/* vi: set sw=4 ts=4:
 *
 * chvt.c switch virtual terminals
 * 
 * Copyright (C) 2008 David Anders <danders@amltd.com>
 *
 * Not in SUSv3.

config CHVT
	bool "chvt"
	default y
	help
	  usage: chvt N

	  Change to virtual terminal number N.  (This only works in text mode.)

	  Virtual terminals are the Linux VGA text mode displays, ordinarily
	  switched between via alt-F1, alt-F2, etc.  Use ctrl-alt-F1 to switch
	  from X to a virtual terminal, and alt-F6 (or F7, or F8) to get back.
*/

#include "toys.h"

#define VT_ACTIVATE	0x5606
#define VT_WAITACTIVE	0x5607

/* note get_console_fb() will need to be moved into a seperate lib section */
int get_console_fd()
{
    int fd;

    fd = open("/dev/console", O_RDWR);
    if (fd >= 0)
	return fd;

    fd = open("/dev/vc/0", O_RDWR);
    if (fd >= 0)
	return fd;

    fd = open("/dev/tty", O_RDWR);
    if (fd >= 0)
	return fd;

    return -1;
}

void chvt_main(void)
{
    int vtnum,fd;


    if(!*toys.optargs)
	return;

    vtnum=atoi(*toys.optargs);

    fd=get_console_fd();
    if (fd < 0)
	return;
	
    if (ioctl(fd,VT_ACTIVATE,vtnum))
	return;

    if (ioctl(fd,VT_WAITACTIVE,vtnum))
	return;

}