lib/libstand/nullfs.c

   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. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  *
  40  *      @(#)open.c      8.1 (Berkeley) 6/11/93
  41  *
  42  *
  43  * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
  44  * All Rights Reserved.
  45  *
  46  * Author: Alessandro Forin
  47  *
  48  * Permission to use, copy, modify and distribute this software and its
  49  * documentation is hereby granted, provided that both the copyright
  50  * notice and this permission notice appear in all copies of the
  51  * software, derivative works or modified versions, and any portions
  52  * thereof, and that both notices appear in supporting documentation.
  53  *
  54  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  55  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  56  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  57  *
  58  * Carnegie Mellon requests users of this software to return to
  59  *
  60  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  61  *  School of Computer Science
  62  *  Carnegie Mellon University
  63  *  Pittsburgh PA 15213-3890
  64  *
  65  * any improvements or extensions that they make and grant Carnegie the
  66  * rights to redistribute these changes.
  67  */
  68
  69 #include "stand.h"
  70
  71 /*
  72  * Null filesystem
  73  */
  74 int
  75 null_open(const char *path, struct open_file *f)
  76 {
  77         errno  = EIO;
  78         return -1;
  79 }
  80
  81 int
  82 null_close(struct open_file *f)
  83 {
  84         return 0;
  85 }
  86
  87 int
  88 null_read(struct open_file *f, void *buf, size_t size, size_t *resid)
  89 {
  90         errno = EIO;
  91         return -1;
  92 }
  93
  94 int
  95 null_write(struct open_file *f, void *buf, size_t size, size_t *resid)
  96 {
  97         errno = EIO;
  98         return -1;
  99 }
 100
 101 off_t
 102 null_seek(struct open_file *f, off_t offset, int where)
 103 {
 104         errno = EIO;
 105         return -1;
 106 }
 107
 108 int
 109 null_stat(struct open_file *f, struct stat *sb)
 110 {
 111         errno = EIO;
 112         return -1;
 113 }
 114
 115 int
 116 null_readdir(struct open_file *f, struct dirent *d)
 117 {
 118         errno = EIO;
 119         return -1;
 120 }