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. 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 }