/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2003 Piotr Nizynski, Advanced IRC Services Project Team
 *  Copyright (c) 2005-2014 ircd-hybrid development team
 *
 *  This program 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 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 */

/*! \file hook.h
 * \brief Provides a generic event hooking interface.
 * \version $Id$
 */

#ifndef __HOOK_H_INCLUDED
#define __HOOK_H_INCLUDED

#define is_callback_present(c) (!!dlink_list_length(&c->chain))

typedef void *CBFUNC(va_list);

struct Callback
{
  char *name;
  dlink_list chain;
  dlink_node node;
  unsigned int called;
  time_t last;
};

struct Client;

extern struct Callback *register_callback(const char *, CBFUNC *);
extern void *execute_callback(struct Callback *, ...);
extern struct Callback *find_callback(const char *);
extern dlink_node *install_hook(struct Callback *, CBFUNC *);
extern void uninstall_hook(struct Callback *, CBFUNC *);
extern void *pass_callback(dlink_node *, ...);
extern void stats_hooks(struct Client *);
#endif