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- /*
- This file is part of GNUnet.
- Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 Christian Grothoff (and other contributing authors)
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3, or (at your
- option) any later version.
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA.
- */
- /**
- * @author Christian Grothoff
- *
- * @file
- * Plugin loading and unloading
- *
- * @defgroup plugin Plugin library
- * Plugin loading and unloading
- * @{
- */
- #ifndef GNUNET_PLUGIN_LIB_H
- #define GNUNET_PLUGIN_LIB_H
- #ifdef __cplusplus
- extern "C"
- {
- #if 0 /* keep Emacsens' auto-indent happy */
- }
- #endif
- #endif
- #include "gnunet_common.h"
- #include "gnunet_configuration_lib.h"
- /**
- * Signature of any function exported by a plugin.
- *
- * @param arg argument to the function (context)
- * @return some pointer, NULL if the plugin was
- * shutdown or if there was an error, otherwise
- * the plugin's API on success
- */
- typedef void *(*GNUNET_PLUGIN_Callback) (void *arg);
- /**
- * Test if a plugin exists.
- *
- * Note that the library must export a symbol called
- * "library_name_init" for the test to succeed.
- *
- * @param library_name name of the plugin to test if it is installed
- * @return #GNUNET_YES if the plugin exists, #GNUNET_NO if not
- */
- int
- GNUNET_PLUGIN_test (const char *library_name);
- /**
- * Setup plugin (runs the "init" callback and returns whatever "init"
- * returned). If "init" returns NULL, the plugin is unloaded.
- *
- * Note that the library must export symbols called
- * "library_name_init" and "library_name_done". These will be called
- * when the library is loaded and unloaded respectively.
- *
- * @param library_name name of the plugin to load
- * @param arg argument to the plugin initialization function
- * @return whatever the initialization function returned, NULL on error
- */
- void *
- GNUNET_PLUGIN_load (const char *library_name, void *arg);
- /**
- * Signature of a function called by 'GNUNET_PLUGIN_load_all'.
- *
- * @param cls closure
- * @param library_name full name of the library (to be used with
- * #GNUNET_PLUGIN_unload)
- * @param lib_ret return value from the initialization function
- * of the library (same as what #GNUNET_PLUGIN_load would
- * have returned for the given library name)
- */
- typedef void (*GNUNET_PLUGIN_LoaderCallback) (void *cls,
- const char *library_name,
- void *lib_ret);
- /**
- * Load all compatible plugins with the given base name.
- *
- * Note that the library must export symbols called
- * "basename_ANYTHING_init" and "basename_ANYTHING__done". These will
- * be called when the library is loaded and unloaded respectively.
- *
- * @param basename basename of the plugins to load
- * @param arg argument to the plugin initialization function
- * @param cb function to call for each plugin found
- * @param cb_cls closure for @a cb
- */
- void
- GNUNET_PLUGIN_load_all (const char *basename, void *arg,
- GNUNET_PLUGIN_LoaderCallback cb, void *cb_cls);
- /**
- * Unload plugin (runs the "done" callback and returns whatever "done"
- * returned). The plugin is then unloaded.
- *
- * @param library_name name of the plugin to unload
- * @param arg argument to the plugin shutdown function
- * @return whatever the shutdown function returned, typically NULL
- * or a "char *" representing the error message
- */
- void *
- GNUNET_PLUGIN_unload (const char *library_name, void *arg);
- #if 0 /* keep Emacsens' auto-indent happy */
- {
- #endif
- #ifdef __cplusplus
- }
- #endif
- /* ifndef GNUNET_PLUGIN_LIB_H */
- #endif
- /** @} */ /* end of group */
- /* end of gnunet_plugin_lib.h */
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