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