1 /* vi: set sw=4 ts=4: */
3 * setconsole.c - redirect system console output
5 * Copyright (C) 2004,2005 Enrik Berkhan <Enrik.Berkhan@inka.de>
6 * Copyright (C) 2008 Bernhard Reutner-Fischer
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 //config:config SETCONSOLE
11 //config: bool "setconsole (3.7 kb)"
13 //config: select PLATFORM_LINUX
15 //config: Redirect writes to /dev/console to another device,
16 //config: like the current tty while logged in via telnet.
17 //config: This does not redirect kernel log, only writes
18 //config: from user space.
20 //config:config FEATURE_SETCONSOLE_LONG_OPTIONS
21 //config: bool "Enable long options"
23 //config: depends on SETCONSOLE && LONG_OPTS
25 //applet:IF_SETCONSOLE(APPLET_NOEXEC(setconsole, setconsole, BB_DIR_SBIN, BB_SUID_DROP, setconsole))
27 //kbuild:lib-$(CONFIG_SETCONSOLE) += setconsole.o
29 //usage:#define setconsole_trivial_usage
30 //usage: "[-r] [DEVICE]"
31 //usage:#define setconsole_full_usage "\n\n"
32 //usage: "Make writes to /dev/console appear on DEVICE (default: /dev/tty)."
33 //usage: "\n""Does not redirect kernel log output or reads from /dev/console."
35 //usage: "\n"" -r Reset: writes to /dev/console go to kernel log tty(s)"
37 /* It was a bbox-specific invention, but SUSE does have a similar utility.
38 * SUSE has no -r option, though.
43 int setconsole_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
44 int setconsole_main(int argc UNUSED_PARAM, char **argv)
46 const char *device = CURRENT_TTY;
49 /* at most one non-option argument */
50 reset = getopt32(argv, "^" "r" "\0" "?1");
60 //TODO: fails if TIOCCONS redir is already active to some tty.
61 //I think SUSE version first does TIOCCONS on /dev/console fd (iow: resets)
62 //then TIOCCONS to new tty?
63 xioctl(xopen(device, O_WRONLY), TIOCCONS, NULL);