biff.c revision 1.2 
1/*
2 * Copyright (c) 1980 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35char copyright[] =
36"@(#) Copyright (c) 1980 The Regents of the University of California.\n\
37 All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41/*static char sccsid[] = "from: @(#)biff.c	5.3 (Berkeley) 6/1/90";*/
42static char rcsid[] = "$Id: biff.c,v 1.2 1993/08/01 18:18:20 mycroft Exp $";
43#endif /* not lint */
44
45/*
46 * biff
47 */
48#include <sys/types.h>
49#include <sys/stat.h>
50#include <stdio.h>
51
52char	*ttyname();
53
54main(argc, argv)
55	int argc;
56	char **argv;
57{
58	char *cp = ttyname(2);
59	struct stat stb;
60
61	argc--, argv++;
62	if (cp == 0)
63		fprintf(stderr, "Where are you?\n"), exit(1);
64	if (stat(cp, &stb) < 0)
65		perror(cp), exit(1);
66	if (argc == 0) {
67		printf("is %s\n", stb.st_mode&0100 ? "y" : "n");
68		exit((stb.st_mode&0100) ? 0 : 1);
69	}
70	switch (argv[0][0]) {
71
72	case 'y':
73		if (chmod(cp, stb.st_mode|0100) < 0)
74			perror(cp);
75		break;
76
77	case 'n':
78		if (chmod(cp, stb.st_mode&~0100) < 0)
79			perror(cp);
80		break;
81
82	default:
83		fprintf(stderr, "usage: biff [y] [n]\n");
84	}
85	exit((stb.st_mode&0100) ? 0 : 1);
86}
87