release/src/router/busybox/console-tools/fgconsole.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini fgconsole implementation for busybox
   4  *
   5  * Copyright (C) 2010 by Grigory Batalov <bga@altlinux.org>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9
  10 //usage:#define fgconsole_trivial_usage
  11 //usage:        ""
  12 //usage:#define fgconsole_full_usage "\n\n"
  13 //usage:        "Get active console"
  14
  15 #include "libbb.h"
  16
  17 /* From <linux/vt.h> */
  18 struct vt_stat {
  19         unsigned short v_active;        /* active vt */
  20         unsigned short v_signal;        /* signal to send */
  21         unsigned short v_state;         /* vt bitmask */
  22 };
  23 enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */
  24
  25 int fgconsole_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  26 int fgconsole_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  27 {
  28         struct vt_stat vtstat;
  29
  30         vtstat.v_active = 0;
  31         xioctl(get_console_fd_or_die(), VT_GETSTATE, &vtstat);
  32         printf("%d\n", vtstat.v_active);
  33
  34         return EXIT_SUCCESS;
  35 }