X-Git-Url: http://rtime.felk.cvut.cz/gitweb/lincan.git/blobdiff_plain/2ab57a4267546fa3f444007b91f2f5bf23ccdbea..04ac67cc3cac14cd601daacd0592121ec0b84012:/lincan/src/write.c

diff --git a/lincan/src/write.c b/lincan/src/write.c
index 4b65a14..d2f05d0 100644
--- a/lincan/src/write.c
+++ b/lincan/src/write.c
@@ -1,11 +1,36 @@
-/* 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-0.3  17 Jun 2004
- */
+/**************************************************************************/
+/* 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"
@@ -41,7 +66,7 @@ ssize_t can_write(struct file *file, const char *buffer, size_t length, loff_t *
 		CANMSG("The number of bytes requested to be written is not a multiple of\n");
 		CANMSG("'sizeof(struct canmsg_t)', currently this is not allowed.\n");
 		return -1;
-	} 
+	}
 
 	/* Initialize hardware pointers */
 	obj = canuser->msgobj;
@@ -63,7 +88,7 @@ ssize_t can_write(struct file *file, const char *buffer, size_t length, loff_t *
 	/* If the output buffer is full, return immediately in case O_NONBLOCK
 	 * has been specified or loop until space becomes available.
 	 */
-	if ((ret=canque_get_inslot4id(qends, &qedge, &slot, 
+	if ((ret=canque_get_inslot4id(qends, &qedge, &slot,
 			0, msg_buff.id, 0))<0){
 		DEBUGMSG("Buffer is full\n");
 		if(ret < -1)
@@ -72,7 +97,7 @@ ssize_t can_write(struct file *file, const char *buffer, size_t length, loff_t *
 		if (file->f_flags & O_NONBLOCK)
 			return -EAGAIN;
 
-		ret=canque_get_inslot4id_wait_kern(qends, &qedge, &slot, 
+		ret=canque_get_inslot4id_wait_kern(qends, &qedge, &slot,
 						0, msg_buff.id, 0);
 		if(ret<0) {
 			if (signal_pending(current))
@@ -86,7 +111,7 @@ ssize_t can_write(struct file *file, const char *buffer, size_t length, loff_t *
 	buffer += sizeof(struct canmsg_t);
 	bytes_to_copy = length-sizeof(struct canmsg_t);
 
-	/* 
+	/*
 	 * Try to send more messages
 	 */
 	while (bytes_to_copy >= sizeof(struct canmsg_t)) {
@@ -100,7 +125,7 @@ ssize_t can_write(struct file *file, const char *buffer, size_t length, loff_t *
 		/* has been dependent on "extended" option */
 
 		/* Get slot */
-		if(canque_get_inslot4id(qends, &qedge, &slot, 
+		if(canque_get_inslot4id(qends, &qedge, &slot,
 			0, msg_buff.id, 0) < 0) break;
 		slot->msg=msg_buff;
 		canque_put_inslot(qends, qedge, slot);
@@ -111,4 +136,4 @@ ssize_t can_write(struct file *file, const char *buffer, size_t length, loff_t *
 		canque_sync_wait_kern(qends, qedge);
 	}
 	return length-bytes_to_copy;
-}	
+}