1 /* $FreeBSD: src/lib/libstand/nullfs.c,v 1.3.2.1 2000/05/04 13:47:51 ps Exp $ */ 2 /* $DragonFly: src/lib/libstand/nullfs.c,v 1.3 2005/12/11 02:27:26 swildner Exp $ */ 3 /* $NetBSD: nullfs.c,v 1.1 1996/01/13 22:25:39 leo Exp $ */ 4 5 /*- 6 * Copyright (c) 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * The Mach Operating System project at Carnegie-Mellon University. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)open.c 8.1 (Berkeley) 6/11/93 37 * 38 * 39 * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University 40 * All Rights Reserved. 41 * 42 * Author: Alessandro Forin 43 * 44 * Permission to use, copy, modify and distribute this software and its 45 * documentation is hereby granted, provided that both the copyright 46 * notice and this permission notice appear in all copies of the 47 * software, derivative works or modified versions, and any portions 48 * thereof, and that both notices appear in supporting documentation. 49 * 50 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 51 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 52 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 53 * 54 * Carnegie Mellon requests users of this software to return to 55 * 56 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 57 * School of Computer Science 58 * Carnegie Mellon University 59 * Pittsburgh PA 15213-3890 60 * 61 * any improvements or extensions that they make and grant Carnegie the 62 * rights to redistribute these changes. 63 */ 64 65 #include "stand.h" 66 67 /* 68 * Null filesystem 69 */ 70 int 71 null_open(const char *path, struct open_file *f) 72 { 73 errno = EIO; 74 return -1; 75 } 76 77 int 78 null_close(struct open_file *f) 79 { 80 return 0; 81 } 82 83 int 84 null_read(struct open_file *f, void *buf, size_t size, size_t *resid) 85 { 86 errno = EIO; 87 return -1; 88 } 89 90 int 91 null_write(struct open_file *f, void *buf, size_t size, size_t *resid) 92 { 93 errno = EIO; 94 return -1; 95 } 96 97 off_t 98 null_seek(struct open_file *f, off_t offset, int where) 99 { 100 errno = EIO; 101 return -1; 102 } 103 104 int 105 null_stat(struct open_file *f, struct stat *sb) 106 { 107 errno = EIO; 108 return -1; 109 } 110 111 int 112 null_readdir(struct open_file *f, struct dirent *d) 113 { 114 errno = EIO; 115 return -1; 116 } 117