plugins work.

[chaz/openbox] / openbox / plugin.c

diff --git a/openbox/plugin.c b/openbox/plugin.c
new file mode 100644 (file)
index 0000000..d4c19b1
--- /dev/null
+++ b/openbox/plugin.c
@@ -0,0 +1,103 @@
+#include <glib.h>
+#include <gmodule.h>
+
+typedef void (*PluginStartup)();
+typedef void (*PluginShutdown)();
+
+typedef struct {
+    GModule *module;
+    char *name;
+
+    PluginStartup startup;
+    PluginShutdown shutdown;
+} Plugin;
+
+static gpointer load_sym(GModule *module, char *name, char *symbol)
+{
+    gpointer var = NULL;
+    if (!g_module_symbol(module, symbol, &var))
+        g_warning("Failed to load symbol '%s' from plugin '%s'", symbol, name);
+    return var;
+}
+
+static Plugin *plugin_new(char *name)
+{
+    Plugin *p;
+    char *path;
+   
+    p = g_new(Plugin, 1);
+
+    path = g_build_filename(PLUGINDIR, name, NULL);
+    p->module = g_module_open(path, G_MODULE_BIND_LAZY);
+    g_free(path);
+
+    if (p->module == NULL) {
+       path = g_build_filename(g_get_home_dir(), ".openbox", "plugins", name,
+                               NULL);
+       p->module = g_module_open(path, G_MODULE_BIND_LAZY);
+       g_free(path);
+    }
+
+    if (p->module == NULL) {
+        g_free(p);
+        return NULL;
+    }
+
+    p->startup = load_sym(p->module, name, "startup");
+    p->shutdown = load_sym(p->module, name, "shutdown");
+
+    if (p->startup == NULL || p->shutdown == NULL) {
+        g_module_close(p->module);
+        g_free(p);
+        return NULL;
+    }
+
+    p->name = g_strdup(name);
+    return p;
+}
+
+static void plugin_free(Plugin *p)
+{
+    p->shutdown();
+
+    g_free(p->name);
+    g_module_close(p->module);
+}
+
+
+static GData *plugins = NULL;
+
+void plugin_startup()
+{
+    g_datalist_init(&plugins);
+}
+
+void plugin_shutdown()
+{
+    g_datalist_clear(&plugins);
+}
+
+gboolean plugin_open(char *name)
+{
+    Plugin *p;
+
+    if (g_datalist_get_data(&plugins, name) != NULL) {
+        g_warning("plugin '%s' already loaded, can't load again", name);
+        return TRUE;
+    }
+
+    p = plugin_new(name);
+    if (p == NULL) {
+        g_warning("failed to load plugin '%s'", name);
+        return FALSE;
+    }
+
+    g_datalist_set_data_full(&plugins, name, p,  (GDestroyNotify) plugin_free);
+    p->startup();
+    return TRUE;
+}
+
+void plugin_close(char *name)
+{
+    g_datalist_remove_data(&plugins, name);
+}