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 //config:config FGCONSOLE
10 //config: bool "fgconsole (1.5 kb)"
11 //config: default y
12 //config: help
13 //config: This program prints active (foreground) console number.
14
15 //applet:IF_FGCONSOLE(APPLET_NOEXEC(fgconsole, fgconsole, BB_DIR_USR_BIN, BB_SUID_DROP, fgconsole))
16
17 //kbuild:lib-$(CONFIG_FGCONSOLE) += fgconsole.o
18
19 //usage:#define fgconsole_trivial_usage
20 //usage: ""
21 //usage:#define fgconsole_full_usage "\n\n"
22 //usage: "Get active console"
23
24 #include "libbb.h"
25
26 /* From <linux/vt.h> */
27 struct vt_stat {
28 unsigned short v_active; /* active vt */
29 unsigned short v_signal; /* signal to send */
30 unsigned short v_state; /* vt bitmask */
31 };
32 enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */
33
34 int fgconsole_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
fgconsole_main(int argc UNUSED_PARAM,char ** argv UNUSED_PARAM)35 int fgconsole_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
36 {
37 struct vt_stat vtstat;
38
39 vtstat.v_active = 0;
40 xioctl(get_console_fd_or_die(), VT_GETSTATE, &vtstat);
41 printf("%d\n", vtstat.v_active);
42
43 return EXIT_SUCCESS;
44 }
45