55 | |
3647288f JG |
56 | header_offset = buf->size; |
57 | ret = lttng_dynamic_buffer_append(buf, ¬ification_comm, | |
58 | sizeof(notification_comm)); | |
a58c490f | 59 | |
3647288f JG |
60 | size_before_payload = buf->size; |
61 | ret = lttng_condition_serialize(notification->condition, | |
62 | buf); | |
63 | if (ret) { | |
a58c490f JG |
64 | goto end; |
65 | } | |
a58c490f | 66 | |
3647288f JG |
67 | ret = lttng_evaluation_serialize(notification->evaluation, buf); |
68 | if (ret) { | |
a58c490f JG |
69 | goto end; |
70 | } | |
a58c490f | 71 | |
3647288f JG |
72 | /* Update payload size. */ |
73 | header = (struct lttng_notification_comm *) ((char *) buf->data + header_offset); | |
74 | header->length = (uint32_t) (buf->size - size_before_payload); | |
a58c490f JG |
75 | end: |
76 | return ret; | |
77 | ||
78 | } | |
79 | ||
80 | LTTNG_HIDDEN | |
81 | ssize_t lttng_notification_create_from_buffer( | |
82 | const struct lttng_buffer_view *src_view, | |
83 | struct lttng_notification **notification) | |
84 | { | |
85 | ssize_t ret, notification_size = 0, condition_size, evaluation_size; | |
86 | const struct lttng_notification_comm *notification_comm; | |
87 | struct lttng_condition *condition; | |
88 | struct lttng_evaluation *evaluation; | |
89 | struct lttng_buffer_view condition_view; | |
90 | struct lttng_buffer_view evaluation_view; | |
91 | ||
92 | if (!src_view || !notification) { | |
93 | ret = -1; | |
94 | goto end; | |
95 | } | |
96 | ||
97 | notification_comm = | |
98 | (const struct lttng_notification_comm *) src_view->data; | |
99 | notification_size += sizeof(*notification_comm); | |
100 | ||
101 | /* struct lttng_condition */ | |
102 | condition_view = lttng_buffer_view_from_view(src_view, | |
103 | sizeof(*notification_comm), -1); | |
104 | condition_size = lttng_condition_create_from_buffer(&condition_view, | |
105 | &condition); | |
106 | if (condition_size < 0) { | |
107 | ret = condition_size; | |
108 | goto end; | |
109 | } | |
110 | notification_size += condition_size; | |
111 | ||
112 | /* struct lttng_evaluation */ | |
113 | evaluation_view = lttng_buffer_view_from_view(&condition_view, | |
114 | condition_size, -1); | |
115 | evaluation_size = lttng_evaluation_create_from_buffer(&evaluation_view, | |
116 | &evaluation); | |
117 | if (evaluation_size < 0) { | |
118 | ret = evaluation_size; | |
119 | goto end; | |
120 | } | |
121 | notification_size += evaluation_size; | |
122 | ||
123 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
124 | if ((ssize_t) notification_comm->length != | |
125 | condition_size + evaluation_size) { | |
126 | ret = -1; | |
127 | goto error; | |
128 | } | |
129 | ||
130 | *notification = lttng_notification_create(condition, evaluation); | |
131 | if (!*notification) { | |
132 | ret = -1; | |
133 | goto error; | |
134 | } | |
135 | ret = notification_size; | |
a58c490f JG |
136 | end: |
137 | return ret; | |
138 | error: | |
139 | lttng_condition_destroy(condition); | |
140 | lttng_evaluation_destroy(evaluation); | |
141 | return ret; | |
142 | } | |
143 | ||
144 | void lttng_notification_destroy(struct lttng_notification *notification) | |
145 | { | |
146 | if (!notification) { | |
147 | return; | |
148 | } | |
149 | ||
9b63a4aa JG |
150 | lttng_condition_destroy(notification->condition); |
151 | lttng_evaluation_destroy(notification->evaluation); | |
a58c490f JG |
152 | free(notification); |
153 | } | |
154 | ||
155 | const struct lttng_condition *lttng_notification_get_condition( | |
156 | struct lttng_notification *notification) | |
157 | { | |
158 | return notification ? notification->condition : NULL; | |
159 | } | |
160 | ||
161 | const struct lttng_evaluation *lttng_notification_get_evaluation( | |
162 | struct lttng_notification *notification) | |
163 | { | |
164 | return notification ? notification->evaluation : NULL; | |
165 | } |