text: /*	$NetBSD: viewvar.h,v 1.4 1996/10/16 12:57:12 leo Exp $	*/
  
  /*
   * Copyright (c) 1994 Christian E. Hopps
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *      This product includes software developed by Christian E. Hopps.
   * 4. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /* The view major device is a placeholder device.  It serves
   * simply to map the semantics of a graphics dipslay to
   * the semantics of a character block device.  In other
   * words the graphics system as currently built does not like to be
   * refered to by open/close/ioctl.  This device serves as
   * a interface to graphics. */
  
  #define	NOPROC	((struct proc *)-1)	/* XXX */
  
  struct view_softc {
      struct  view_size size;
      view_t *view;
      pid_t   lock_process;
      int     flags;
  };
  
  enum view_unit_flag_bits {
      VUB_OPEN,
      VUB_ADDED,
      VUB_DISPLAY,
      VUB_LAST_BIT
  };
  
  enum view_unit_flags {
      VUF_OPEN    = 1<<VUB_OPEN,
      VUF_ADDED   = 1<<VUB_ADDED,
      VUF_DISPLAY = 1<<VUB_DISPLAY,
      VUF_MASK    = ((1<<VUB_LAST_BIT)-1)
  };
  
  #ifdef _KERNEL
  view_t	*viewview __P((dev_t));
  int	viewprobe __P((void));
  
  dev_type_close(viewclose);
  dev_type_ioctl(viewioctl);
  dev_type_open(viewopen);
  dev_type_mmap(viewmmap);
  dev_type_poll(viewpoll);
  
  #endif /* _KERNEL */
  