Annotation of src/usr.bin/mesg/mesg.c, Revision 1.6
1.6 ! deraadt 1: /* $OpenBSD: mesg.c,v 1.5 2003/06/03 02:56:13 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.
1.5 millert 21: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 22: * may be used to endorse or promote products derived from this software
23: * without specific prior written permission.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35: * SUCH DAMAGE.
36: */
37:
38: #ifndef lint
39: static char copyright[] =
40: "@(#) Copyright (c) 1987, 1993\n\
41: The Regents of the University of California. All rights reserved.\n";
42: #endif /* not lint */
43:
44: #ifndef lint
45: #if 0
46: static char sccsid[] = "@(#)mesg.c 8.2 (Berkeley) 1/21/94";
47: #endif
1.6 ! deraadt 48: static char rcsid[] = "$OpenBSD: mesg.c,v 1.5 2003/06/03 02:56:13 millert Exp $";
1.1 deraadt 49: #endif /* not lint */
50:
51: #include <sys/types.h>
52: #include <sys/stat.h>
53:
54: #include <err.h>
55: #include <errno.h>
56: #include <stdio.h>
57: #include <stdlib.h>
58: #include <string.h>
59: #include <unistd.h>
60:
61: int
1.6 ! deraadt 62: main(int argc, char *argv[])
1.1 deraadt 63: {
64: struct stat sb;
65: char *tty;
66: int ch;
67:
1.3 millert 68: while ((ch = getopt(argc, argv, "")) != -1)
1.1 deraadt 69: switch (ch) {
70: case '?':
71: default:
72: goto usage;
73: }
74: argc -= optind;
75: argv += optind;
76:
77: if ((tty = ttyname(STDERR_FILENO)) == NULL)
1.4 flipk 78: err(2, "ttyname");
1.1 deraadt 79: if (stat(tty, &sb) < 0)
1.4 flipk 80: err(2, "%s", tty);
1.1 deraadt 81:
82: if (*argv == NULL) {
83: if (sb.st_mode & S_IWGRP) {
84: (void)fprintf(stderr, "is y\n");
85: exit(0);
86: }
87: (void)fprintf(stderr, "is n\n");
88: exit(1);
89: }
90:
91: switch (*argv[0]) {
92: case 'y':
93: if (chmod(tty, sb.st_mode | S_IWGRP) < 0)
1.4 flipk 94: err(2, "%s", tty);
1.1 deraadt 95: exit(0);
96: case 'n':
97: if (chmod(tty, sb.st_mode & ~S_IWGRP) < 0)
1.4 flipk 98: err(2, "%s", tty);
1.1 deraadt 99: exit(1);
100: }
101:
102: usage: (void)fprintf(stderr, "usage: mesg [y | n]\n");
103: exit(2);
104: }