cregit-Linux how code gets into the kernel

Release 4.12 include/uapi/linux/vt.h

#ifndef _UAPI_LINUX_VT_H

#define _UAPI_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 */
		/* 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 */

#endif /* _UAPI_LINUX_VT_H */

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