biff.c revision 90722
1/* 2 * Copyright (c) 1980, 1993 3 * The Regents of the University of California. 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 35static const char copyright[] = 36"@(#) Copyright (c) 1980, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif 39 40#if 0 41#ifndef lint 42static char sccsid[] = "@(#)biff.c 8.1 (Berkeley) 6/6/93"; 43#endif 44#endif 45 46#include <sys/cdefs.h> 47__FBSDID("$FreeBSD: head/usr.bin/biff/biff.c 90722 2002-02-16 09:25:49Z mike $"); 48 49#include <sys/stat.h> 50 51#include <err.h> 52#include <stdio.h> 53#include <stdlib.h> 54#include <unistd.h> 55 56static void usage __P((void)); 57 58int 59main(argc, argv) 60 int argc; 61 char *argv[]; 62{ 63 struct stat sb; 64 int ch; 65 char *name; 66 67 68 while ((ch = getopt(argc, argv, "")) != -1) 69 switch(ch) { 70 case '?': 71 default: 72 usage(); 73 } 74 argc -= optind; 75 argv += optind; 76 77 if ((name = ttyname(STDERR_FILENO)) == NULL) 78 err(2, "unknown tty"); 79 80 if (stat(name, &sb)) 81 err(2, "stat"); 82 83 if (*argv == NULL) { 84 (void)printf("is %s\n", sb.st_mode & S_IXUSR ? "y" : "n"); 85 return(sb.st_mode & S_IXUSR ? 0 : 1); 86 } 87 88 switch(argv[0][0]) { 89 case 'n': 90 if (chmod(name, sb.st_mode & ~S_IXUSR) < 0) 91 err(2, "%s", name); 92 break; 93 case 'y': 94 if (chmod(name, sb.st_mode | S_IXUSR) < 0) 95 err(2, "%s", name); 96 break; 97 default: 98 usage(); 99 } 100 return(sb.st_mode & S_IXUSR ? 0 : 1); 101} 102 103static void 104usage() 105{ 106 (void)fprintf(stderr, "usage: biff [y | n]\n"); 107 exit(2); 108} 109