Cleanup: enforce const-correctness in notification thread
[lttng-tools.git] / src / common / action.c
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/action/action-internal.h>
19 #include <lttng/action/notify-internal.h>
20 #include <common/error.h>
21 #include <assert.h>
22
23 enum lttng_action_type lttng_action_get_type(struct lttng_action *action)
24 {
25 return action ? action->type : LTTNG_ACTION_TYPE_UNKNOWN;
26 }
27
28 LTTNG_HIDDEN
29 enum lttng_action_type lttng_action_get_type_const(
30 const struct lttng_action *action)
31 {
32 return action->type;
33 }
34
35 void lttng_action_destroy(struct lttng_action *action)
36 {
37 if (!action) {
38 return;
39 }
40
41 assert(action->destroy);
42 action->destroy(action);
43 }
44
45 LTTNG_HIDDEN
46 bool lttng_action_validate(struct lttng_action *action)
47 {
48 bool valid;
49
50 if (!action) {
51 valid = false;
52 goto end;
53 }
54
55 if (!action->validate) {
56 /* Sub-class guarantees that it can never be invalid. */
57 valid = true;
58 goto end;
59 }
60
61 valid = action->validate(action);
62 end:
63 return valid;
64 }
65
66 LTTNG_HIDDEN
67 int lttng_action_serialize(struct lttng_action *action,
68 struct lttng_dynamic_buffer *buf)
69 {
70 int ret;
71 struct lttng_action_comm action_comm = {
72 .action_type = (int8_t) action->type,
73 };
74
75 ret = lttng_dynamic_buffer_append(buf, &action_comm,
76 sizeof(action_comm));
77 if (ret) {
78 goto end;
79 }
80
81 ret = action->serialize(action, buf);
82 if (ret) {
83 goto end;
84 }
85 end:
86 return ret;
87 }
88
89 LTTNG_HIDDEN
90 ssize_t lttng_action_create_from_buffer(const struct lttng_buffer_view *view,
91 struct lttng_action **_action)
92 {
93 ssize_t ret, action_size = sizeof(struct lttng_action_comm);
94 struct lttng_action *action;
95 const struct lttng_action_comm *action_comm;
96
97 if (!view || !_action) {
98 ret = -1;
99 goto end;
100 }
101
102 action_comm = (const struct lttng_action_comm *) view->data;
103 DBG("Deserializing action from buffer");
104 switch (action_comm->action_type) {
105 case LTTNG_ACTION_TYPE_NOTIFY:
106 action = lttng_action_notify_create();
107 break;
108 default:
109 ret = -1;
110 goto end;
111 }
112
113 if (!action) {
114 ret = -1;
115 goto end;
116 }
117 ret = action_size;
118 *_action = action;
119 end:
120 return ret;
121 }
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