LXR toybox/toys/other/chvt.c

   1/* chvt.c - switch virtual terminals
   2 *
   3 * Copyright (C) 2008 David Anders <danders@amltd.com>
   4
   5USE_CHVT(NEWTOY(chvt, "<1", TOYFLAG_USR|TOYFLAG_BIN))
   6
   7config CHVT
   8  bool "chvt"
   9  default y
  10  help
  11    usage: chvt N
  12
  13    Change to virtual terminal number N. (This only works in text mode.)
  14
  15    Virtual terminals are the Linux VGA text mode displays, ordinarily
  16    switched between via alt-F1, alt-F2, etc. Use ctrl-alt-F1 to switch
  17    from X to a virtual terminal, and alt-F6 (or F7, or F8) to get back.
  18*/
  19
  20#include "toys.h"
  21
  22void chvt_main(void)
  23{
  24  int vtnum, fd = fd;
  25  char *consoles[]={"/dev/console", "/dev/vc/0", "/dev/tty", NULL}, **cc;
  26
  27  vtnum=atoi(*toys.optargs);
  28  for (cc = consoles; *cc; cc++)
  29    if (-1 != (fd = open(*cc, O_RDWR))) break;
  30
  31  // These numbers are VT_ACTIVATE and VT_WAITACTIVE from linux/vt.h
  32  if (!*cc || fd < 0 || ioctl(fd, 0x5606, vtnum) || ioctl(fd, 0x5607, vtnum))
  33    perror_exit(0);
  34}
  35