test utilities - eatmem.c - Change size parameter from int to size_t
[dragonfly.git] / usr.bin / mesg / mesg.c
blob0f8fe0d5823708b5be005a0f5323b5c505dc99a8
1 /*
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
12 * are met:
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
36 * SUCH DAMAGE.
38 * @(#) Copyright (c) 1987, 1993 The Regents of the University of California. All rights reserved.
39 * @(#)mesg.c 8.2 (Berkeley) 1/21/94
40 * $FreeBSD: src/usr.bin/mesg/mesg.c,v 1.4 1999/08/28 01:03:59 peter Exp $
41 * $DragonFly: src/usr.bin/mesg/mesg.c,v 1.5 2005/03/04 10:34:39 liamfoy Exp $
44 #include <sys/types.h>
45 #include <sys/stat.h>
47 #include <err.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <unistd.h>
52 static void usage(void);
54 int
55 main(int argc, char **argv)
57 struct stat sb;
58 char *tty;
59 int ch;
61 while ((ch = getopt(argc, argv, "")) != -1)
62 switch (ch) {
63 case '?':
64 default:
65 usage();
67 argc -= optind;
68 argv += optind;
70 if ((tty = ttyname(STDIN_FILENO)) == NULL &&
71 (tty = ttyname(STDOUT_FILENO)) == NULL &&
72 (tty = ttyname(STDERR_FILENO)) == NULL)
73 err(2, "ttyname failed");
74 if (stat(tty, &sb) < 0)
75 err(2, "%s", tty);
77 if (*argv == NULL) {
78 if (sb.st_mode & S_IWGRP) {
79 fprintf(stdout, "is y\n");
80 exit(0);
82 fprintf(stdout, "is n\n");
83 exit(1);
86 switch (*argv[0]) {
87 case 'y':
88 if (chmod(tty, sb.st_mode | S_IWGRP) < 0)
89 err(2, "%s", tty);
90 exit(0);
91 case 'n':
92 if (chmod(tty, sb.st_mode & ~S_IWGRP) < 0)
93 err(2, "%s", tty);
94 exit(1);
97 usage();
98 return(0);
101 static void
102 usage(void)
104 fprintf(stderr, "usage: mesg [y | n]\n");
105 exit(2);