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