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https://git.busybox.net/busybox.git
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59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include "busybox.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[])
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{
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struct stat sb;
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char *tty;
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char c = 0;
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if ((--argc == 0)
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|| ((argc == 1) && (((c = **++argv) == 'y') || (c == 'n')))) {
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if ((tty = ttyname(STDERR_FILENO)) == NULL) {
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tty = "ttyname";
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} else if (stat(tty, &sb) == 0) {
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if (argc == 0) {
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puts(((sb.st_mode & (S_IWGRP | S_IWOTH)) ==
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0) ? "is n" : "is y");
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return EXIT_SUCCESS;
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}
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if (chmod
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(tty,
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(c ==
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'y') ? sb.st_mode | (S_IWGRP_OR_S_IWOTH) : sb.
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st_mode & ~(S_IWGRP | S_IWOTH)) == 0) {
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return EXIT_SUCCESS;
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}
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}
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bb_perror_msg_and_die("%s", tty);
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}
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bb_show_usage();
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}
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