LXR 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> */
  18struct 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};
  23enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */
  24
  25int fgconsole_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  26int 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}
  36