| /* vi: set sw=4 ts=4: */ |
| /* |
| * setconsole.c - redirect system console output |
| * |
| * Copyright (C) 2004,2005 Enrik Berkhan <Enrik.Berkhan@inka.de> |
| * Copyright (C) 2008 Bernhard Reutner-Fischer |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| //config:config SETCONSOLE |
| //config: bool "setconsole (3.7 kb)" |
| //config: default y |
| //config: select PLATFORM_LINUX |
| //config: help |
| //config: Redirect writes to /dev/console to another device, |
| //config: like the current tty while logged in via telnet. |
| //config: This does not redirect kernel log, only writes |
| //config: from user space. |
| //config: |
| //config:config FEATURE_SETCONSOLE_LONG_OPTIONS |
| //config: bool "Enable long options" |
| //config: default y |
| //config: depends on SETCONSOLE && LONG_OPTS |
| |
| //applet:IF_SETCONSOLE(APPLET_NOEXEC(setconsole, setconsole, BB_DIR_SBIN, BB_SUID_DROP, setconsole)) |
| |
| //kbuild:lib-$(CONFIG_SETCONSOLE) += setconsole.o |
| |
| //usage:#define setconsole_trivial_usage |
| //usage: "[-r] [DEVICE]" |
| //usage:#define setconsole_full_usage "\n\n" |
| //usage: "Make writes to /dev/console appear on DEVICE (default: /dev/tty)." |
| //usage: "\n""Does not redirect kernel log output or reads from /dev/console." |
| //usage: "\n" |
| //usage: "\n"" -r Reset: writes to /dev/console go to kernel log tty(s)" |
| |
| /* It was a bbox-specific invention, but SUSE does have a similar utility. |
| * SUSE has no -r option, though. |
| */ |
| |
| #include "libbb.h" |
| |
| int setconsole_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int setconsole_main(int argc UNUSED_PARAM, char **argv) |
| { |
| const char *device = CURRENT_TTY; |
| int reset; |
| |
| /* at most one non-option argument */ |
| reset = getopt32(argv, "^" "r" "\0" "?1"); |
| |
| argv += 1 + reset; |
| if (*argv) { |
| device = *argv; |
| } else { |
| if (reset) |
| device = DEV_CONSOLE; |
| } |
| |
| //TODO: fails if TIOCCONS redir is already active to some tty. |
| //I think SUSE version first does TIOCCONS on /dev/console fd (iow: resets) |
| //then TIOCCONS to new tty? |
| xioctl(xopen(device, O_WRONLY), TIOCCONS, NULL); |
| return EXIT_SUCCESS; |
| } |