LinCAN sources go through big white-space cleanup.

[lincan.git] / lincan / src / select.c

diff --git a/lincan/src/select.c b/lincan/src/select.c
index 27b2d22c0f433cfd790c6b0fdb809952ab1f1a65..704aaf42fe3e28ce42546db81362513f1a67a250 100644 (file)
--- a/lincan/src/select.c
+++ b/lincan/src/select.c
@@ -1,56 +1,92 @@
-/* select.c
- * Header file for the Linux CAN-bus driver.
- * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
- * This software is released under the GPL-License.
- * Version 0.7.1-pi2  15 Nov 2002
- * 
- * added by Pavel Pisa pisa@cmp.felk.cvut.cz
- */
-
-#include <linux/autoconf.h>
-#if defined (CONFIG_MODVERSIONS) && !defined (MODVERSIONS)
-#define MODVERSIONS
-#endif
-
-#if defined (MODVERSIONS)
-#include <linux/modversions.h>
-#endif
-
-#include <linux/version.h>
-#include <linux/poll.h>
+/**************************************************************************/
+/* File: select.c - systemcall to wait for new messages and free Tx slots */
+/*                                                                        */
+/* 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 <linux/poll.h>
 #include "../include/select.h"
 
 unsigned int can_poll(struct file *file, poll_table *wait)
 {
-        unsigned int mask = 0;
+       struct canuser_t *canuser = (struct canuser_t*)(file->private_data);
+       struct canque_ends_t *qends;
        struct msgobj_t *obj;
-       struct canfifo_t *fifo;
+        unsigned int mask = 0;
+       struct canque_edge_t *edge;
+       int full=0;
+       int i;
 
-       /* Initialize hardware pointers */
-       if ( (obj = objects_p[MINOR_NR]) == NULL) {
-               CANMSG("Could not assign buffer structure\n");
-               return 0;
-       }
-       if ( (fifo = obj->fifo) == NULL) {
-               CANMSG("Could not assign buffer memory.\n");
-               return 0;
+       if(!canuser || (canuser->magic != CAN_USER_MAGIC)){
+               CANMSG("can_close: bad canuser magic\n");
+               return -ENODEV;
        }
 
-        if (file->f_mode & FMODE_WRITE) {
-                poll_wait(file, &fifo->writeq, wait);
-        }
+       obj = canuser->msgobj;
+       qends = canuser->qends;
+
         if (file->f_mode & FMODE_READ) {
-                poll_wait(file, &fifo->readq, wait);
+                poll_wait(file, &qends->endinfo.fileinfo.readq, wait);
+               for(i=CANQUEUE_PRIO_NR;--i>=0;) {
+                       if(!list_empty(&qends->active[i]))
+                               mask |= POLLIN | POLLRDNORM;
+               }
         }
-        if ((file->f_mode & FMODE_READ)&&
-           (fifo->rx_readp != fifo->rx_writep)) {
-                 mask |= POLLIN | POLLRDNORM;
-        }
-        if ((file->f_mode & FMODE_WRITE)&&
-           (fifo->tx_readp == fifo->tx_writep)) {
-                 mask |= POLLOUT | POLLWRNORM;
+
+        if ((file->f_mode & FMODE_WRITE) && !(file->f_flags & O_SYNC)) {
+                poll_wait(file, &qends->endinfo.fileinfo.writeq, wait);
+
+               canque_for_each_inedge(qends, edge) {
+                       if(canque_fifo_test_fl(&edge->fifo,FULL))
+                               full=1;
+               }
+
+               if(!full)
+                       mask |= POLLOUT | POLLWRNORM;
+       }
+
+        if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_SYNC)) {
+                poll_wait(file, &qends->endinfo.fileinfo.emptyq, wait);
+
+               canque_for_each_inedge(qends, edge) {
+                       if(!canque_fifo_test_fl(&edge->fifo,EMPTY))
+                               full=1;
+               }
+
+               if(!full)
+                       mask |= POLLOUT | POLLWRNORM;
        }
        return mask;
 }