| 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/ref.h> |
| 31 | #include <babeltrace/plugin/plugin-internal.h> |
| 32 | #include <glib.h> |
| 33 | |
| 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 | |
| 40 | static |
| 41 | void bt_plugin_destroy(struct bt_object *obj) |
| 42 | { |
| 43 | struct bt_plugin *plugin; |
| 44 | |
| 45 | assert(obj); |
| 46 | plugin = container_of(obj, struct bt_plugin, base); |
| 47 | |
| 48 | if (plugin->module) { |
| 49 | if (!g_module_close(plugin->module)) { |
| 50 | printf_error("Module close error: %s", |
| 51 | g_module_error()); |
| 52 | |
| 53 | } |
| 54 | } |
| 55 | g_free(plugin); |
| 56 | } |
| 57 | |
| 58 | BT_HIDDEN |
| 59 | struct bt_plugin *bt_plugin_create(GModule *module) |
| 60 | { |
| 61 | struct bt_plugin *plugin = NULL; |
| 62 | |
| 63 | if (!module) { |
| 64 | goto error; |
| 65 | } |
| 66 | |
| 67 | plugin = g_new0(struct bt_plugin, 1); |
| 68 | if (!plugin) { |
| 69 | goto error; |
| 70 | } |
| 71 | |
| 72 | bt_object_init(plugin, bt_plugin_destroy); |
| 73 | if (!g_module_symbol(module, PLUGIN_SYMBOL_NAME, |
| 74 | (gpointer *) &plugin->name)) |
| 75 | { |
| 76 | printf_error("Unable to resolve plugin symbol %s from %s", |
| 77 | PLUGIN_SYMBOL_NAME, g_module_name(module)); |
| 78 | goto error; |
| 79 | } |
| 80 | if (!g_module_symbol(module, PLUGIN_SYMBOL_LICENSE, |
| 81 | (gpointer *) &plugin->license)) |
| 82 | { |
| 83 | printf_error("Unable to resolve plugin symbol %s from %s", |
| 84 | PLUGIN_SYMBOL_LICENSE, g_module_name(module)); |
| 85 | goto error; |
| 86 | } |
| 87 | if (!g_module_symbol(module, PLUGIN_SYMBOL_INIT, |
| 88 | (gpointer *) &plugin->init)) |
| 89 | { |
| 90 | printf_error("Unable to resolve plugin symbol %s from %s", |
| 91 | PLUGIN_SYMBOL_INIT, g_module_name(module)); |
| 92 | goto error; |
| 93 | } |
| 94 | |
| 95 | /* Optional symbols */ |
| 96 | g_module_symbol(module, PLUGIN_SYMBOL_EXIT, (gpointer *) &plugin->exit); |
| 97 | g_module_symbol(module, PLUGIN_SYMBOL_AUTHOR, |
| 98 | (gpointer *) &plugin->author); |
| 99 | |
| 100 | return plugin; |
| 101 | error: |
| 102 | BT_PUT(plugin); |
| 103 | return plugin; |
| 104 | } |
| 105 | |
| 106 | BT_HIDDEN |
| 107 | enum bt_component_status bt_plugin_register_component_classes( |
| 108 | struct bt_plugin *plugin, struct bt_component_factory *factory) |
| 109 | { |
| 110 | assert(plugin && factory); |
| 111 | return plugin->init(factory); |
| 112 | } |