busybox/console-tools/setlogcons.c

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/* vi: set sw=4 ts=4: */
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/*
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* setlogcons: Send kernel messages to the current console or to console N
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*
* 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.
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*/
//config:config SETLOGCONS
//config: bool "setlogcons"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: This program redirects the output console of kernel messages.
//applet:IF_SETLOGCONS(APPLET(setlogcons, BB_DIR_USR_SBIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_SETLOGCONS) += setlogcons.o
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//usage:#define setlogcons_trivial_usage
//usage: "[N]"
//usage:#define setlogcons_full_usage "\n\n"
//usage: "Redirect the kernel output to console N. Default:0 (current console)"
#include "libbb.h"
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int setlogcons_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int setlogcons_main(int argc UNUSED_PARAM, char **argv)
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{
struct {
char fn;
char subarg;
} arg = {
11, /* redirect kernel messages */
0 /* to specified console (current as default) */
};
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if (argv[1])
arg.subarg = xatou_range(argv[1], 0, 63);
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xioctl(xopen(VC_1, O_RDONLY), TIOCLINUX, &arg);
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return EXIT_SUCCESS;
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}