Adapt plugin system to use unified reference counting

[babeltrace.git] / plugins / plugin.c

diff --git a/plugins/plugin.c b/plugins/plugin.c
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..1a2eb11555d1585a62b3348f636d08f7dab0da4f 100644 (file)
--- a/plugins/plugin.c
+++ b/plugins/plugin.c
@@ -0,0 +1,112 @@
+/*
+ * plugin.c
+ *
+ * Babeltrace Plugin
+ * 
+ * Copyright 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <babeltrace/compiler.h>
+#include <babeltrace/ref.h>
+#include <babeltrace/plugin/plugin-internal.h>
+#include <glib.h>
+
+#define PLUGIN_SYMBOL_NAME     "__bt_plugin_name"
+#define PLUGIN_SYMBOL_AUTHOR   "__bt_plugin_author"
+#define PLUGIN_SYMBOL_LICENSE  "__bt_plugin_license"
+#define PLUGIN_SYMBOL_INIT     "__bt_plugin_init"
+#define PLUGIN_SYMBOL_EXIT     "__bt_plugin_exit"
+
+static
+void bt_plugin_destroy(struct bt_object *obj)
+{
+       struct bt_plugin *plugin;
+
+       assert(obj);
+       plugin = container_of(obj, struct bt_plugin, base);
+
+       if (plugin->module) {
+               if (!g_module_close(plugin->module)) {
+                       printf_error("Module close error: %s",
+                               g_module_error());
+
+               }
+       }
+       g_free(plugin);
+}
+
+BT_HIDDEN
+struct bt_plugin *bt_plugin_create(GModule *module)
+{
+       struct bt_plugin *plugin = NULL;
+
+       if (!module) {
+               goto error;
+       }
+
+       plugin = g_new0(struct bt_plugin, 1);
+       if (!plugin) {
+               goto error;
+       }
+
+       bt_object_init(plugin, bt_plugin_destroy);
+       if (!g_module_symbol(module, PLUGIN_SYMBOL_NAME,
+               (gpointer *) &plugin->name))
+       {
+               printf_error("Unable to resolve plugin symbol %s from %s",
+                       PLUGIN_SYMBOL_NAME, g_module_name(module));
+               goto error;
+       }
+       if (!g_module_symbol(module, PLUGIN_SYMBOL_LICENSE,
+               (gpointer *) &plugin->license))
+       {
+               printf_error("Unable to resolve plugin symbol %s from %s",
+                       PLUGIN_SYMBOL_LICENSE, g_module_name(module));
+               goto error;
+       }
+       if (!g_module_symbol(module, PLUGIN_SYMBOL_INIT,
+               (gpointer *) &plugin->init))
+       {
+               printf_error("Unable to resolve plugin symbol %s from %s",
+                       PLUGIN_SYMBOL_INIT, g_module_name(module));
+               goto error;
+       }
+
+       /* Optional symbols */
+       g_module_symbol(module, PLUGIN_SYMBOL_EXIT, (gpointer *) &plugin->exit);
+       g_module_symbol(module, PLUGIN_SYMBOL_AUTHOR,
+               (gpointer *) &plugin->author);
+
+       return plugin;
+error:
+        BT_PUT(plugin);
+       return plugin;
+}
+
+BT_HIDDEN
+enum bt_component_status bt_plugin_register_component_classes(
+               struct bt_plugin *plugin, struct bt_component_factory *factory)
+{
+       assert(plugin && factory);
+       return plugin->init(factory);
+}