/* * can_read - can4linux CAN driver module * * * can4linux -- LINUX CAN device driver source *  * Copyright (c) 2001 port GmbH Halle/Saale * (c) 2001 Heinz-J黵gen Oertel (oe@port.de) *          Claus Schroeter (clausi@chemie.fu-berlin.de) * derived from the the LDDK can4linux version *     (c) 1996,1997 Claus Schroeter (clausi@chemie.fu-berlin.de) *------------------------------------------------------------------ * $Header: /z2/cvsroot/products/0530/software/can4linux/src/can_read.c,v 1.8 2005/08/29 08:58:20 oe Exp $ * *-------------------------------------------------------------------------- * * * modification history * -------------------- * $Log: can_read.c,v $ * Revision 1.8  2005/08/29 08:58:20  oe * *** empty log message *** * * Revision 1.7  2005/07/22 12:01:47  oe * applied patch by Steven Scholz * - new ioctl( , CONF_LISTEN_ONLY_MODE, ) * - replaced verify_area() by !access_ok() * * Revision 1.6  2004/12/14 09:36:35  oe * - Release for kernel 2.6 with support for 82527 included * * Revision 1.5  2003/08/27 13:06:27  oe * - Version 3.0 * * Revision 1.4  2001/09/14 14:58:09  oe * first free release * * Revision 1.3  2001/09/04 15:51:44  oe * changed struct file_operations can_fops * * Revision 1.2  2001/06/15 15:32:45  oe * - added PCI support EMS CPC-PCI * * Revision 1.1.1.1  2001/06/11 18:30:54  oe * minimal version can4linux embedded, compile time Konfigurierbar * * * * *-------------------------------------------------------------------------- *//*** \file can_read.c* \author Heinz-J黵gen Oertel, port GmbH* $Revision: 1.8 $* $Date: 2005/08/29 08:58:20 $** Module Description * see Doxygen Doc for all possibilities****//* header of standard C - libraries *//* header of common types *//* shared common header *//* header of project specific types *//* project headers */#include "at91_uart_defs.h"/* local header *//* constant definitions---------------------------------------------------------------------------*//* local defined data types---------------------------------------------------------------------------*//* list of external used functions, if not in headers---------------------------------------------------------------------------*//* list of global defined functions---------------------------------------------------------------------------*//* list of local defined functions---------------------------------------------------------------------------*//* external variables---------------------------------------------------------------------------*//* global variables---------------------------------------------------------------------------*//* local defined variables---------------------------------------------------------------------------*//* static char _rcsid[] = "$Id: can_read.c,v 1.8 2005/08/29 08:58:20 oe Exp $"; *//***************************************************************************//**** \brief ssize_t read(int fd, void *buf, size_t count);* the read system call* \param fd The descriptor to read from.* \param buf The destination data buffer (array of CAN canmsg_t).* \param count The number of bytes to read.** read() attempts to read up to \a count CAN messages from file* descriptor fd into the buffer starting at buf.* buf must be large enough to hold count times the size of * one CAN message structure \b canmsg_t.* * \codeint got;canmsg_t rx[80];			// receive buffer for read()    got = read(can_fd, rx , 80 );    if( got > 0) {      ...    } else {	// read returned with error	fprintf(stderr, "- Received got = %d\n", got);	fflush(stderr);    }* \endcode** \par ERRORS** the following errors can occur** \arg \c EINVAL \b buf points not to an large enough area,** \returns* On success, the number of bytes read is returned* (zero indicates end of file).* It is not an  error if this number is* smaller than the number of bytes requested;* this may happen for example* because fewer bytes are actually available right now,* or because read() was interrupted by a signal.* On error, -1 is returned, and errno is set  appropriately.** \internal*/__LDDK_READ_TYPE at91_uart_read( struct file *file, char *buffer, size_t count, loff_t *loff ){	return 0;}