#ifndef _LINUX_VT_H
  #define _LINUX_VT_H

  /*
   * These constants are also useful for user-level apps (e.g., VC
   * resizing).
   */
  #define MIN_NR_CONSOLES 1       /* must be at least 1 */
  #define MAX_NR_CONSOLES	63	/* serial lines start at 64 */
  #define MAX_NR_USER_CONSOLES 63	/* must be root to allocate above this */
  		/* Note: the ioctl VT_GETSTATE does not work for
  		   consoles 16 and higher (since it returns a short) */

  /* 0x56 is 'V', to avoid collision with termios and kd */
  
  #define VT_OPENQRY	0x5600	/* find available vt */
  
  struct vt_mode {
  	char mode;		/* vt mode */
  	char waitv;		/* if set, hang on writes if not active */
  	short relsig;		/* signal to raise on release req */
  	short acqsig;		/* signal to raise on acquisition */
  	short frsig;		/* unused (set to 0) */
  };
  #define VT_GETMODE	0x5601	/* get mode of active vt */
  #define VT_SETMODE	0x5602	/* set mode of active vt */
  #define		VT_AUTO		0x00	/* auto vt switching */
  #define		VT_PROCESS	0x01	/* process controls switching */

  #define		VT_ACKACQ	0x02	/* acknowledge switch */

  
  struct vt_stat {
  	unsigned short v_active;	/* active vt */
  	unsigned short v_signal;	/* signal to send */
  	unsigned short v_state;		/* vt bitmask */
  };
  #define VT_GETSTATE	0x5603	/* get global vt state info */
  #define VT_SENDSIG	0x5604	/* signal to send to bitmask of vts */
  
  #define VT_RELDISP	0x5605	/* release display */
  
  #define VT_ACTIVATE	0x5606	/* make vt active */
  #define VT_WAITACTIVE	0x5607	/* wait for vt active */
  #define VT_DISALLOCATE	0x5608  /* free memory associated to vt */
  
  struct vt_sizes {
  	unsigned short v_rows;		/* number of rows */
  	unsigned short v_cols;		/* number of columns */
  	unsigned short v_scrollsize;	/* number of lines of scrollback */
  };
  #define VT_RESIZE	0x5609	/* set kernel's idea of screensize */
  
  struct vt_consize {
  	unsigned short v_rows;	/* number of rows */
  	unsigned short v_cols;	/* number of columns */
  	unsigned short v_vlin;	/* number of pixel rows on screen */
  	unsigned short v_clin;	/* number of pixel rows per character */
  	unsigned short v_vcol;	/* number of pixel columns on screen */
  	unsigned short v_ccol;	/* number of pixel columns per character */
  };
  #define VT_RESIZEX      0x560A  /* set kernel's idea of screensize + more */
  #define VT_LOCKSWITCH   0x560B  /* disallow vt switching */
  #define VT_UNLOCKSWITCH 0x560C  /* allow vt switching */

  #define VT_GETHIFONTMASK 0x560D  /* return hi font mask */

  struct vt_event {
  	unsigned int event;
  #define VT_EVENT_SWITCH		0x0001	/* Console switch */
  #define VT_EVENT_BLANK		0x0002	/* Screen blank */
  #define VT_EVENT_UNBLANK	0x0004	/* Screen unblank */
  #define VT_EVENT_RESIZE		0x0008	/* Resize display */
  #define VT_MAX_EVENT		0x000F

  	unsigned int oldev;		/* Old console */
  	unsigned int newev;		/* New console (if changing) */

  	unsigned int pad[4];		/* Padding for expansion */
  };
  
  #define VT_WAITEVENT	0x560E	/* Wait for an event */

  struct vt_setactivate {
  	unsigned int console;
  	struct vt_mode mode;
  };
  
  #define VT_SETACTIVATE	0x560F	/* Activate and set the mode of a console */

  #ifdef __KERNEL__

  /* Virtual Terminal events. */
  #define VT_ALLOCATE		0x0001 /* Console got allocated */
  #define VT_DEALLOCATE		0x0002 /* Console will be deallocated */
  #define VT_WRITE		0x0003 /* A char got output */
  #define VT_UPDATE		0x0004 /* A bigger update occurred */
  #define VT_PREWRITE		0x0005 /* A char is about to be written to the console */

  #ifdef CONFIG_VT_CONSOLE
  
  extern int vt_kmsg_redirect(int new);
  
  #else
  
  static inline int vt_kmsg_redirect(int new)
  {
  	return 0;
  }
  
  #endif

  #endif /* __KERNEL__ */

  #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)

  #endif /* _LINUX_VT_H */