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* Copyright (c) 1987, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* Modified Fri Mar 10 20:27:19 1995, faith@cs.unc.edu, for Linux
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* Modified Mon Jul 1 18:14:10 1996, janl@ifi.uio.no, writing to stdout
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* as suggested by Michael Meskes <meskes@Informatik.RWTH-Aachen.DE>
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* 1999-02-22 Arkadiusz Mi�kiewicz <misiek@pld.ORG.PL>
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* - added Native Language Support
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* 2010-12-01 Marek Polacek <mmpolacek@gmail.com>
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#include <sys/types.h>
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#define IS_ALLOWED 0 /* Receiving messages is allowed. */
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#define IS_NOT_ALLOWED 1 /* Receiving messages is not allowed. */
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#define MESG_EXIT_FAILURE 2 /* An error occurred. */
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static void __attribute__ ((__noreturn__)) usage(FILE * out)
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fputs(_("\nUsage:\n"), out);
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_(" %s [options] [y | n]\n"), program_invocation_short_name);
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fputs(_("\nOptions:\n"), out);
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fputs(_(" -v, --verbose explain what is being done\n"
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" -V, --version output version information and exit\n"
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" -h, --help output help screen and exit\n\n"), out);
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exit(out == stderr ? MESG_EXIT_FAILURE : EXIT_SUCCESS);
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int main(int argc, char *argv[])
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int ch, verbose = FALSE;
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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static const struct option longopts[] = {
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{ "verbose", no_argument, 0, 'v' },
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{ "version", no_argument, 0, 'V' },
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{ "help", no_argument, 0, 'h' },
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while ((ch = getopt_long(argc, argv, "vVh", longopts, NULL)) != -1)
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printf(_("%s from %s\n"), program_invocation_short_name,
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if ((tty = ttyname(STDERR_FILENO)) == NULL)
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err(MESG_EXIT_FAILURE, _("ttyname failed"));
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if (stat(tty, &sb) < 0)
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err(MESG_EXIT_FAILURE, _("stat %s failed"), tty);
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if (sb.st_mode & (S_IWGRP | S_IWOTH)) {
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return IS_NOT_ALLOWED;
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if (chmod(tty, sb.st_mode | S_IWGRP) < 0)
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if (chmod(tty, sb.st_mode | S_IWGRP | S_IWOTH) < 0)
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err(MESG_EXIT_FAILURE, _("change %s mode failed"), tty);
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puts(_("write access to your terminal is allowed"));
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if (chmod(tty, sb.st_mode & ~(S_IWGRP|S_IWOTH)) < 0)
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err(MESG_EXIT_FAILURE, _("change %s mode failed"), tty);
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puts(_("write access to your terminal is denied"));
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return IS_NOT_ALLOWED;
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warnx(_("invalid argument: %c"), *argv[0]);