2 * Copyright (c) 1987, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * Modified Fri Mar 10 20:27:19 1995, faith@cs.unc.edu, for Linux
39 * Modified Mon Jul 1 18:14:10 1996, janl@ifi.uio.no, writing to stdout
40 * as suggested by Michael Meskes <meskes@Informatik.RWTH-Aachen.DE>
42 * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
43 * - added Native Language Support
45 * 2010-12-01 Marek Polacek <mmpolacek@gmail.com>
54 #include <sys/types.h>
62 #define IS_ALLOWED 0 /* Receiving messages is allowed. */
63 #define IS_NOT_ALLOWED 1 /* Receiving messages is not allowed. */
64 #define MESG_EXIT_FAILURE 2 /* An error occurred. */
66 static void __attribute__ ((__noreturn__)) usage(FILE * out)
68 fputs(_("\nUsage:\n"), out);
70 _(" %s [options] [y | n]\n"), program_invocation_short_name);
72 fputs(_("\nOptions:\n"), out);
73 fputs(_(" -v, --verbose explain what is being done\n"
74 " -V, --version output version information and exit\n"
75 " -h, --help output help screen and exit\n\n"), out);
77 exit(out == stderr ? MESG_EXIT_FAILURE : EXIT_SUCCESS);
80 int main(int argc, char *argv[])
84 int ch, verbose = FALSE;
86 setlocale(LC_ALL, "");
87 bindtextdomain(PACKAGE, LOCALEDIR);
90 static const struct option longopts[] = {
91 { "verbose", no_argument, 0, 'v' },
92 { "version", no_argument, 0, 'V' },
93 { "help", no_argument, 0, 'h' },
97 while ((ch = getopt_long(argc, argv, "vVh", longopts, NULL)) != -1)
103 printf(_("%s from %s\n"), program_invocation_short_name,
115 if ((tty = ttyname(STDERR_FILENO)) == NULL)
116 err(MESG_EXIT_FAILURE, _("ttyname failed"));
118 if (stat(tty, &sb) < 0)
119 err(MESG_EXIT_FAILURE, _("stat %s failed"), tty);
122 if (sb.st_mode & (S_IWGRP | S_IWOTH)) {
127 return IS_NOT_ALLOWED;
133 if (chmod(tty, sb.st_mode | S_IWGRP) < 0)
135 if (chmod(tty, sb.st_mode | S_IWGRP | S_IWOTH) < 0)
137 err(MESG_EXIT_FAILURE, _("change %s mode failed"), tty);
139 puts(_("write access to your terminal is allowed"));
142 if (chmod(tty, sb.st_mode & ~(S_IWGRP|S_IWOTH)) < 0)
143 err(MESG_EXIT_FAILURE, _("change %s mode failed"), tty);
145 puts(_("write access to your terminal is denied"));
146 return IS_NOT_ALLOWED;
148 warnx(_("invalid argument: %c"), *argv[0]);