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6dbe3af9 | 1 | /* |
726f69e2 KZ |
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. | |
6dbe3af9 | 9 | * |
726f69e2 KZ |
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. | |
25 | * | |
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. | |
37 | * | |
38 | * Modified Fri Mar 10 20:27:19 1995, faith@cs.unc.edu, for Linux | |
fd6b7a7f KZ |
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> | |
726f69e2 | 41 | * |
6dbe3af9 | 42 | */ |
726f69e2 | 43 | |
726f69e2 | 44 | #include <sys/types.h> |
6dbe3af9 | 45 | #include <sys/stat.h> |
726f69e2 KZ |
46 | |
47 | #include <err.h> | |
6dbe3af9 | 48 | #include <errno.h> |
726f69e2 KZ |
49 | #include <stdio.h> |
50 | #include <stdlib.h> | |
51 | #include <string.h> | |
6dbe3af9 KZ |
52 | #include <unistd.h> |
53 | ||
726f69e2 KZ |
54 | int |
55 | main(argc, argv) | |
56 | int argc; | |
57 | char *argv[]; | |
6dbe3af9 | 58 | { |
726f69e2 KZ |
59 | struct stat sb; |
60 | char *tty; | |
61 | int ch; | |
62 | ||
63 | while ((ch = getopt(argc, argv, "")) != EOF) | |
64 | switch (ch) { | |
65 | case '?': | |
66 | default: | |
67 | goto usage; | |
68 | } | |
69 | argc -= optind; | |
70 | argv += optind; | |
71 | ||
72 | if ((tty = ttyname(STDERR_FILENO)) == NULL) | |
73 | err(1, "ttyname"); | |
74 | if (stat(tty, &sb) < 0) | |
75 | err(1, "%s", tty); | |
76 | ||
77 | if (*argv == NULL) { | |
78 | if (sb.st_mode & (S_IWGRP | S_IWOTH)) { | |
fd6b7a7f | 79 | (void)fprintf(stdout, "is y\n"); |
726f69e2 KZ |
80 | exit(0); |
81 | } | |
fd6b7a7f | 82 | (void)fprintf(stdout, "is n\n"); |
726f69e2 KZ |
83 | exit(1); |
84 | } | |
85 | ||
86 | switch (*argv[0]) { | |
87 | case 'y': | |
88 | #ifdef USE_TTY_GROUP | |
89 | if (chmod(tty, sb.st_mode | S_IWGRP) < 0) | |
90 | err(1, "%s", tty); | |
91 | #else | |
92 | if (chmod(tty, sb.st_mode | S_IWGRP | S_IWOTH) < 0) | |
93 | err(1, "%s", tty); | |
94 | #endif | |
95 | exit(0); | |
96 | case 'n': | |
97 | if (chmod(tty, sb.st_mode & ~(S_IWGRP|S_IWOTH)) < 0) | |
98 | err(1, "%s", tty); | |
99 | exit(1); | |
100 | } | |
101 | ||
102 | usage: (void)fprintf(stderr, "usage: mesg [y | n]\n"); | |
103 | exit(2); | |
6dbe3af9 | 104 | } |