fgconsole: new applet by Grigory Batalov <bga@altlinux.org>

function                                             old     new   delta
fgconsole_main                                         -      51     +51
applet_names                                        2227    2237     +10
applet_main                                         1304    1308      +4
applet_nameofs                                       652     654      +2
applet_install_loc                                   163     164      +1
packed_usage                                       27079   27073      -6
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 4/1 up/down: 68/-6)              Total: 62 bytes

Signed-off-by: Grigory Batalov <bga@altlinux.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

3 files changed, 37 insertions, 0 deletions

diff --git a/console-tools/Config.in b/console-tools/Config.in
index 195685b97..a7e995936 100644
--- a/console-tools/Config.in
+++ b/console-tools/Config.in
@@ -12,6 +12,12 @@ config CHVT
           This program is used to change to another terminal.
           Example: chvt 4 (change to terminal /dev/tty4)
 
+config FGCONSOLE
+        bool "fgconsole"
+        default n
+        help
+          This program prints active (foreground) console number.
+
 config CLEAR
         bool "clear"
         default n
diff --git a/console-tools/Kbuild b/console-tools/Kbuild
index df5ffdb96..ad8b8ce77 100644
--- a/console-tools/Kbuild
+++ b/console-tools/Kbuild
@@ -6,6 +6,7 @@
 
 lib-y:=
 lib-$(CONFIG_CHVT)              += chvt.o
+lib-$(CONFIG_FGCONSOLE)         += fgconsole.o
 lib-$(CONFIG_CLEAR)             += clear.o
 lib-$(CONFIG_DEALLOCVT)         += deallocvt.o
 lib-$(CONFIG_DUMPKMAP)          += dumpkmap.o
diff --git a/console-tools/fgconsole.c b/console-tools/fgconsole.c
new file mode 100644
index 000000000..75fd98fd5
--- /dev/null
+++ b/console-tools/fgconsole.c
@@ -0,0 +1,30 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini fgconsole implementation for busybox
+ *
+ * Copyright (C) 2010 by Grigory Batalov <bga@altlinux.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+/* From <linux/vt.h> */
+struct vt_stat {
+        unsigned short v_active;        /* active vt */
+        unsigned short v_signal;        /* signal to send */
+        unsigned short v_state;         /* vt bitmask */
+};
+enum { VT_GETSTATE = 0x5603 }; /* get global vt state info */
+
+int fgconsole_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int fgconsole_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
+{
+        struct vt_stat vtstat;
+
+        vtstat.v_active = 0;
+        xioctl(get_console_fd_or_die(), VT_GETSTATE, &vtstat);
+        printf("%d\n", vtstat.v_active);
+
+        return EXIT_SUCCESS;
+}