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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> | |
b8a06801 | 30 | #include <babeltrace/ref.h> |
fb2dcc52 JG |
31 | #include <babeltrace/plugin/plugin-internal.h> |
32 | #include <glib.h> | |
33 | ||
50335272 JG |
34 | #define PLUGIN_SYMBOL_NAME "__bt_plugin_name" |
35 | #define PLUGIN_SYMBOL_AUTHOR "__bt_plugin_author" | |
36 | #define PLUGIN_SYMBOL_LICENSE "__bt_plugin_license" | |
37 | #define PLUGIN_SYMBOL_INIT "__bt_plugin_init" | |
38 | #define PLUGIN_SYMBOL_EXIT "__bt_plugin_exit" | |
39 | ||
fb2dcc52 | 40 | static |
b8a06801 | 41 | void bt_plugin_destroy(struct bt_object *obj) |
fb2dcc52 JG |
42 | { |
43 | struct bt_plugin *plugin; | |
44 | ||
b8a06801 JG |
45 | assert(obj); |
46 | plugin = container_of(obj, struct bt_plugin, base); | |
47 | ||
fb2dcc52 JG |
48 | if (plugin->module) { |
49 | if (!g_module_close(plugin->module)) { | |
2e339de1 JG |
50 | printf_error("Module close error: %s", |
51 | g_module_error()); | |
fb2dcc52 JG |
52 | |
53 | } | |
54 | } | |
55 | g_free(plugin); | |
56 | } | |
57 | ||
58 | BT_HIDDEN | |
59 | struct bt_plugin *bt_plugin_create(GModule *module) | |
60 | { | |
50335272 | 61 | struct bt_plugin *plugin = NULL; |
2e339de1 | 62 | gpointer symbol = NULL; |
50335272 JG |
63 | |
64 | if (!module) { | |
65 | goto error; | |
66 | } | |
fb2dcc52 JG |
67 | |
68 | plugin = g_new0(struct bt_plugin, 1); | |
69 | if (!plugin) { | |
50335272 | 70 | goto error; |
fb2dcc52 JG |
71 | } |
72 | ||
b8a06801 | 73 | bt_object_init(plugin, bt_plugin_destroy); |
50335272 | 74 | if (!g_module_symbol(module, PLUGIN_SYMBOL_NAME, |
2e339de1 | 75 | (gpointer *) &plugin->name)) { |
50335272 | 76 | printf_error("Unable to resolve plugin symbol %s from %s", |
2e339de1 | 77 | PLUGIN_SYMBOL_NAME, g_module_name(module)); |
50335272 JG |
78 | goto error; |
79 | } | |
4647b93a | 80 | |
50335272 | 81 | if (!g_module_symbol(module, PLUGIN_SYMBOL_LICENSE, |
2e339de1 | 82 | (gpointer *) &plugin->license)) { |
50335272 | 83 | printf_error("Unable to resolve plugin symbol %s from %s", |
2e339de1 | 84 | PLUGIN_SYMBOL_LICENSE, g_module_name(module)); |
50335272 JG |
85 | goto error; |
86 | } | |
2e339de1 | 87 | if (!g_module_symbol(module, PLUGIN_SYMBOL_INIT, &symbol)) { |
50335272 | 88 | printf_error("Unable to resolve plugin symbol %s from %s", |
2e339de1 | 89 | PLUGIN_SYMBOL_INIT, g_module_name(module)); |
50335272 | 90 | goto error; |
2e339de1 JG |
91 | } else { |
92 | plugin->init = *((bt_plugin_init_func *) symbol); | |
93 | if (!plugin->init) { | |
94 | printf_error("NULL %s symbol target", | |
95 | PLUGIN_SYMBOL_INIT); | |
96 | goto error; | |
97 | } | |
50335272 JG |
98 | } |
99 | ||
2e339de1 JG |
100 | /* Optional */ |
101 | if (g_module_symbol(module, PLUGIN_SYMBOL_EXIT, | |
102 | (gpointer *) &symbol)) { | |
103 | plugin->exit = *((bt_plugin_exit_func *) symbol); | |
104 | } | |
50335272 | 105 | g_module_symbol(module, PLUGIN_SYMBOL_AUTHOR, |
2e339de1 | 106 | (gpointer *) &plugin->author); |
50335272 | 107 | |
fb2dcc52 | 108 | return plugin; |
50335272 | 109 | error: |
b8a06801 JG |
110 | BT_PUT(plugin); |
111 | return plugin; | |
fb2dcc52 JG |
112 | } |
113 | ||
114 | BT_HIDDEN | |
115 | enum bt_component_status bt_plugin_register_component_classes( | |
116 | struct bt_plugin *plugin, struct bt_component_factory *factory) | |
117 | { | |
118 | assert(plugin && factory); | |
119 | return plugin->init(factory); | |
120 | } | |
38b48196 JG |
121 | |
122 | const char *bt_plugin_get_name(struct bt_plugin *plugin) | |
123 | { | |
124 | return plugin ? plugin->name : NULL; | |
125 | } | |
126 | ||
127 | const char *bt_plugin_get_author(struct bt_plugin *plugin) | |
128 | { | |
129 | return plugin ? plugin->author : NULL; | |
130 | } | |
131 | ||
132 | const char *bt_plugin_get_license(struct bt_plugin *plugin) | |
133 | { | |
134 | return plugin ? plugin->license : NULL; | |
135 | } |