source: branches/3.2/mindi-busybox/init/mesg.c @ 3186

Last change on this file since 3186 was 2725, checked in by bruno, 8 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
File size: 1.6 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * mesg implementation for busybox
4 *
5 * Copyright (c) 2002 Manuel Novoa III  <mjn3@codepoet.org>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 */
9
10//applet:IF_MESG(APPLET(mesg, _BB_DIR_USR_BIN, _BB_SUID_DROP))
11
12//kbuild:lib-$(CONFIG_MESG) += mesg.o
13
14//config:config MESG
15//config:   bool "mesg"
16//config:   default y
17//config:   help
18//config:     Mesg controls access to your terminal by others. It is typically
19//config:     used to allow or disallow other users to write to your terminal
20
21//usage:#define mesg_trivial_usage
22//usage:       "[y|n]"
23//usage:#define mesg_full_usage "\n\n"
24//usage:       "Control write access to your terminal\n"
25//usage:       "    y   Allow write access to your terminal\n"
26//usage:       "    n   Disallow write access to your terminal"
27
28#include "libbb.h"
29
30#ifdef USE_TTY_GROUP
31#define S_IWGRP_OR_S_IWOTH  S_IWGRP
32#else
33#define S_IWGRP_OR_S_IWOTH  (S_IWGRP | S_IWOTH)
34#endif
35
36int mesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
37int mesg_main(int argc UNUSED_PARAM, char **argv)
38{
39    struct stat sb;
40    const char *tty;
41    char c = 0;
42
43    argv++;
44
45    if (!argv[0]
46     || (!argv[1] && ((c = argv[0][0]) == 'y' || c == 'n'))
47    ) {
48        tty = xmalloc_ttyname(STDERR_FILENO);
49        if (tty == NULL) {
50            tty = "ttyname";
51        } else if (stat(tty, &sb) == 0) {
52            mode_t m;
53            if (c == 0) {
54                puts((sb.st_mode & (S_IWGRP|S_IWOTH)) ? "is y" : "is n");
55                return EXIT_SUCCESS;
56            }
57            m = (c == 'y') ? sb.st_mode | S_IWGRP_OR_S_IWOTH
58                           : sb.st_mode & ~(S_IWGRP|S_IWOTH);
59            if (chmod(tty, m) == 0) {
60                return EXIT_SUCCESS;
61            }
62        }
63        bb_simple_perror_msg_and_die(tty);
64    }
65    bb_show_usage();
66}
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