1/* $OpenBSD: nullfs.c,v 1.7 2003/08/11 06:23:09 deraadt Exp $ */ 2/* $NetBSD: open.c,v 1.9 1995/09/19 09:16:52 thorpej Exp $ */ 3 4/*- 5 * Copyright (c) 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * The Mach Operating System project at Carnegie-Mellon University. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)open.c 8.1 (Berkeley) 6/11/93 36 * 37 * 38 * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University 39 * All Rights Reserved. 40 * 41 * Author: Alessandro Forin 42 * 43 * Permission to use, copy, modify and distribute this software and its 44 * documentation is hereby granted, provided that both the copyright 45 * notice and this permission notice appear in all copies of the 46 * software, derivative works or modified versions, and any portions 47 * thereof, and that both notices appear in supporting documentation. 48 * 49 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 50 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 51 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 52 * 53 * Carnegie Mellon requests users of this software to return to 54 * 55 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 56 * School of Computer Science 57 * Carnegie Mellon University 58 * Pittsburgh PA 15213-3890 59 * 60 * any improvements or extensions that they make and grant Carnegie the 61 * rights to redistribute these changes. 62 */ 63 64#include "stand.h" 65 66/* 67 * Null filesystem 68 */ 69int 70null_open(char *path, struct open_file *f) 71{ 72 return EIO; 73} 74 75int 76null_close(struct open_file *f) 77{ 78 return 0; 79} 80 81ssize_t 82null_read(struct open_file *f, void *buf, size_t size, size_t *resid) 83{ 84 return EIO; 85} 86 87ssize_t 88null_write(struct open_file *f, void *buf, size_t size, size_t *resid) 89{ 90 return EIO; 91} 92 93off_t 94null_seek(struct open_file *f, off_t offset, int where) 95{ 96 errno = EIO; 97 return -1; 98} 99 100int 101null_stat(struct open_file *f, struct stat *sb) 102{ 103 return EIO; 104} 105 106#ifndef NO_READDIR 107int 108null_readdir(struct open_file *f, char *name) 109{ 110 return EIO; 111} 112#endif 113