Annotation of src/usr.bin/mesg/mesg.c, Revision 1.4
1.4 ! flipk 1: /* $OpenBSD: mesg.c,v 1.3 1997/01/15 23:42:53 millert Exp $ */
1.1 deraadt 2: /* $NetBSD: mesg.c,v 1.4 1994/12/23 07:16:32 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1987, 1993
6: * The Regents of the University of California. All rights reserved.
7: * (c) UNIX System Laboratories, Inc.
8: * All or some portions of this file are derived from material licensed
9: * to the University of California by American Telephone and Telegraph
10: * Co. or Unix System Laboratories, Inc. and are reproduced herein with
11: * the permission of UNIX System Laboratories, Inc.
12: *
13: * Redistribution and use in source and binary forms, with or without
14: * modification, are permitted provided that the following conditions
15: * are met:
16: * 1. Redistributions of source code must retain the above copyright
17: * notice, this list of conditions and the following disclaimer.
18: * 2. Redistributions in binary form must reproduce the above copyright
19: * notice, this list of conditions and the following disclaimer in the
20: * documentation and/or other materials provided with the distribution.
21: * 3. All advertising materials mentioning features or use of this software
22: * must display the following acknowledgement:
23: * This product includes software developed by the University of
24: * California, Berkeley and its contributors.
25: * 4. Neither the name of the University nor the names of its contributors
26: * may be used to endorse or promote products derived from this software
27: * without specific prior written permission.
28: *
29: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39: * SUCH DAMAGE.
40: */
41:
42: #ifndef lint
43: static char copyright[] =
44: "@(#) Copyright (c) 1987, 1993\n\
45: The Regents of the University of California. All rights reserved.\n";
46: #endif /* not lint */
47:
48: #ifndef lint
49: #if 0
50: static char sccsid[] = "@(#)mesg.c 8.2 (Berkeley) 1/21/94";
51: #endif
1.4 ! flipk 52: static char rcsid[] = "$OpenBSD: mesg.c,v 1.3 1997/01/15 23:42:53 millert Exp $";
1.1 deraadt 53: #endif /* not lint */
54:
55: #include <sys/types.h>
56: #include <sys/stat.h>
57:
58: #include <err.h>
59: #include <errno.h>
60: #include <stdio.h>
61: #include <stdlib.h>
62: #include <string.h>
63: #include <unistd.h>
64:
65: int
66: main(argc, argv)
67: int argc;
68: char *argv[];
69: {
70: struct stat sb;
71: char *tty;
72: int ch;
73:
1.3 millert 74: while ((ch = getopt(argc, argv, "")) != -1)
1.1 deraadt 75: switch (ch) {
76: case '?':
77: default:
78: goto usage;
79: }
80: argc -= optind;
81: argv += optind;
82:
83: if ((tty = ttyname(STDERR_FILENO)) == NULL)
1.4 ! flipk 84: err(2, "ttyname");
1.1 deraadt 85: if (stat(tty, &sb) < 0)
1.4 ! flipk 86: err(2, "%s", tty);
1.1 deraadt 87:
88: if (*argv == NULL) {
89: if (sb.st_mode & S_IWGRP) {
90: (void)fprintf(stderr, "is y\n");
91: exit(0);
92: }
93: (void)fprintf(stderr, "is n\n");
94: exit(1);
95: }
96:
97: switch (*argv[0]) {
98: case 'y':
99: if (chmod(tty, sb.st_mode | S_IWGRP) < 0)
1.4 ! flipk 100: err(2, "%s", tty);
1.1 deraadt 101: exit(0);
102: case 'n':
103: if (chmod(tty, sb.st_mode & ~S_IWGRP) < 0)
1.4 ! flipk 104: err(2, "%s", tty);
1.1 deraadt 105: exit(1);
106: }
107:
108: usage: (void)fprintf(stderr, "usage: mesg [y | n]\n");
109: exit(2);
110: }