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"Robert P. J. Day"63fc1a92006-07-02 19:47:05 +00001/* vi: set sw=4 ts=4: */
Rob Landley87848d92006-03-27 23:23:43 +00002/*
Denis Vlasenko9213a9e2006-09-17 16:28:10 +00003 * setlogcons: Send kernel messages to the current console or to console N
Rob Landley87848d92006-03-27 23:23:43 +00004 *
5 * Copyright (C) 2006 by Jan Kiszka <jan.kiszka@web.de>
6 *
7 * Based on setlogcons (kbd-1.12) by Andries E. Brouwer
8 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02009 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
Rob Landley87848d92006-03-27 23:23:43 +000010 */
Denys Vlasenko6d932992016-11-23 10:39:27 +010011//config:config SETLOGCONS
Denys Vlasenko4eed2c62017-07-18 22:01:24 +020012//config: bool "setlogcons (1.8 kb)"
Denys Vlasenko6d932992016-11-23 10:39:27 +010013//config: default y
14//config: select PLATFORM_LINUX
15//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +020016//config: This program redirects the output console of kernel messages.
Denys Vlasenko6d932992016-11-23 10:39:27 +010017
Denys Vlasenko341ce0a2017-08-06 18:17:58 +020018//applet:IF_SETLOGCONS(APPLET_NOEXEC(setlogcons, setlogcons, BB_DIR_USR_SBIN, BB_SUID_DROP, setlogcons))
Denys Vlasenko6d932992016-11-23 10:39:27 +010019
20//kbuild:lib-$(CONFIG_SETLOGCONS) += setlogcons.o
Rob Landley87848d92006-03-27 23:23:43 +000021
Pere Orga55068c42011-03-27 23:42:28 +020022//usage:#define setlogcons_trivial_usage
Denys Vlasenko6e177662014-07-04 13:58:57 +020023//usage: "[N]"
Pere Orga55068c42011-03-27 23:42:28 +020024//usage:#define setlogcons_full_usage "\n\n"
Denys Vlasenko341ce0a2017-08-06 18:17:58 +020025//usage: "Pin kernel output to VT console N. Default:0 (do not pin)"
26
27// Comment from kernel source:
28/* ...
29 * By default, the kernel messages are always printed on the current virtual
30 * console. However, the user may modify that default with the
31 * TIOCL_SETKMSGREDIRECT ioctl call.
32 *
33 * This function sets the kernel message console to be @new. It returns the old
34 * virtual console number. The virtual terminal number 0 (both as parameter and
35 * return value) means no redirection (i.e. always printed on the currently
36 * active console).
37 */
Pere Orga55068c42011-03-27 23:42:28 +020038
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000039#include "libbb.h"
Rob Landley87848d92006-03-27 23:23:43 +000040
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +000041int setlogcons_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000042int setlogcons_main(int argc UNUSED_PARAM, char **argv)
Rob Landley87848d92006-03-27 23:23:43 +000043{
44 struct {
45 char fn;
46 char subarg;
Denys Vlasenko69675782013-01-14 01:34:48 +010047 } arg = {
Denys Vlasenko341ce0a2017-08-06 18:17:58 +020048 11, /* redirect kernel messages (TIOCL_SETKMSGREDIRECT) */
49 0
Denys Vlasenko69675782013-01-14 01:34:48 +010050 };
Rob Landley87848d92006-03-27 23:23:43 +000051
Denis Vlasenko1d426652008-03-17 09:09:09 +000052 if (argv[1])
53 arg.subarg = xatou_range(argv[1], 0, 63);
Rob Landley87848d92006-03-27 23:23:43 +000054
Denis Vlasenkofb79a2e2007-07-14 22:07:14 +000055 xioctl(xopen(VC_1, O_RDONLY), TIOCLINUX, &arg);
Rob Landley87848d92006-03-27 23:23:43 +000056
Bernhard Reutner-Fischerae4342c2008-05-19 08:18:50 +000057 return EXIT_SUCCESS;
Rob Landley87848d92006-03-27 23:23:43 +000058}