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git.ipfire.org Git - thirdparty/util-linux.git/blob - login-utils/mesg.c
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>
45 static char copyright
[] =
46 "@(#) Copyright (c) 1987, 1993\n\
47 The Regents of the University of California. All rights reserved.\n";
51 static char sccsid
[] = "@(#)mesg.c 8.2 (Berkeley) 1/21/94";
54 #include <sys/types.h>
73 while ((ch
= getopt(argc
, argv
, "")) != EOF
)
82 if ((tty
= ttyname(STDERR_FILENO
)) == NULL
)
84 if (stat(tty
, &sb
) < 0)
88 if (sb
.st_mode
& (S_IWGRP
| S_IWOTH
)) {
89 (void)fprintf(stdout
, "is y\n");
92 (void)fprintf(stdout
, "is n\n");
99 if (chmod(tty
, sb
.st_mode
| S_IWGRP
) < 0)
102 if (chmod(tty
, sb
.st_mode
| S_IWGRP
| S_IWOTH
) < 0)
107 if (chmod(tty
, sb
.st_mode
& ~(S_IWGRP
|S_IWOTH
)) < 0)
112 usage
: (void)fprintf(stderr
, "usage: mesg [y | n]\n");