arch/parisc/include/asm/ioctl.h

   1 /*
   2  *    Linux/PA-RISC Project (http://www.parisc-linux.org/)
   3  *    Copyright (C) 1999,2003 Matthew Wilcox < willy at debian . org >
   4  *    portions from "linux/ioctl.h for Linux" by H.H. Bergman.
   5  *
   6  *    This program is free software; you can redistribute it and/or modify
   7  *    it under the terms of the GNU General Public License as published by
   8  *    the Free Software Foundation; either version 2 of the License, or
   9  *    (at your option) any later version.
  10  *
  11  *    This program is distributed in the hope that it will be useful,
  12  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *    GNU General Public License for more details.
  15  *
  16  *    You should have received a copy of the GNU General Public License
  17  *    along with this program; if not, write to the Free Software
  18  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21
  22 #ifndef _ASM_PARISC_IOCTL_H
  23 #define _ASM_PARISC_IOCTL_H
  24
  25 /* ioctl command encoding: 32 bits total, command in lower 16 bits,
  26  * size of the parameter structure in the lower 14 bits of the
  27  * upper 16 bits.
  28  * Encoding the size of the parameter structure in the ioctl request
  29  * is useful for catching programs compiled with old versions
  30  * and to avoid overwriting user space outside the user buffer area.
  31  * The highest 2 bits are reserved for indicating the ``access mode''.
  32  * NOTE: This limits the max parameter size to 16kB -1 !
  33  */
  34
  35 /*
  36  * Direction bits.
  37  */
  38 #define _IOC_NONE       0U
  39 #define _IOC_WRITE      2U
  40 #define _IOC_READ       1U
  41
  42 #include <asm-generic/ioctl.h>
  43
  44 #endif /* _ASM_PARISC_IOCTL_H */