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/*
This file is part of GNUnet.
Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @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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