lincan/src/close_rtl.c

   1 /**************************************************************************/
   2 /* File: close_rtl.c - RT-Linux variant of the close systemcall           */
   3 /*                                                                        */
   4 /* LinCAN - (Not only) Linux CAN bus driver                               */
   5 /* Copyright (C) 2002-2009 DCE FEE CTU Prague <http://dce.felk.cvut.cz>   */
   6 /* Copyright (C) 2002-2009 Pavel Pisa <pisa@cmp.felk.cvut.cz>             */
   7 /* Funded by OCERA and FRESCOR IST projects                               */
   8 /* Based on CAN driver code by Arnaud Westenberg <arnaud@wanadoo.nl>      */
   9 /*                                                                        */
  10 /* LinCAN is free software; you can redistribute it and/or modify it      */
  11 /* under terms of the GNU General Public License as published by the      */
  12 /* Free Software Foundation; either version 2, or (at your option) any    */
  13 /* later version.  LinCAN is distributed in the hope that it will be      */
  14 /* useful, but WITHOUT ANY WARRANTY; without even the implied warranty    */
  15 /* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU    */
  16 /* General Public License for more details. You should have received a    */
  17 /* copy of the GNU General Public License along with LinCAN; see file     */
  18 /* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave,  */
  19 /* Cambridge, MA 02139, USA.                                              */
  20 /*                                                                        */
  21 /* To allow use of LinCAN in the compact embedded systems firmware        */
  22 /* and RT-executives (RTEMS for example), main authors agree with next    */
  23 /* special exception:                                                     */
  24 /*                                                                        */
  25 /* Including LinCAN header files in a file, instantiating LinCAN generics */
  26 /* or templates, or linking other files with LinCAN objects to produce    */
  27 /* an application image/executable, does not by itself cause the          */
  28 /* resulting application image/executable to be covered by                */
  29 /* the GNU General Public License.                                        */
  30 /* This exception does not however invalidate any other reasons           */
  31 /* why the executable file might be covered by the GNU Public License.    */
  32 /* Publication of enhanced or derived LinCAN files is required although.  */
  33 /**************************************************************************/
  34
  35 #ifdef CAN_WITH_RTL
  36
  37 #include "../include/can.h"
  38 #include "../include/can_sysdep.h"
  39 #include "../include/main.h"
  40
  41 #include <rtl_malloc.h>
  42 #include <rtl_posixio.h>
  43 #include "../include/can_iortl.h"
  44
  45 #define __NO_VERSION__
  46 #include <linux/module.h>
  47
  48 static inline
  49 int can_release_rtl_common(struct canuser_t *canuser, int file_flags)
  50 {
  51         struct canque_ends_t *qends;
  52         struct msgobj_t *obj;
  53         can_spin_irqflags_t iflags;
  54
  55         obj = canuser->msgobj;
  56         qends = canuser->qends;
  57
  58         can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
  59         list_del(&canuser->peers);
  60         can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
  61         canuser->qends = NULL;
  62         canqueue_ends_dispose_rtl(qends, file_flags & O_SYNC);
  63
  64         can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
  65         if(atomic_dec_and_test(&obj->obj_used)){
  66                 can_msgobj_clear_fl(obj,OPENED);
  67         };
  68         can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
  69
  70     #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,50))
  71         MOD_DEC_USE_COUNT;
  72     #endif
  73
  74         return 0;
  75 }
  76
  77
  78 int can_release_rtl_posix(struct rtl_file *fptr)
  79 {
  80         struct canuser_t *canuser =
  81                 (struct canuser_t *)can_get_rtl_file_private_data(fptr);
  82         int ret;
  83
  84         if(!canuser || (canuser->magic != CAN_USER_MAGIC)){
  85                 CANMSG("can_release_rtl_posix: bad canuser magic\n");
  86                 return -ENODEV;
  87         }
  88
  89         ret=can_release_rtl_common(canuser, fptr->f_flags);
  90
  91         rt_free(canuser);
  92
  93         return ret;
  94 }
  95
  96 #endif /*CAN_WITH_RTL*/
  97