setlogcons, from Jan Kaszka.

console-tools/Config.in

@@ -72,4 +72,10 @@ config CONFIG_SETKEYCODES
 	  This program loads entries into the kernel's scancode-to-keycode
 	  map, allowing unusual keyboards to generate usable keycodes.
 
+config CONFIG_SETLOGCONS
+	bool "setlogcons"
+	default n
+	help
+	  This program redirects the output console of kernel messages.
+
 endmenu

console-tools/Makefile.in

@@ -21,6 +21,7 @@ CONSOLETOOLS-$(CONFIG_LOADKMAP)	+= loadkmap.o
 CONSOLETOOLS-$(CONFIG_OPENVT)	+= openvt.o
 CONSOLETOOLS-$(CONFIG_RESET)	+= reset.o
 CONSOLETOOLS-$(CONFIG_SETKEYCODES)	+= setkeycodes.o
+CONSOLETOOLS-$(CONFIG_SETLOGCONS)	+= setlogcons.o
 
 ifneq ($(strip $(CONSOLETOOLS-y)),)
 libraries-y+=$(CONSOLETOOLS_DIR)$(CONSOLETOOLS_AR)

console-tools/setlogcons.c

@@ -0,0 +1,34 @@
+/*
+ * 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 tarball for details.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include "busybox.h"
+
+extern int setlogcons_main(int argc, char **argv)
+{
+	struct {
+		char fn;
+		char subarg;
+	} arg;
+
+	arg.fn = 11;    /* redirect kernel messages */
+	arg.subarg = 0; /* to specified console (current as default) */
+
+	if (argc == 2)
+		arg.subarg = atoi(argv[1]);
+
+	if (ioctl(bb_xopen("/dev/tty1", O_RDONLY), TIOCLINUX, &arg))
+		bb_perror_msg_and_die("TIOCLINUX");;
+
+	return 0;
+}

include/applets.h

@@ -235,6 +235,7 @@ USE_SEQ(APPLET(seq, seq_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_SETARCH(APPLET(setarch, setarch_main, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_SETCONSOLE(APPLET(setconsole, setconsole_main, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_SETKEYCODES(APPLET(setkeycodes, setkeycodes_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_SETLOGCONS(APPLET(setlogcons, setlogcons_main, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_SETSID(APPLET(setsid, setsid_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_FEATURE_SH_IS_ASH(APPLET_NOUSAGE(sh, ash_main, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_FEATURE_SH_IS_HUSH(APPLET_NOUSAGE(sh, hush_main, _BB_DIR_BIN, _BB_SUID_NEVER))

include/usage.h

@@ -2648,6 +2648,11 @@
 #define setkeycodes_example_usage \
 	"$ setkeycodes e030 127\n"
 
+#define setlogcons_trivial_usage \
+	"N"
+#define setlogcons_full_usage \
+	"Redirects the kernel output to console N (0 for current)."
+
 #define setsid_trivial_usage \
 	"program [arg ...]"
 #define setsid_full_usage \