biff.c revision 87628
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 87628 2001-12-10 21:13:08Z dwmalone $"); 48 49#include <sys/types.h> 50#include <sys/stat.h> 51#include <errno.h> 52#include <unistd.h> 53#include <stdio.h> 54#include <stdlib.h> 55#include <string.h> 56#include <err.h> 57 58static void usage __P((void)); 59 60int 61main(argc, argv) 62 int argc; 63 char *argv[]; 64{ 65 struct stat sb; 66 int ch; 67 char *name; 68 69 70 while ((ch = getopt(argc, argv, "")) != -1) 71 switch(ch) { 72 case '?': 73 default: 74 usage(); 75 } 76 argc -= optind; 77 argv += optind; 78 79 if ((name = ttyname(STDERR_FILENO)) == NULL) 80 err(2, "unknown tty"); 81 82 if (stat(name, &sb)) 83 err(2, "stat"); 84 85 if (*argv == NULL) { 86 (void)printf("is %s\n", sb.st_mode & S_IXUSR ? "y" : "n"); 87 return(sb.st_mode & S_IXUSR ? 0 : 1); 88 } 89 90 switch(argv[0][0]) { 91 case 'n': 92 if (chmod(name, sb.st_mode & ~S_IXUSR) < 0) 93 err(2, "%s", name); 94 break; 95 case 'y': 96 if (chmod(name, sb.st_mode | S_IXUSR) < 0) 97 err(2, "%s", name); 98 break; 99 default: 100 usage(); 101 } 102 return(sb.st_mode & S_IXUSR ? 0 : 1); 103} 104 105static void 106usage() 107{ 108 (void)fprintf(stderr, "usage: biff [y | n]\n"); 109 exit(2); 110} 111