/* vi: set sw=4 ts=4: */
/*
- * setconsole.c - redirect system console output
+ * setconsole.c - redirect system console output
*
- * Copyright (C) 2004,2005 Enrik Berkhan <Enrik.Berkhan@inka.de>
+ * Copyright (C) 2004,2005 Enrik Berkhan <Enrik.Berkhan@inka.de>
+ * Copyright (C) 2008 Bernhard Reutner-Fischer
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config SETCONSOLE
+//config: bool "setconsole (3.6 kb)"
+//config: default y
+//config: select PLATFORM_LINUX
+//config: help
+//config: Redirect writes to /dev/console to another device,
+//config: like the current tty while logged in via telnet.
+//config: This does not redirect kernel log, only writes
+//config: from user space.
+//config:
+//config:config FEATURE_SETCONSOLE_LONG_OPTIONS
+//config: bool "Enable long options"
+//config: default y
+//config: depends on SETCONSOLE && LONG_OPTS
-#include <getopt.h>
-#include "libbb.h"
+//applet:IF_SETCONSOLE(APPLET_NOEXEC(setconsole, setconsole, BB_DIR_SBIN, BB_SUID_DROP, setconsole))
+
+//kbuild:lib-$(CONFIG_SETCONSOLE) += setconsole.o
+
+//usage:#define setconsole_trivial_usage
+//usage: "[-r] [DEVICE]"
+//usage:#define setconsole_full_usage "\n\n"
+//usage: "Make writes to /dev/console appear on DEVICE (default: /dev/tty)."
+//usage: "\n""Does not redirect kernel log output or reads from /dev/console."
+//usage: "\n"
+//usage: "\n"" -r Reset: writes to /dev/console go to kernel log tty(s)"
-#if ENABLE_FEATURE_SETCONSOLE_LONG_OPTIONS
-static const struct option setconsole_long_options[] = {
- { "reset", 0, NULL, 'r' },
- { 0, 0, 0, 0 }
-};
-#endif
+/* It was a bbox-specific invention, but SUSE does have a similar utility.
+ * SUSE has no -r option, though.
+ */
-#define OPT_SETCONS_RESET 1
+#include "libbb.h"
-int setconsole_main(int argc, char **argv);
-int setconsole_main(int argc, char **argv)
+int setconsole_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int setconsole_main(int argc UNUSED_PARAM, char **argv)
{
- unsigned long flags;
const char *device = CURRENT_TTY;
+ int reset;
-#if ENABLE_FEATURE_SETCONSOLE_LONG_OPTIONS
- applet_long_options = setconsole_long_options;
-#endif
- flags = getopt32(argc, argv, "r");
-
- if (argc - optind > 1)
- bb_show_usage();
+ /* at most one non-option argument */
+ reset = getopt32(argv, "^" "r" "\0" "?1");
- if (argc - optind == 1) {
- if (flags & OPT_SETCONS_RESET)
- bb_show_usage();
- device = argv[optind];
+ argv += 1 + reset;
+ if (*argv) {
+ device = *argv;
} else {
- if (flags & OPT_SETCONS_RESET)
+ if (reset)
device = DEV_CONSOLE;
}
- xioctl(xopen(device, O_RDONLY), TIOCCONS, NULL);
+//TODO: fails if TIOCCONS redir is already active to some tty.
+//I think SUSE version first does TIOCCONS on /dev/console fd (iow: resets)
+//then TIOCCONS to new tty?
+ xioctl(xopen(device, O_WRONLY), TIOCCONS, NULL);
return EXIT_SUCCESS;
}