ul_callback.c

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/*
 * $Id: ul_callback.c 4518 2008-07-28 15:39:28Z henningw $
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio 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
 *
 * Kamailio 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
 *
 * History:
 * --------
 *  2004-03-16  created (bogdan)
 */

/*! \file
 *  \brief USRLOC - Callback functions
 *  \ingroup usrloc
 *
 * - Module: \ref usrloc
 */


#include <stdlib.h>

#include "../../dprint.h"
#include "../../error.h"
#include "../../mem/shm_mem.h"
#include "ul_callback.h"


struct ulcb_head_list* ulcb_list = 0;



int init_ulcb_list(void)
{
   ulcb_list = (struct ulcb_head_list*)shm_malloc
      ( sizeof(struct ulcb_head_list) );
   if (ulcb_list==0) {
      LM_CRIT("no more shared mem\n");
      return -1;
   }
   ulcb_list->first = 0;
   ulcb_list->reg_types = 0;
   return 1;
}


void destroy_ulcb_list(void)
{
   struct ul_callback *cbp, *cbp_tmp;

   if (!ulcb_list)
      return;

   for( cbp=ulcb_list->first; cbp ; ) {
      cbp_tmp = cbp;
      cbp = cbp->next;
      if (cbp_tmp->param) shm_free( cbp_tmp->param );
      shm_free( cbp_tmp );
   }

   shm_free(ulcb_list);
}



/*! \brief 
   register a callback function 'f' for 'types' mask of events;
*/
int register_ulcb( int types, ul_cb f, void *param )
{
   struct ul_callback *cbp;

   /* are the callback types valid?... */
   if ( types<0 || types>ULCB_MAX ) {
      LM_CRIT("invalid callback types: mask=%d\n",types);
      return E_BUG;
   }
   /* we don't register null functions */
   if (f==0) {
      LM_CRIT("null callback function\n");
      return E_BUG;
   }

   /* build a new callback structure */
   if (!(cbp=(struct ul_callback*)shm_malloc(sizeof( struct ul_callback)))) {
      LM_ERR("no more share mem\n");
      return E_OUT_OF_MEM;
   }

   /* link it into the proper place... */
   cbp->next = ulcb_list->first;
   ulcb_list->first = cbp;
   ulcb_list->reg_types |= types;
   /* ... and fill it up */
   cbp->callback = f;
   cbp->param = param;
   cbp->types = types;
   if (cbp->next)
      cbp->id = cbp->next->id+1;
   else
      cbp->id = 0;

   return 1;
}