modules/tm/t_hooks.c
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 /*
  * $Id$
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  *
  * Copyright (C) 2001-2003 Fhg Fokus
  *
  * This file is part of ser, a free SIP server.
  *
  * ser 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
  *
  * For a license to use the ser software under conditions
  * other than those described here, or to purchase support for this
  * software, please contact iptel.org by e-mail at the following addresses:
  *    info@iptel.org
  *
  * ser 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
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  */
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 /*
  * History:
  * --------
  *  2003-03-19  replaced all the mallocs/frees w/ pkg_malloc/pkg_free (andrei)
  */
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 #include "defs.h"
 
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 #include "stdlib.h"
 #include "../../dprint.h"
 #include "../../error.h"
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 #include "../../mem/mem.h"
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 #include "t_hooks.h"
 
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 /* strange things happen if callback_array is static on openbsd */
 struct tm_callback_s* callback_array[ TMCB_END ] = { 0, 0 } ;
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 static int callback_id=0;
 
 /* register a callback function 'f' of type 'cbt'; will be called
    back whenever the event 'cbt' occurs in transaction module
 */
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 int register_tmcb( tmcb_type cbt, transaction_cb f, void *param )
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 {
 	struct tm_callback_s *cbs;
 
 	if (cbt<0 || cbt>=TMCB_END ) {
 		LOG(L_ERR, "ERROR: register_tmcb: invalid callback type: %d\n",
 			cbt );
 		return E_BUG;
 	}
 
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 	if (!(cbs=pkg_malloc( sizeof( struct tm_callback_s)))) {
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 		LOG(L_ERR, "ERROR: register_tmcb: out of mem\n");
 		return E_OUT_OF_MEM;
 	}
 
 	callback_id++;
 	cbs->id=callback_id;
 	cbs->callback=f;
 	cbs->next=callback_array[ cbt ];
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 	cbs->param=param;
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 	callback_array[ cbt ]=cbs;
 
 	return callback_id;
 }
 
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 void callback_event( tmcb_type cbt , struct cell *trans,
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 	struct sip_msg *msg, int code )
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 {
 	struct tm_callback_s *cbs;
 
 	for (cbs=callback_array[ cbt ]; cbs; cbs=cbs->next)  {
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 		DBG("DBG: callback type %d, id %d entered\n", cbt, cbs->id );
 		cbs->callback( trans, msg, code, cbs->param );
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 	}
 }