-/* write.c
- * Linux CAN-bus device driver.
- * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
- * Rewritten for new CAN queues by Pavel Pisa - OCERA team member
- * email:pisa@cmp.felk.cvut.cz
- * This software is released under the GPL-License.
- * Version lincan-0.2 9 Jul 2003
- */
+/**************************************************************************/
+/* File: write.c - systemcall to send messages through driver FIFOs */
+/* */
+/* LinCAN - (Not only) Linux CAN bus driver */
+/* Copyright (C) 2002-2009 DCE FEE CTU Prague <http://dce.felk.cvut.cz> */
+/* Copyright (C) 2002-2009 Pavel Pisa <pisa@cmp.felk.cvut.cz> */
+/* Funded by OCERA and FRESCOR IST projects */
+/* Based on CAN driver code by Arnaud Westenberg <arnaud@wanadoo.nl> */
+/* */
+/* LinCAN is free software; you can redistribute it and/or modify it */
+/* under terms of the GNU General Public License as published by the */
+/* Free Software Foundation; either version 2, or (at your option) any */
+/* later version. LinCAN 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 LinCAN; see file */
+/* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, */
+/* Cambridge, MA 02139, USA. */
+/* */
+/* To allow use of LinCAN in the compact embedded systems firmware */
+/* and RT-executives (RTEMS for example), main authors agree with next */
+/* special exception: */
+/* */
+/* Including LinCAN header files in a file, instantiating LinCAN generics */
+/* or templates, or linking other files with LinCAN objects to produce */
+/* an application image/executable, does not by itself cause the */
+/* resulting application image/executable to be covered by */
+/* the GNU General Public License. */
+/* This exception does not however invalidate any other reasons */
+/* why the executable file might be covered by the GNU Public License. */
+/* Publication of enhanced or derived LinCAN files is required although. */
+/**************************************************************************/
#include "../include/can.h"
#include "../include/can_sysdep.h"
#include "../include/main.h"
+#include "../include/write.h"
ssize_t can_write(struct file *file, const char *buffer, size_t length, loff_t *offset)
{
struct canque_ends_t *qends;
struct canque_edge_t *qedge;
struct canque_slot_t *slot;
- int ret = 0;
+ int ret;
unsigned bytes_to_copy;
if(!canuser || (canuser->magic != CAN_USER_MAGIC)){
/* Prepare first message */
- copy_from_user(&msg_buff, buffer, sizeof(struct canmsg_t));
+ ret = copy_from_user(&msg_buff, buffer, sizeof(struct canmsg_t));
+ if(ret) return -EFAULT;
/* Automatic selection of extended format if ID>2047 */
if (msg_buff.id & ~0x7ffl & MSG_ID_MASK ) msg_buff.flags |= MSG_EXT;
while (bytes_to_copy >= sizeof(struct canmsg_t)) {
bytes_to_copy -= sizeof(struct canmsg_t);
/* Prepare first message */
- copy_from_user(&msg_buff, buffer, sizeof(struct canmsg_t));
+ ret = copy_from_user(&msg_buff, buffer, sizeof(struct canmsg_t));
+ if(ret) return -EFAULT;
/* Automatic selection of extended format if ID>2047 */
if (msg_buff.id & ~0x7ffl & MSG_ID_MASK ) msg_buff.flags |= MSG_EXT;