/* * can_async - can4linux CAN driver module * * can4linux -- LINUX CAN device driver source * * This file is subject to the terms and conditions of the GNU General Public * License.  See the file "COPYING" in the main directory of this archive * for more details. * *  * Copyright (c) 2001 port GmbH Halle/Saale * (c) 2001 Heinz-J黵gen Oertel (oe@port.de) *          Claus Schroeter (clausi@chemie.fu-berlin.de) * Copyright (c) 2003  Phil Wilshire ( philwil@sysdcs.com) *------------------------------------------------------------------ * $Header: /z2/cvsroot/products/0530/software/can4linux/src/async.c,v 1.1 2006/04/21 16:25:56 oe Exp $ * *-------------------------------------------------------------------------- * * * modification history * -------------------- * $Log: async.c,v $ * Revision 1.1  2006/04/21 16:25:56  oe * - new version with new file structure for all architectures * * Revision 1.1  2004/05/14 10:06:53  oe * - started supporting async notification * * * *-------------------------------------------------------------------------- *//*** \file can_async.c* \author Phil Wilshire SDCS (philwil@sysdcs.com)* $Revision: 1.1 $* $Date: 2006/04/21 16:25:56 $***//* header of standard C - libraries *//* #include <linux/module.h>			 *//* header of common types *//* shared common header *//* header of project specific types *//* project headers */#include "defs.h"/* local header *//* constant definitions---------------------------------------------------------------------------*//* local defined data types---------------------------------------------------------------------------*//* list of external used functions, if not in headers---------------------------------------------------------------------------*//* list of global defined functions---------------------------------------------------------------------------*//* list of local defined functions---------------------------------------------------------------------------*//* external variables---------------------------------------------------------------------------*//* global variables---------------------------------------------------------------------------*//* local defined variables---------------------------------------------------------------------------*//* static char _rcsid[] = "$Id: async.c,v 1.1 2006/04/21 16:25:56 oe Exp $"; *//***************************************************************************//**** \brief int fasync(int fd, struct file *file, int count);** causes the async handler to be called* \param fd result of the open call*** \returns* return 0 * or -1 if an error occurred (in which case, errno is set appropriately).** \par ERRORS* the following errors can occur* \arg \c ENXIO  the file is a device special file* and no corresponding device exists.* \arg \c EINVAL illegal \b minor device number* \arg \c EINVAL wrong IO-model format in /proc/sys/Can/IOmodel* \arg \c EBUSY  IRQ for hardware is not available* \arg \c EBUSY  I/O region for hardware is not available*//** a call in the user application of fcntl(fd, F_SETOWN, getpid())  fills in the structure file->f_owner  the process id of the calling proces*/int can_fasync( __LDDK_FASYNC_PARAM ) /* inode, file, count */{int retval = 0;#if 0can_data_t *dev = (can_data_t *)file->private_data;    DBGin("can_fasync");    {      retval = fasync_helper(fd, file, count, &dev->fasyncptr);      DBGprint(DBG_DATA,(" -- async  count %d  retval %d\n", 			 count, retval));      if ( retval > 0 )	retval = 0;    }    DBGout();#endif    return retval;}