LXR busybox/console-tools/setconsole.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 *  setconsole.c - redirect system console output
   4 *
   5 *  Copyright (C) 2004,2005  Enrik Berkhan <Enrik.Berkhan@inka.de>
   6 *  Copyright (C) 2008 Bernhard Reutner-Fischer
   7 *
   8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   9 */
  10//config:config SETCONSOLE
  11//config:       bool "setconsole"
  12//config:       default y
  13//config:       select PLATFORM_LINUX
  14//config:       help
  15//config:         This program redirects the system console to another device,
  16//config:         like the current tty while logged in via telnet.
  17//config:
  18//config:config FEATURE_SETCONSOLE_LONG_OPTIONS
  19//config:       bool "Enable long options"
  20//config:       default y
  21//config:       depends on SETCONSOLE && LONG_OPTS
  22//config:       help
  23//config:         Support long options for the setconsole applet.
  24
  25//applet:IF_SETCONSOLE(APPLET(setconsole, BB_DIR_SBIN, BB_SUID_DROP))
  26
  27//kbuild:lib-$(CONFIG_SETCONSOLE) += setconsole.o
  28
  29//usage:#define setconsole_trivial_usage
  30//usage:       "[-r" IF_FEATURE_SETCONSOLE_LONG_OPTIONS("|--reset") "] [DEVICE]"
  31//usage:#define setconsole_full_usage "\n\n"
  32//usage:       "Redirect system console output to DEVICE (default: /dev/tty)\n"
  33//usage:     "\n        -r      Reset output to /dev/console"
  34
  35#include "libbb.h"
  36
  37int setconsole_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  38int setconsole_main(int argc UNUSED_PARAM, char **argv)
  39{
  40        const char *device = CURRENT_TTY;
  41        bool reset;
  42
  43#if ENABLE_FEATURE_SETCONSOLE_LONG_OPTIONS
  44        static const char setconsole_longopts[] ALIGN1 =
  45                "reset\0" No_argument "r"
  46                ;
  47        applet_long_options = setconsole_longopts;
  48#endif
  49        /* at most one non-option argument */
  50        opt_complementary = "?1";
  51        reset = getopt32(argv, "r");
  52
  53        argv += 1 + reset;
  54        if (*argv) {
  55                device = *argv;
  56        } else {
  57                if (reset)
  58                        device = DEV_CONSOLE;
  59        }
  60
  61        xioctl(xopen(device, O_WRONLY), TIOCCONS, NULL);
  62        return EXIT_SUCCESS;
  63}
  64