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fb2dcc52 JG |
1 | /* |
2 | * plugin.c | |
3 | * | |
4 | * Babeltrace Plugin | |
5 | * | |
6 | * Copyright 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
7 | * | |
8 | * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
9 | * | |
10 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
11 | * of this software and associated documentation files (the "Software"), to deal | |
12 | * in the Software without restriction, including without limitation the rights | |
13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
14 | * copies of the Software, and to permit persons to whom the Software is | |
15 | * furnished to do so, subject to the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice shall be included in | |
18 | * all copies or substantial portions of the Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
23 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
26 | * SOFTWARE. | |
27 | */ | |
28 | ||
29 | #include <babeltrace/compiler.h> | |
30 | #include <babeltrace/plugin/plugin-internal.h> | |
31 | #include <glib.h> | |
32 | ||
50335272 JG |
33 | #define PLUGIN_SYMBOL_NAME "__bt_plugin_name" |
34 | #define PLUGIN_SYMBOL_AUTHOR "__bt_plugin_author" | |
35 | #define PLUGIN_SYMBOL_LICENSE "__bt_plugin_license" | |
36 | #define PLUGIN_SYMBOL_INIT "__bt_plugin_init" | |
37 | #define PLUGIN_SYMBOL_EXIT "__bt_plugin_exit" | |
38 | ||
fb2dcc52 JG |
39 | static |
40 | void bt_plugin_destroy(struct bt_ref *ref) | |
41 | { | |
42 | struct bt_plugin *plugin; | |
43 | ||
44 | assert(ref); | |
45 | plugin = container_of(ref, struct bt_plugin, ref); | |
46 | if (plugin->module) { | |
47 | if (!g_module_close(plugin->module)) { | |
48 | printf_error("Module close error: %s", | |
49 | g_module_error()); | |
50 | ||
51 | } | |
52 | } | |
53 | g_free(plugin); | |
54 | } | |
55 | ||
56 | BT_HIDDEN | |
57 | struct bt_plugin *bt_plugin_create(GModule *module) | |
58 | { | |
50335272 JG |
59 | struct bt_plugin *plugin = NULL; |
60 | ||
61 | if (!module) { | |
62 | goto error; | |
63 | } | |
fb2dcc52 JG |
64 | |
65 | plugin = g_new0(struct bt_plugin, 1); | |
66 | if (!plugin) { | |
50335272 | 67 | goto error; |
fb2dcc52 JG |
68 | } |
69 | ||
70 | bt_ref_init(&plugin->ref, bt_plugin_destroy); | |
50335272 JG |
71 | if (!g_module_symbol(module, PLUGIN_SYMBOL_NAME, |
72 | (gpointer *) &plugin->name)) | |
73 | { | |
74 | printf_error("Unable to resolve plugin symbol %s from %s", | |
75 | PLUGIN_SYMBOL_NAME, g_module_name(module)); | |
76 | goto error; | |
77 | } | |
78 | if (!g_module_symbol(module, PLUGIN_SYMBOL_LICENSE, | |
79 | (gpointer *) &plugin->license)) | |
80 | { | |
81 | printf_error("Unable to resolve plugin symbol %s from %s", | |
82 | PLUGIN_SYMBOL_LICENSE, g_module_name(module)); | |
83 | goto error; | |
84 | } | |
85 | if (!g_module_symbol(module, PLUGIN_SYMBOL_INIT, | |
86 | (gpointer *) &plugin->init)) | |
87 | { | |
88 | printf_error("Unable to resolve plugin symbol %s from %s", | |
89 | PLUGIN_SYMBOL_INIT, g_module_name(module)); | |
90 | goto error; | |
91 | } | |
92 | ||
93 | /* Optional symbols */ | |
94 | g_module_symbol(module, PLUGIN_SYMBOL_EXIT, (gpointer *) &plugin->exit); | |
95 | g_module_symbol(module, PLUGIN_SYMBOL_AUTHOR, | |
96 | (gpointer *) &plugin->author); | |
97 | ||
fb2dcc52 | 98 | return plugin; |
50335272 JG |
99 | error: |
100 | bt_plugin_put(plugin); | |
101 | return NULL; | |
fb2dcc52 JG |
102 | } |
103 | ||
104 | BT_HIDDEN | |
105 | enum bt_component_status bt_plugin_register_component_classes( | |
106 | struct bt_plugin *plugin, struct bt_component_factory *factory) | |
107 | { | |
108 | assert(plugin && factory); | |
109 | return plugin->init(factory); | |
110 | } | |
111 | ||
112 | BT_HIDDEN | |
113 | void bt_plugin_get(struct bt_plugin *plugin) | |
114 | { | |
115 | if (!plugin) { | |
116 | return; | |
117 | } | |
118 | ||
119 | bt_ref_get(&plugin->ref); | |
120 | } | |
121 | ||
122 | BT_HIDDEN | |
123 | void bt_plugin_put(struct bt_plugin *plugin) | |
124 | { | |
125 | if (!plugin) { | |
126 | return; | |
127 | } | |
128 | ||
129 | bt_ref_put(&plugin->ref); | |
130 | } |