Annotation of src/usr.bin/mesg/mesg.c, Revision 1.1.1.1
1.1 deraadt 1: /* $NetBSD: mesg.c,v 1.4 1994/12/23 07:16:32 jtc Exp $ */
2:
3: /*
4: * Copyright (c) 1987, 1993
5: * The Regents of the University of California. All rights reserved.
6: * (c) UNIX System Laboratories, Inc.
7: * All or some portions of this file are derived from material licensed
8: * to the University of California by American Telephone and Telegraph
9: * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10: * the permission of UNIX System Laboratories, Inc.
11: *
12: * Redistribution and use in source and binary forms, with or without
13: * modification, are permitted provided that the following conditions
14: * are met:
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: * 2. Redistributions in binary form must reproduce the above copyright
18: * notice, this list of conditions and the following disclaimer in the
19: * documentation and/or other materials provided with the distribution.
20: * 3. All advertising materials mentioning features or use of this software
21: * must display the following acknowledgement:
22: * This product includes software developed by the University of
23: * California, Berkeley and its contributors.
24: * 4. Neither the name of the University nor the names of its contributors
25: * may be used to endorse or promote products derived from this software
26: * without specific prior written permission.
27: *
28: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38: * SUCH DAMAGE.
39: */
40:
41: #ifndef lint
42: static char copyright[] =
43: "@(#) Copyright (c) 1987, 1993\n\
44: The Regents of the University of California. All rights reserved.\n";
45: #endif /* not lint */
46:
47: #ifndef lint
48: #if 0
49: static char sccsid[] = "@(#)mesg.c 8.2 (Berkeley) 1/21/94";
50: #endif
51: static char rcsid[] = "$NetBSD: mesg.c,v 1.4 1994/12/23 07:16:32 jtc Exp $";
52: #endif /* not lint */
53:
54: #include <sys/types.h>
55: #include <sys/stat.h>
56:
57: #include <err.h>
58: #include <errno.h>
59: #include <stdio.h>
60: #include <stdlib.h>
61: #include <string.h>
62: #include <unistd.h>
63:
64: int
65: main(argc, argv)
66: int argc;
67: char *argv[];
68: {
69: struct stat sb;
70: char *tty;
71: int ch;
72:
73: while ((ch = getopt(argc, argv, "")) != EOF)
74: switch (ch) {
75: case '?':
76: default:
77: goto usage;
78: }
79: argc -= optind;
80: argv += optind;
81:
82: if ((tty = ttyname(STDERR_FILENO)) == NULL)
83: err(1, "ttyname");
84: if (stat(tty, &sb) < 0)
85: err(1, "%s", tty);
86:
87: if (*argv == NULL) {
88: if (sb.st_mode & S_IWGRP) {
89: (void)fprintf(stderr, "is y\n");
90: exit(0);
91: }
92: (void)fprintf(stderr, "is n\n");
93: exit(1);
94: }
95:
96: switch (*argv[0]) {
97: case 'y':
98: if (chmod(tty, sb.st_mode | S_IWGRP) < 0)
99: err(1, "%s", tty);
100: exit(0);
101: case 'n':
102: if (chmod(tty, sb.st_mode & ~S_IWGRP) < 0)
103: err(1, "%s", tty);
104: exit(1);
105: }
106:
107: usage: (void)fprintf(stderr, "usage: mesg [y | n]\n");
108: exit(2);
109: }