setconsole: open console for writing rather than reading
[oweals/busybox.git] / 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
11 //usage:#define setconsole_trivial_usage
12 //usage:       "[-r" IF_FEATURE_SETCONSOLE_LONG_OPTIONS("|--reset") "] [DEVICE]"
13 //usage:#define setconsole_full_usage "\n\n"
14 //usage:       "Redirect system console output to DEVICE (default: /dev/tty)\n"
15 //usage:     "\nOptions:"
16 //usage:     "\n        -r      Reset output to /dev/console"
17
18 #include "libbb.h"
19
20 int setconsole_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
21 int setconsole_main(int argc UNUSED_PARAM, char **argv)
22 {
23         const char *device = CURRENT_TTY;
24         bool reset;
25
26 #if ENABLE_FEATURE_SETCONSOLE_LONG_OPTIONS
27         static const char setconsole_longopts[] ALIGN1 =
28                 "reset\0" No_argument "r"
29                 ;
30         applet_long_options = setconsole_longopts;
31 #endif
32         /* at most one non-option argument */
33         opt_complementary = "?1";
34         reset = getopt32(argv, "r");
35
36         argv += 1 + reset;
37         if (*argv) {
38                 device = *argv;
39         } else {
40                 if (reset)
41                         device = DEV_CONSOLE;
42         }
43
44         xioctl(xopen(device, O_WRONLY), TIOCCONS, NULL);
45         return EXIT_SUCCESS;
46 }