plugins marked with a '!' are handled as critical: cancel if loading fails

src/libstrongswan/plugins/plugin_loader.h

@@ -33,11 +33,15 @@ struct plugin_loader_t {
 	/**
 	 * Load a list of plugins from a directory.
 	 *
+	 * Each plugin in list may have a ending exclamation mark (!) to mark it
+	 * as a critical plugin. If loading a critical plugin fails, plugin loading
+	 * is aborted and FALSE is returned.
+	 *
 	 * @param path			path containing loadable plugins
 	 * @param list			space separated list of plugins to load
-	 * @return				number of successfully loaded plugins
+	 * @return				TRUE if all critical plugins loaded successfully
 	 */
-	int (*load)(plugin_loader_t *this, char *path, char *list);
+	bool (*load)(plugin_loader_t *this, char *path, char *list);
 	
 	/**
 	 * Unload all loaded plugins.
@@ -52,9 +56,9 @@ struct plugin_loader_t {
 	enumerator_t* (*create_plugin_enumerator)(plugin_loader_t *this);
 	
 	/**
-     * Unload loaded plugins, destroy plugin_loader instance.
-     */
-    void (*destroy)(plugin_loader_t *this);
+	 * Unload loaded plugins, destroy plugin_loader instance.
+	 */
+	void (*destroy)(plugin_loader_t *this);
 };
 
 /**