Structured comments updated.

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

diff --git a/lincan/src/select.c b/lincan/src/select.c
index 27b2d22c0f433cfd790c6b0fdb809952ab1f1a65..894214d36493d442b18e80570d62c2449b285065 100644 (file)
--- a/lincan/src/select.c
+++ b/lincan/src/select.c
@@ -1,56 +1,67 @@
 /* select.c
  * Header file for the Linux CAN-bus driver.
  * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
+ * Added by Pavel Pisa - OCERA team member
+ * email:pisa@cmp.felk.cvut.cz
  * 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
+ * Version lincan-0.2  9 Jul 2003
  */
 
-#include <linux/autoconf.h>
-#if defined (CONFIG_MODVERSIONS) && !defined (MODVERSIONS)
-#define MODVERSIONS
-#endif
-
-#if defined (MODVERSIONS)
-#include <linux/modversions.h>
-#endif
+#include "../include/can.h"
+#include "../include/can_sysdep.h"
+#include "../include/main.h"
 
-#include <linux/version.h>
 #include <linux/poll.h>
-
-#include "../include/main.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;
        }
+       
+       obj = canuser->msgobj;
+       qends = canuser->qends;
 
-        if (file->f_mode & FMODE_WRITE) {
-                poll_wait(file, &fifo->writeq, wait);
-        }
         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;
 }