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#ifndef PILS_GENERIC_H
#define PILS_GENERIC_H
/*
* Copyright (C) 2000 Alan Robertson <alanr@unix.sh>
* This software licensed under the GNU LGPL.
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*
* Generic interface (implementation) manager
*
* This manager will manage any number of types of interfaces.
*
* This means that when any implementations of our client interfaces register
* or unregister, it is us that makes their interfaces show up in the outside
* world.
*
* And, of course, we have to do this in a very generic way, since we have
* no idea about the client programs or interface types, or anything else.
*
* We do that by getting a parameter passed to us which tell us the names
* of the interface types we want to manage, and the address of a GHashTable
* for each type that we put the implementation in when they register
* themselves.
*
* So, each type of interface that we manage gets its own private
* GHashTable of the implementations of that type that are currently
* registered.
*
* For example, if we manage communication modules, their exported
* interfaces will be registered in a hash table. If we manage
* authentication modules, they'll have their (separate) hash table that
* their exported interfaces are registered in.
*
*/
#include <pils/interface.h>
/*
* Header defintions for using the generic interface/implementation
* manager plugin.
*/
/*
* Notification types for the callback function.
*/
typedef enum {
PIL_REGISTER, /* Someone has registered an implementation */
PIL_UNREGISTER /* Someone has unregistered an implementation */
}GenericPILCallbackType;
/* A user callback for the generic interface manager */
typedef int (*GenericPILCallback)
( GenericPILCallbackType type /* Event type */
, PILPluginUniv* univ /* pointer to plugin universe */
, const char * iftype /* Interface type */
, const char * ifname /* Implementation (interface) name */
, void * userptr /* Whatever you want it to be ;-) */
);
/*
* Structures to declare the set of interface types we're managing.
*/
typedef struct {
const char * iftype; /* What type of interface is this? */
GHashTable** ifmap; /* Table with implementation info */
void* importfuns; /* Functions for interface to import */
GenericPILCallback callback; /* Function2call when events occur */
void* userptr; /* Passed to Callback function */
}PILGenericIfMgmtRqst;
/*
* What does this look like in practice?
*
* GHashTable* authmodules = NULL;
* GHashTable* commmodules = NULL;
* PILGenericIfMgmtRqst RegisterRequests[] =
* {
* {"auth", &authmodules, &authimports, NULL, NULL},
* {"comm", &commmodules, &commimports, NULL, NULL},
* {NULL, NULL, NULL, NULL, NULL}
// NULL entry must be here
* };
*
* PILPlugin* PluginUniverse;
*
* PluginUniverse = NewPILPlugin("/usr/lib/whatever/plugins");
*
* PILLoadPlugin(PluginUniverse, "InterfaceMgr", "generic", &RegisterRequests);
* // N. B.: Passing RegisterRequests as an argument is essential
*
* Then, when you load an auth module, its exported interface gets added
* to "authmodules". When you unload an auth module, it gets removed
* from authmodules.
*
* Then, when you load a comm module, its exported interfaces gets added
* to "commodules". When you unload a comm module, its exported
* interfaces get removed from "commodules"
*
* If there are simple changes that would be useful for this generic
* plugin manager, then "patches are being accepted" :-)
*
* On the other hand, If you don't like the way this plugin manager works
* in a broader way, you're free to write your own - it's just another
* plugin ;-)
*/
#endif
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