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 #include "libbb.h"
  11
  12 /* From <linux/vt.h> */
  13 struct vt_stat {
  14         unsigned short v_active;        /* active vt */
  15         unsigned short v_signal;        /* signal to send */
  16         unsigned short v_state;         /* vt bitmask */
  17 };
  18 enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */
  19
  20 int fgconsole_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  21 int fgconsole_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  22 {
  23         struct vt_stat vtstat;
  24
  25         vtstat.v_active = 0;
  26         xioctl(get_console_fd_or_die(), VT_GETSTATE, &vtstat);
  27         printf("%d\n", vtstat.v_active);
  28
  29         return EXIT_SUCCESS;
  30 }