67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* mesg implementation for busybox
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*
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* Copyright (c) 2002 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//applet:IF_MESG(APPLET(mesg, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_MESG) += mesg.o
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//config:config MESG
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//config: bool "mesg"
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//config: default y
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//config: help
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//config: Mesg controls access to your terminal by others. It is typically
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//config: used to allow or disallow other users to write to your terminal
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//usage:#define mesg_trivial_usage
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//usage: "[y|n]"
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//usage:#define mesg_full_usage "\n\n"
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//usage: "Control write access to your terminal\n"
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//usage: " y Allow write access to your terminal\n"
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//usage: " n Disallow write access to your terminal"
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#include "libbb.h"
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#ifdef USE_TTY_GROUP
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#define S_IWGRP_OR_S_IWOTH S_IWGRP
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#else
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#define S_IWGRP_OR_S_IWOTH (S_IWGRP | S_IWOTH)
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#endif
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int mesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int mesg_main(int argc UNUSED_PARAM, char **argv)
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{
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struct stat sb;
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const char *tty;
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char c = 0;
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argv++;
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if (!argv[0]
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|| (!argv[1] && ((c = argv[0][0]) == 'y' || c == 'n'))
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) {
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tty = xmalloc_ttyname(STDERR_FILENO);
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if (tty == NULL) {
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tty = "ttyname";
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} else if (stat(tty, &sb) == 0) {
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mode_t m;
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if (c == 0) {
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puts((sb.st_mode & (S_IWGRP|S_IWOTH)) ? "is y" : "is n");
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return EXIT_SUCCESS;
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}
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m = (c == 'y') ? sb.st_mode | S_IWGRP_OR_S_IWOTH
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: sb.st_mode & ~(S_IWGRP|S_IWOTH);
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if (chmod(tty, m) == 0) {
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return EXIT_SUCCESS;
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}
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}
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bb_simple_perror_msg_and_die(tty);
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}
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bb_show_usage();
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}
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