| /* vi: set sw=4 ts=4: */ |
| /* |
| * setlogcons: Send kernel messages to the current console or to console N |
| * |
| * Copyright (C) 2006 by Jan Kiszka <jan.kiszka@web.de> |
| * |
| * Based on setlogcons (kbd-1.12) by Andries E. Brouwer |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| //config:config SETLOGCONS |
| //config: bool "setlogcons (1.8 kb)" |
| //config: default y |
| //config: select PLATFORM_LINUX |
| //config: help |
| //config: This program redirects the output console of kernel messages. |
| |
| //applet:IF_SETLOGCONS(APPLET_NOEXEC(setlogcons, setlogcons, BB_DIR_USR_SBIN, BB_SUID_DROP, setlogcons)) |
| |
| //kbuild:lib-$(CONFIG_SETLOGCONS) += setlogcons.o |
| |
| //usage:#define setlogcons_trivial_usage |
| //usage: "[N]" |
| //usage:#define setlogcons_full_usage "\n\n" |
| //usage: "Pin kernel output to VT console N. Default:0 (do not pin)" |
| |
| // Comment from kernel source: |
| /* ... |
| * By default, the kernel messages are always printed on the current virtual |
| * console. However, the user may modify that default with the |
| * TIOCL_SETKMSGREDIRECT ioctl call. |
| * |
| * This function sets the kernel message console to be @new. It returns the old |
| * virtual console number. The virtual terminal number 0 (both as parameter and |
| * return value) means no redirection (i.e. always printed on the currently |
| * active console). |
| */ |
| |
| #include "libbb.h" |
| |
| int setlogcons_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int setlogcons_main(int argc UNUSED_PARAM, char **argv) |
| { |
| struct { |
| char fn; |
| char subarg; |
| } arg = { |
| 11, /* redirect kernel messages (TIOCL_SETKMSGREDIRECT) */ |
| 0 |
| }; |
| |
| if (argv[1]) |
| arg.subarg = xatou_range(argv[1], 0, 63); |
| |
| xioctl(xopen(VC_1, O_RDONLY), TIOCLINUX, &arg); |
| |
| return EXIT_SUCCESS; |
| } |